DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
485BPOS, 1996-12-24
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                                                           File Nos. 811-07097
                                                                      33-50379
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                [X]

     Pre-Effective Amendment No.                                       [ ]
   
     Post-Effective Amendment No. 4                                    [X]
    
                                    and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940        [X]
   
     Amendment No. 4                                                   [X]
    

                       (Check appropriate box or boxes.)

                DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
              (Exact Name of Registrant as Specified in Charter)


           c/o The Dreyfus Corporation
           200 Park Avenue, New York, New York          10166
           (Address of Principal Executive Offices)     (Zip Code)


     Registrant's Telephone Number, including Area Code: (212) 922-6000

                             Mark N. Jacobs, Esq.
                                200 Park Avenue
                           New York, New York 10166
                    (Name and Address of Agent for Service)


It is proposed that this filing will become effective (check appropriate box)

           immediately upon filing pursuant to paragraph (b)
     ----
   
      X    on January 1, 1997 pursuant to paragraph (b)
     ----
    
           60 days after filing pursuant to paragraph (a)(i)
     ----
           on     (date)      pursuant to paragraph (a)(i)
     ----
           75 days after filing pursuant to paragraph (a)(ii)
     ----
           on     (date)      pursuant to paragraph (a)(ii) of Rule 485
     ----

If appropriate, check the following box:

           this post-effective amendment designates a new effective date for a
           previously filed post-effective amendment.
     ----

   
        Registrant has registered an indefinite number of shares of its
beneficial interest under the Securities Act of 1933 pursuant to Section 24(f)
of the Investment Company Act of 1940.  Registrant's Rule 24f-2 Notice for the
fiscal year ended September 30, 1996 was filed on November 27, 1996.
    
                DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
                 Cross-Reference Sheet Pursuant to Rule 495(a)

   
Items in
Part A of
Form N-1A      Caption                                       Page
_________      _______                                       ____

   1           Cover Page                                     Cover

   2           Synopsis                                       3

   3           Condensed Financial Information                4

   4           General Description of Registrant              4

   5           Management of the Fund                         5

   5(a)        Management's Discussion of Fund's Performance  *

   6           Capital Stock and Other Securities             11

   7           Purchase of Securities Being Offered           6

   8           Redemption or Repurchase                       8

   9           Pending Legal Proceedings                      *
    
   
Items in
Part B of
Form N-1A
- ---------

   10          Cover Page                                     Cover

   11          Table of Contents                              Cover

   12          General Information and History                B-17

   13          Investment Objectives and Policies             B-2

   14          Management of the Fund                         B-4

   15          Control Persons and Principal                  B-8
               Holders of Securities

   16          Investment Advisory and Other                  B-9
               Services
    
_____________________________________

NOTE:  * Omitted since answer is negative or inapplicable.

                DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
           Cross-Reference Sheet Pursuant to Rule 495(a) (continued)

   
Items in
Part B of
Form N-1A      Caption                                        Page
_________      _______                                        _____

   17          Brokerage Allocation                           B-15

   18          Capital Stock and Other Securities             B-17

   19          Purchase, Redemption and Pricing               B-11
               of Securities Being Offered

   20          Tax Status                                     *

   21          Underwriters                                   B-15

   22          Calculations of Performance Data               B-16

   23          Financial Statements                           B-19
    
   
Items in
Part C of
Form N-1A
_________

   24          Financial Statements and Exhibits              C-1

   25          Persons Controlled by or Under                 C-3
               Common Control with Registrant

   26          Number of Holders of Securities                C-3

   27          Indemnification                                C-3

   28          Business and Other Connections of              C-4
               Investment Adviser

   29          Principal Underwriters                         C-10

   30          Location of Accounts and Records               C-13

   31          Management Services                            C-13

   32          Undertakings                                   C-13

    
_____________________________________

NOTE:  * Omitted since answer is negative or inapplicable.

 
- ------------------------------------------------------------------------------
   

PROSPECTUS                                                     JANUARY 1, 1997
             DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
    

- ------------------------------------------------------------------------------
        DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND (THE "FUND") IS AN
OPEN-END, DIVERSIFIED, MANAGEMENT INVESTMENT COMPANY, KNOWN AS A MUTUAL FUND.
THE FUND'S INVESTMENT OBJECTIVE IS TO PROVIDE INVESTORS WITH A HIGH LEVEL OF
CURRENT INCOME WITH MINIMUM FLUCTUATION OF PRINCIPAL VALUE. THE FUND INVESTS
ONLY IN U.S. TREASURY SECURITIES AND REPURCHASE AGREEMENTS IN RESPECT
THEREOF. UNDER NORMAL CIRCUMSTANCES, THE FUND WILL ENTER INTO REPURCHASE
AGREEMENTS WITH MATURITIES NOT EXCEEDING THE NEXT BUSINESS DAY AND WILL
INVEST IN SECURITIES WITH REMAINING MATURITIES OF THREE YEARS OR LESS, AND
THE DOLLAR-WEIGHTED AVERAGE MATURITY OF THE FUND'S PORTFOLIO IS NOT EXPECTED
TO EXCEED TWO YEARS.
        THE FUND IS DESIGNED FOR INSTITUTIONAL INVESTORS, PARTICULARLY BANKS,
ACTING FOR THEMSELVES OR IN A FIDUCIARY, ADVISORY, AGENCY, CUSTODIAL OR
SIMILAR CAPACITY. FUND SHARES MAY NOT BE PURCHASED DIRECTLY BY INDIVIDUALS,
ALTHOUGH INSTITUTIONS MAY PURCHASE SHARES FOR ACCOUNTS MAINTAINED BY
INDIVIDUALS. SUCH INSTITUTIONS HAVE AGREED TO TRANSMIT COPIES OF THIS
PROSPECTUS TO EACH INDIVIDUAL OR ENTITY FOR WHOSE ACCOUNT THE INSTITUTION
PURCHASES FUND SHARES, TO THE EXTENT REQUIRED BY LAW.
   

        BY THIS PROSPECTUS, THE FUND IS OFFERING INSTITUTIONAL SHARES AND
INVESTOR SHARES. INSTITUTIONAL SHARES AND INVESTOR SHARES ARE IDENTICAL,
EXCEPT AS TO THE SERVICES OFFERED TO AND THE EXPENSES BORNE BY EACH CLASS.
INVESTOR SHARES BEAR CERTAIN COSTS PURSUANT TO A SERVICE PLAN ADOPTED IN
ACCORDANCE WITH RULE 12B-1 UNDER THE INVESTMENT COMPANY ACT OF 1940.
    

        INVESTORS CAN INVEST, REINVEST OR REDEEM SHARES AT ANY TIME WITHOUT
CHARGE OR PENALTY IMPOSED BY THE FUND.
        THE DREYFUS CORPORATION PROFESSIONALLY MANAGES THE FUND'S PORTFOLIO.
          THIS PROSPECTUS SETS FORTH CONCISELY INFORMATION ABOUT THE FUND
THAT AN INVESTOR SHOULD KNOW BEFORE INVESTING. IT SHOULD BE READ AND RETAINED
FOR FUTURE REFERENCE.
   

          THE STATEMENT OF ADDITIONAL INFORMATION, DATED JANUARY 1, 1997,
WHICH MAY BE REVISED FROM TIME TO TIME, PROVIDES A FURTHER DISCUSSION OF
CERTAIN AREAS IN THIS PROSPECTUS AND OTHER MATTERS WHICH MAY BE OF INTEREST
TO SOME INVESTORS. IT HAS BEEN FILED WITH THE SECURITIES AND EXCHANGE
COMMISSION AND IS INCORPORATED HEREIN BY REFERENCE. THE SECURITIES AND
EXCHANGE COMMISSION MAINTAINS A WEB SITE (HTTP://WWW.SEC.GOV) THAT CONTAINS
THE STATEMENT OF ADDITIONAL INFORMATION, MATERIAL INCORPORATED BY REFERENCE,
AND OTHER INFORMATION REGARDING THE FUND. FOR A FREE COPY OF THE STATEMENT OF
ADDITIONAL INFORMATION, WRITE TO THE FUND AT 144 GLENN CURTISS BOULEVARD,
UNIONDALE, NEW YORK 11556-0144, OR CALL 1-800-554-4611. WHEN TELEPHONING, ASK
FOR OPERATOR 144.
    

          MUTUAL FUND SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR
GUARANTEED OR ENDORSED BY, ANY BANK, AND ARE NOT FEDERALLY INSURED BY THE
FEDERAL DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY
OTHER AGENCY. ALL MUTUAL FUND SHARES INVOLVE CERTAIN INVESTMENT RISKS,
INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
- ------------------------------------------------------------------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.
- ------------------------------------------------------------------------------

                                  TABLE OF CONTENTS
   

                                                                          PAGE
Annual Fund Operating Expenses..................................            3
Condensed Financial Information.................................            4
Description of the Fund.........................................            4
Management of the Fund..........................................            5
How to Buy Shares...............................................            6
Investor Services...............................................            7
How to Redeem Shares............................................            8
Service Plan....................................................            9
Shareholder Services Plan.......................................            9
Dividends, Distributions and Taxes..............................           10
Performance Information.........................................           11
General Information.............................................           12
Appendix........................................................           14
    

                                    Page 2
<TABLE>
   



                       ANNUAL FUND OPERATING EXPENSES
               (as a percentage of average daily net assets)

                                                                                             INSTITUTIONAL  INVESTOR
                                                                                                 SHARES      SHARES
                                                                                                --------   ---------
<S>                                             <C>                       <C>          <C>        <C>        <C>
        Management Fees ..........................................................                .20%       .20%
        12b-1 Fees (distribution and servicing)...................................                ._         .25%
        Total Fund Operating Expenses.............................................                .20%       .45%
      Example:
        An investor would pay the following expenses on
        a $1,000 investment, assuming (1) 5%
        annual return and (2) redemption at the
        end of each time period:
                                                                      INSTITUTIONAL  INVESTOR
                                                                          SHARES      SHARES
                                                                        ---------    -------
                                                1 YEAR                     $ 2         $ 5
                                                3 YEARS                    $ 6         $14
                                                5 YEARS                    $11         $25
                                               10 YEARS                    $26         $57
</TABLE>
    



- ------------------------------------------------------------------------------
          THE AMOUNTS LISTED IN THE EXAMPLE SHOULD NOT BE CONSIDERED
REPRESENTATIVE OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY BE GREATER
OR LESS THAN THOSE INDICATED. MOREOVER, WHILE THE EXAMPLE ASSUMES A 5% ANNUAL
RETURN, THE FUND'S ACTUAL PERFORMANCE WILL VARY AND MAY RESULT IN AN ACTUAL
RETURN GREATER OR LESS THAN 5%.
- ------------------------------------------------------------------------------
   

        The purpose of the foregoing table is to assist investors in
understanding the costs and expenses borne by the Fund, the payment of which
will reduce investors' annual return. Unless The Dreyfus Corporation gives
the Fund's investors at least 90 days' notice to the contrary, The Dreyfus
Corporation, and not the Fund, will be liable for Fund expenses (exclusive of
taxes, brokerage, interest on borrowings and (with the prior written consent
of the necessary state securities commissions) extraordinary expenses) other
than the following expenses, which will be borne by the Fund: (i) the
management fee payable by the Fund monthly at the annual rate of .20 of 1% of
the value of the Fund's average daily net assets; and (ii) as to Investor
Shares only, payments made pursuant to the Fund's Service Plan at the annual
rate of .25 of 1% of the value of the Fund's average daily net assets
attributable to Investor Shares. Institutions and certain Service Agents (as
defined below) effecting transactions in Fund shares for the accounts of
their clients may charge their clients direct fees in connection with such
transactions; such fees are not reflected in the foregoing table. See
"Management of the Fund," "How to Buy Shares," "Service Plan" and
"Shareholder Services Plan."
    

                                    Page 3

                        CONDENSED FINANCIAL INFORMATION
        The information in the following table has been audited by Ernst &
Young LLP, the Fund's independent auditors, whose report thereon appears in
the Statement of Additional Information. Further financial data and related
notes are included in the Statement of Additional Information, available upon
request.
                            FINANCIAL HIGHLIGHTS
        Contained below is per share operating performance data for a share
of beneficial interest outstanding, total investment return, ratios to
average net assets and other supplemental data for each year indicated. This
information has been derived from the Fund's financial statements.

<TABLE>
   


                                                                       INSTITUTIONAL SHARES               INVESTOR SHARES
                                                                   -------------------------       ----------------------------
                                                                     YEAR ENDED SEPTEMBER 30          YEAR ENDED SEPTEMBER 30,
                                                                   ----------------------------    ----------------------------
PER SHARE DATA:                                                    1994(1)    1995      1996        1994(1)   1995      1996
                                                                    ------    ------    ------      ------    ------    ------
<S>                                                                 <C>       <C>       <C>         <C>       <C>       <C>
  Net asset value, beginning of year................                $ 2.00    $ 1.96    $ 1.99      $ 2.00    $ 1.97    $ 2.00
                                                                    ------    ------    ------      ------    ------    ------
  INVESTMENT OPERATIONS:
  Investment income--net............................                   .10       .13       .13         .09       .13       .12
  Net realized and unrealized gain (loss) on investments.             (.04)      .03      (.01)       (.03)      .03      (.01)
                                                                    ------    ------    ------      ------    ------    ------
  TOTAL FROM INVESTMENT OPERATIONS..................                   .06       .16       .12         .06       .16       .11
                                                                    ------    ------    ------      ------    ------    ------
  DISTRIBUTIONS:
  Dividends from investment income --net............                  (.10)     (.13)     (.13)       (.09)     (.13)     (.12)
                                                                    ------    ------    ------      ------    ------    ------
  Net asset value, end of year......................                $ 1.96    $ 1.99    $ 1.98      $ 1.97    $ 2.00    $ 1.99
                                                                    ======    ======    ======      ======    ======    ======
  TOTAL INVESTMENT RETURN ..........................               3.08%(2)     8.45%     6.03%    3.39%(2)     8.17%     5.76%
  RATIOS/SUPPLEMENTAL DATA:
  Ratio of expenses to average net assets...........                .20%(2)      .20%      .20%     .45%(2)      .45%      .45%
  Ratio of net investment income to average net assets             5.41%(2)     6.48%     6.40%    5.01%(2)     6.35%     6.13%
  Portfolio Turnover Rate...........................           4,125.54%(3) 1,926.32%  694.24% 4,125.54%(3) 1,926.32%   694.24%
  Net Assets, end of year (000's omitted)...........               $90,421  $160,748   170,290     $23,147    $5,964.  $24,490
_________________________
(1) From October 29, 1993 (commencement of operations) to September 30, 1994.
(2) Annualized.
(3) Not annualized.
</TABLE>
    
   
    


        Further information about the Fund's performance is contained in the
Fund's annual report, which may be obtained without charge by writing to the
address or calling the number set forth on the cover page of this Prospectus.

                            DESCRIPTION OF THE FUND
GENERAL
   

        By this Prospectus, two classes of shares of the Fund are being
offered _ Institutional Shares and Investor Shares (each such class being
referred to as a "Class"). The Classes are identical, except that Investor
Shares are subject to an annual distribution and service fee at the rate of
 .25% of the value of the Fund's average daily net assets attributable to
Investor Shares. The fee is payable for advertising, marketing and
distributing Investor Shares and for ongoing personal services relating to
Investor Class shareholder accounts and services related to the maintenance
of such shareholder accounts pursuant to a Service Plan adopted in accordance
with Rule 12b-1 under the Investment Company Act of 1940, as amended (the
"1940 Act"). See "Service Plan." The distribution and service fee paid by the
Investor Class will cause Investor Shares to have a higher expense ratio and
to pay lower dividends than Institutional Shares.
    

        WHEN USED IN THIS PROSPECTUS AND THE STATEMENT OF ADDITIONAL
INFORMATION, THE TERMS "INVESTOR" AND "SHAREHOLDER" REFER TO THE INSTITUTION
PURCHASING FUND SHARES AND DO NOT REFER TO ANY INDIVIDUAL OR ENTITY FOR WHOSE
ACCOUNT THE INSTITUTION MAY PURCHASE FUND SHARES. Such institutions have
agreed to transmit copies of this Prospectus and all relevant Fund materials,
including proxy materials, to each individual or entity for whose account the
institution purchases Fund shares, to the extent required by law.
                                    Page 4

INVESTMENT OBJECTIVE
        The Fund's investment objective is to provide investors with a high
level of current income with minimum fluctuation of principal value. It
cannot be changed without approval by the holders of a majority (as defined
in the 1940 Act) of the Fund's outstanding voting shares. There can be no
assurance that the Fund's investment objective will be achieved.
MANAGEMENT POLICIES
        The Fund purchases only U.S. Treasury securities, and may enter into
repurchase agreements in respect thereof. Under normal circumstances, the
Fund will enter into repurchase agreements with maturities not exceeding the
next business day and will invest in securities with remaining maturities of
three years or less; the dollar-weighted average maturity of the Fund's
portfolio is not expected to exceed two years. The Fund also may lend
securities from its portfolio and enter into reverse repurchase agreements.
See "Appendix _ Investment Techniques."
INVESTMENT CONSIDERATIONS AND RISKS
        The Fund is not a money market fund and, although it seeks to
maintain minimum fluctuation of principal value, no assurance can be given
that, when an investor desires to redeem Fund shares, the then-current net
asset value per share will be at or greater than the net asset value per
share at the time of purchase.
        The value of the portfolio securities held by the Fund will vary
inversely to changes in prevailing interest rates. Thus, if interest rates
have increased from the time a security was purchased, such security, if
sold, might be sold at a price less than its cost. Similarly, if interest
rates have declined from the time a security was purchased, such security, if
sold, might be sold at a price greater than its purchase cost. In either
instance, if the security was purchased at face value and held to maturity,
no gain or loss would be realized.
        Dividends and distributions paid by the Fund that are attributable to
interest from direct obligations of the United States currently are not
subject to state personal income tax. However, dividends and distributions
attributable to interest from repurchase agreements may be subject to state
tax.
                             MANAGEMENT OF THE FUND
   

INVESTMENT ADVISER -- The Dreyfus Corporation, located at 200 Park Avenue,
New York, New York 10166, was formed in 1947 and serves as the Fund's
investment adviser. The Dreyfus Corporation is a wholly-owned subsidiary of
Mellon Bank, N.A., which is a wholly-owned subsidiary of Mellon Bank
Corporation ("Mellon"). As of November 30, 1996, The Dreyfus Corporation
managed or administered approximately $81 billion in assets for approximately
1.7 million investor accounts nationwide.
    
   

        The Dreyfus Corporation supervises and assists in the overall
management of the Fund's affairs under a Management Agreement with the Fund,
subject to the authority of the Fund's Board in accordance with Massachusetts
law. The Fund's primary portfolio manager is Gerald E. Thunelius. He has held
that position since June 1994 and has been employed by The Dreyfus
Corporation since May 1989. The Fund's other portfolio managers are
identified in the Statement of Additional Information. The Dreyfus Corporation
also provides research services for the Fund and for other funds advised by
The Dreyfus Corporation through a professional staff of portfolio managers
and securities analysts.
    
   

        Mellon is a publicly owned multibank holding company incorporated
under Pennsylvania law in 1971 and registered under the Federal Bank Holding
Company Act of 1956, as amended. Mellon provides a comprehensive range of
financial products and services in domestic and selected international
markets. Mellon is among the twenty-five largest bank holding companies in
the United States based on total assets. Mellon's principal wholly-owned
subsidiaries are Mellon Bank, N.A., Mellon Bank (DE) National Association,
Mellon Bank (MD), The Boston Company, Inc., AFCO Credit Corporation and a
number of companies known as Mellon Financial Services Corporations. Through
its subsidiaries, including The Dreyfus Corporation, Mellon managed more than
$226 billion in assets as of September 30, 1996, including approximately $85
billion in proprietary mutual fund assets. As of September 30, 1996, Mellon,
                                    Page 5

through various subsidiaries, provided non-investment services, such as
custodial or administration services, for more than $905 billion in assets,
including approximately $60 billion in mutual fund assets.
    
   

        For the fiscal year ended September 30, 1996, the Fund paid The
Dreyfus Corporation a monthly management fee at the annual rate of .20 of 1%
of the value of the Fund's average daily net assets.
    
   

        Unless The Dreyfus Corporation gives the Fund's investors at least 90
days' notice to the contrary, The Dreyfus Corporation, and not the Fund, will
be liable for Fund expenses (exclusive of taxes, brokerage, interest on
borrowings and (with the prior written consent of the necessary state
securities commissions) extraordinary expenses) other than the following
expenses which will be borne by the Fund: (i) the management fee payable by
the Fund monthly at the annual rate of .20 of 1% of the Fund's average daily
net assets; and (ii) as to Investor Shares only, payments made pursuant to
the Fund's Service Plan at the annual rate of .25 of 1% of the value of the
Fund's average daily net assets attributable to Investor Shares. See "Service
Plan." The Fund will not reimburse The Dreyfus Corporation for any amounts
The Dreyfus Corporation may bear.
    
   

        In allocating brokerage transactions for the Fund, The Dreyfus
Corporation seeks to obtain the best execution of orders at the most
favorable net price. Subject to this determination, The Dreyfus Corporation
may consider, among other things, the receipt of research services and/or the
sale of shares of the Fund or other funds managed, advised or administered by
The Dreyfus Corporation as factors in the selection of broker-dealers to
execute portfolio transactions for the Fund. See "Portfolio Transactions" in
the Statement of Additional Information.
    

        The Dreyfus Corporation may pay the Fund's distributor for
shareholder services from The Dreyfus Corporation's own assets, including
past profits but not including the management fee paid by the Fund. The
Fund's distributor may use part or all of such payments to pay Service Agents
in respect of these services.
   

DISTRIBUTOR -- The Fund's distributor is Premier Mutual Fund Services, Inc.
(the "Distributor"), located at 60 State Street, Boston, Massachusetts 02109.
The Distributor's ultimate parent is Boston Institutional Group, Inc.
    
   

TRANSFER AND DIVIDEND DISBURSING AGENT AND CUSTODIAN -- Dreyfus Transfer,
Inc., a wholly-owned subsidiary of The Dreyfus Corporation, P.O. Box 9671,
Providence, Rhode Island 02940-9671, is the Fund's Transfer and Dividend
Disbursing Agent (the "Transfer Agent"). Mellon Bank, N.A., One Mellon Bank
Center, Pittsburgh, Pennsylvania 15258, is the Fund's Custodian.
    
   

                                HOW TO BUY SHARES
    

        The Fund is designed for institutional investors, particularly banks,
acting for themselves or in a fiduciary, advisory, agency, custodial or
similar capacity. Fund shares may not be purchased directly by individuals,
although institutions may purchase shares for accounts maintained by
individuals. Generally, each investor will be required to open a single
master account with the Fund for all purposes. In certain cases, the Fund may
request investors to maintain separate master accounts for shares held by the
investor (i) for its own account, for the account of other institutions and
for accounts for which the institution acts as a fiduciary, and (ii) for
accounts for which the investor acts in some other capacity. An institution
may arrange with the Transfer Agent for sub-accounting services and will be
charged directly for the cost of such services.
   

        The minimum initial investment is $10,000,000, unless: (a) the
investor has invested at least $10,000,000 in the aggregate among the Fund,
Dreyfus Cash Management, Dreyfus Cash Management Plus, Inc., Dreyfus
Government Cash Management, Dreyfus Municipal Cash Management Plus, Dreyfus
New York Municipal Cash Management, Dreyfus Tax Exempt Cash Management,
Dreyfus Treasury Cash Management and Dreyfus Treasury Prime Cash Management;
or (b) the investor has, in the opinion of Dreyfus Institutional Services
Division, adequate intent and availability of funds to reach a future level
of investment of $10,000,000 among the funds identified above. There is no
minimum for
                                    Page 6

subsequent purchases. The initial investment must be accompanied by the
Account Application. Share certificates are issued only upon the investor's
written request. No certificates are issued for fractional shares. The Fund
reserves the right to reject any purchase order.
    
   

        Management understands that some financial institutions, securities
dealers and other industry professionals (collectively, "Service Agents") and
other institutions may charge their clients fees in connection with purchases
for the accounts of their clients. These fees would be in addition to any
amounts which might be received under the Service Plan. Service Agents may
receive different levels of compensation for selling different classes of
shares. Investors should consult their Service Agents in this regard.
    
   

        Fund shares may be purchased by wire, by telephone or through
compatible computer facilities. All payments should be made in U.S. dollars
and, to avoid fees and delays, should be drawn only on U.S. banks. For
instructions concerning purchases and to determine whether their computer
facilities are compatible with the Fund's, investors should call Dreyfus
Institutional Services Division at one of the telephone numbers listed under
"General Information."
    

        Fund shares are sold on a continuous basis at the net asset value per
share next determined after an order in proper form and Federal Funds (monies
of member banks in the Federal Reserve System which are held on deposit at a
Federal Reserve Bank) are received by the Transfer Agent or other agent. If
an investor does not remit Federal Funds, its payment must be converted into
Federal Funds. This usually occurs within one business day of receipt of a
bank wire and within two business days of receipt of a check drawn on a
member bank of the Federal Reserve System. Checks drawn on banks which are
not members of the Federal Reserve System may take considerably longer to
convert into Federal Funds. Prior to receipt of Federal Funds, the investor's
money will not be invested.
        The Fund's net asset value per share is determined as of the close of
trading on the floor of the New York Stock Exchange (currently 4:00 p.m., New
York time), on each day that the New York Stock Exchange is open for
business. Net asset value per share of each Class is computed by dividing the
value of the Fund's net assets represented by such Class (i.e., the value of
its assets less liabilities) by the total number of shares of such Class
outstanding. The Fund's investments are valued each business day generally by
using available market quotations or at fair value which may be determined by
one or more pricing services approved by the Fund's Board. Each pricing
service's procedures are reviewed under the general supervision of the Fund's
Board. For further information regarding the methods employed in valuing the
Fund's investments, see "Determination of Net Asset Value" in the Statement
of Additional Information.
   

        Federal Regulations require that an investor provide a certified
Taxpayer Identification Number ("TIN") upon opening or reopening an account.
See "Dividends, Distributions and Taxes" and the  Account Application for
further information concerning this requirement. Failure to furnish a
certified TIN to the Fund could subject an investor to a $50 penalty imposed
by the Internal Revenue Service (the "IRS").
    

                             INVESTOR SERVICES
   

FUND EXCHANGES -- An investor may purchase, in exchange for Institutional
Shares or Investor Shares of the Fund, shares of the same class of Dreyfus
Cash Management, Dreyfus Cash Management Plus, Inc., Dreyfus Government Cash
Management, Dreyfus New York Municipal Cash Management, Dreyfus Municipal
Cash Management Plus, Dreyfus Tax Exempt Cash Management, Dreyfus Treasury
Cash Management, or Dreyfus Treasury Prime Cash Management, which have
different investment objectives that may be of interest to investors. Upon an
exchange into a new account, the following shareholder services and
privileges, as applicable and where available, will be automatically carried
over to the fund into which the exchange is being made: Telephone Exchange
Privilege, Redemption by Wire or Telephone, Redemption Through Compatible
Computer Facilities and the dividend/capital gain distribution option
selected by the investor.
    

                                    Page 7
   


        To request an exchange, instructions must be given to the Distributor
in writing or by telephone. See "How to Redeem Shares _ Procedures." Before
any exchange, the investor must obtain and should review a copy of the
current prospectus of the fund into which the exchange is being made.
Prospectuses may be obtained by calling one of the telephone numbers listed
under "General Information." Shares will be exchanged at the net asset value
next determined after receipt of an exchange request in proper form. No fees
currently are charged investors directly in connection with exchanges,
although the Fund reserves the right, upon not less than 60 days' written
notice, to charge investors a nominal administrative fee in accordance with
rules promulgated by the Securities and Exchange Commission. The Fund
reserves the right to reject any exchange request in whole or in part. The
availability of Fund Exchanges may be modified or terminated at any time upon
notice to investors. See "Dividends, Distributions and Taxes."
    
   

DREYFUS AUTO-EXCHANGE PRIVILEGE -- Dreyfus Auto-Exchange Privilege enables an
investor to invest regularly (on a semi-monthly, quarterly or annual basis),
in exchange for Institutional Shares or Investor Shares of the Fund, in
shares of the same class of Dreyfus Cash Management, Dreyfus Cash Management
Plus, Inc., Dreyfus Government Cash Management, Dreyfus New York Municipal
Cash Management, Dreyfus Municipal Cash Management Plus, Dreyfus Tax Exempt
Cash Management, Dreyfus Treasury Cash Management, or Dreyfus Treasury Prime
Cash Management, if the investor is a shareholder in such fund. The amount an
investor designates, which can be expressed either in terms of a specific
dollar or share amount, will be exchanged automatically on the first and/or
fifteenth day of the month according to the schedule that the investor has
selected. Shares will be exchanged at the then-current net asset value. The
right to exercise this Privilege may be modified or cancelled by the Fund or
the Transfer Agent. An investor may modify or cancel the exercise of this
Privilege at any time by mailing written notification to Dreyfus
Institutional Services Division, EAB Plaza, 144 Glenn Curtiss Boulevard, 8th
Floor, Uniondale, New York 11556-0144. The Fund may charge a service fee for
the use of this Privilege. No such fee currently is contemplated. For more
information concerning this Privilege and the funds eligible to participate
in this Privilege, or to obtain a Dreyfus Auto-Exchange Authorization Form,
please call one of the telephone numbers listed under "General Information."
See "Dividends, Distributions and Taxes."
    
   

                              HOW TO REDEEM SHARES
    

GENERAL
        Investors may request redemption of their shares at any time and the
shares will be redeemed at the next determined net asset value.
        The Fund imposes no charges when shares are redeemed. Service Agents
or other institutions may charge their clients a nominal fee for effecting
redemptions of Fund shares. Any share certificates representing Fund shares
being redeemed must be submitted with the redemption request. The value of
the shares redeemed may be more or less than their original cost, depending
upon the Fund's then-current net asset value.
   

        If a request for redemption is received in proper form by Dreyfus
Institutional Services Division by 4:00 p.m., New York time, the shares will
receive the dividend on the Fund's shares declared on that day and the
proceeds of redemption ordinarily will be transmitted in Federal Funds on the
next business day.
    
   

        The Fund ordinarily will make payment for all shares redeemed within
seven days after receipt by Dreyfus Institutional Services Division of a
redemption request in proper form, except as provided by the rules of the
Securities and Exchange Commission.
    

PROCEDURES
        Investors may redeem shares by wire or telephone, or through
compatible computer facilities as described below.
   

        If an investor selects a telephone redemption privilege or telephone
exchange privilege (which is granted automatically unless the investor
refuses it), the investor authorizes the Transfer Agent to act on telephone
instructions from any person representing himself or herself to be an
authorized representative of
                                    Page 8

the investor, and reasonably believed by the Transfer Agent to be genuine. The
Fund will require the Transfer Agent to employ reasonable procedures, such as
requiring a form of personal identification, to confirm that instructions are
genuine and, if they do not follow such procedures, the Fund or the Transfer
Agent may be liable for any losses due to unauthorized or fraudulent
instructions. Neither the Fund nor the Transfer Agent will be liable for
following telephone instructions reasonably believed to be genuine.
    
   

        During times of drastic economic or market conditions, investors may
experience difficulty in contacting the Transfer Agent by telephone to
request a redemption or exchange of Fund shares. In such cases, investors
should consider using the other redemption procedures described herein.
    
   

REDEMPTION BY WIRE OR TELEPHONE -- Investors may redeem Fund shares by wire
or telephone. The redemption proceeds will be paid by wire transfer.
Investors can redeem shares by telephone by calling one of the telephone
numbers listed under "General Information." The Fund reserves the right to
refuse any request made by wire or telephone and may limit the amount
involved or the number of telephone redemptions. This procedure may be
modified or terminated at any time by the Transfer Agent or the Fund. The
Statement of Additional Information sets forth instructions for redeeming
shares by wire. Shares for which certificates have been issued may not be
redeemed by wire or telephone.
    
   

REDEMPTION THROUGH COMPATIBLE COMPUTER FACILITIES -- The Fund makes available
to institutions the ability to redeem shares through compatible computer
facilities. Investors desiring to redeem shares in this manner should call
Dreyfus Institutional Services Division at one of the telephone numbers
listed under "General Information" to determine whether their computer
facilities are compatible and to receive instructions for redeeming shares in
this manner.
    
   

                                 SERVICE PLAN
                            (INVESTOR SHARES ONLY)
    
   

        The Fund's Investor Shares are subject to a Service Plan adopted
pursuant to Rule 12b-1 under the 1940 Act. Under the Service Plan, the Fund
(a) reimburses the Distributor for distributing Investor Shares and (b) pays
The Dreyfus Corporation, Dreyfus Service Corporation, a wholly-owned
subsidiary of The Dreyfus Corporation, and any affiliate of either of them
(collectively, "Dreyfus") for advertising and marketing Investor Shares and
for providing certain services relating to Investor Shares shareholder
accounts, such as answering shareholder inquiries regarding the Fund and
providing reports and other information, and services related to the
maintenance of such shareholder accounts ("Servicing"), at an aggregate
annual rate of .25 of 1% of the value of the Fund's average daily net assets
attributable to Investor Shares. Each of the Distributor and Dreyfus may pay
one or more Service Agents a fee in respect of the Fund's Investor Shares
owned by shareholders with whom the Service Agent has a Servicing
relationship or for whom the Service Agent is the dealer or holder of record.
Each of the Distributor and Dreyfus determines the amounts, if any, to be
paid to Service Agents under the Service Plan and the basis on which such
payments are made. Generally, Service Agents will provide holders of Investor
Shares a consolidated statement and checkwriting privileges. The fee payable
for Servicing is intended to be a "service fee" as defined under Rule 2830 of
the NASD Conduct Rules. The fees payable under the Service Plan are payable
without regard to actual expenses incurred.
    
   

                          SHAREHOLDER SERVICES PLAN
                         (INSTITUTIONAL SHARES ONLY)
    
   

        The Fund's Institutional Shares are subject to a Shareholder Services
Plan pursuant to which the Fund has agreed to reimburse Dreyfus Service
Corporation an amount not to exceed an annual rate of .25 of 1% of the value
of the Fund's average daily net assets attributable to Institutional Shares
for certain allocated expenses of providing personal services to, and/or
maintaining accounts of, holders of Institutional Shares. The services
provided may include personal services relating to Institutional Shares
shareholder accounts, such as answering shareholder inquiries regarding the
Fund and providing reports
                                    Page 9

and other information, and services related to the maintenance of such
shareholder accounts. The Dreyfus Corporation, and not the Fund, reimburses
Dreyfus Service Corporation for any such allocated expenses with respect to
Institutional Shares pursuant to an undertaking in effect. See "Management of
the Fund."
    

                      DIVIDENDS, DISTRIBUTIONS AND TAXES
   

        The Fund ordinarily declares dividends from net investment income on
each day the New York Stock Exchange is open for business. The Fund's
earnings for Saturdays, Sundays and holidays are declared as dividends on the
next business day. Dividends usually are paid on the last business day of
each month, and are automatically reinvested in additional Fund shares at net
asset value or, at the investor's option, paid in cash. If an investor
redeems all shares in its account at any time during the month, all dividends
to which the investor is entitled will be paid along with the proceeds of the
redemption. An omnibus accountholder may indicate in a partial redemption
request that a portion of any accrued dividends to which such account is
entitled belongs to an underlying accountholder who has redeemed all shares
in his or her account, and such portion of the accrued dividends will be paid
to the accountholder along with the proceeds of the redemption. Distributions
from net realized long-term capital gains, if any, generally are paid once a
year, but the Fund may make such distributions on a more frequent basis to
comply with the distribution requirements of the Internal Revenue Code of
1986, as amended (the "Code"), in all events in a manner consistent with the
provisions of the 1940 Act. The Fund will not make distributions from net
realized securities gains unless capital loss carryovers, if any, have been
utilized or have expired. Investors may choose whether to receive
distributions in cash or to reinvest in additional shares of the Fund at net
asset value. All expenses are accrued daily and deducted before declaration
of dividends to investors. Dividends paid by each Class will be calculated at
the same time and in the same manner and will be in the same amount, except
that the expenses attributable solely to a Class will be borne exclusively by
such Class. Investor Shares will receive lower per share dividends than
Institutional Shares because of the higher expenses borne by Investor Shares.
See "Annual Fund Operating Expenses."
    

        Dividends derived from net investment income, together with
distributions from any net realized short-term securities gains and all or a
portion of any gains realized from the sale or other disposition of certain
market discount bonds, paid by the Fund generally are taxable to U.S.
investors as ordinary income, whether or not reinvested in additional Fund
shares. No dividend paid by the Fund will qualify for the dividends received
deduction allowable to certain U.S. corporations. Distributions from net
realized long-term securities gains, if any, generally are taxable to U.S.
investors as long-term capital gains for Federal income tax purposes,
regardless of how long shareholders have held their shares and whether such
distributions are received in cash or reinvested in additional Fund shares.
The Code provides that the net capital gains of an individual generally will
not be subject to Federal income tax at a rate in excess of 28%. Dividends
and distributions may be subject to state and local taxes.
        Dividends derived from net investment income and distributions
attributable to interest from direct obligations of the United States and
paid by the Fund to a shareholder currently are not subject to state personal
income tax. Dividends and distributions attributable to interest from the
entry into repurchase agreements may be subject to state tax. The Fund will
provide shareholders with a statement which sets forth the percentage of
dividends and distributions paid by the Fund that is attributable to interest
income from direct obligations of the United States.
        Dividends derived from net investment income, together with
distributions from net realized short-term securities gains and all or a
portion of any gains realized from the sale or other disposition of certain
market discount bonds, paid by the Fund with respect to Fund shares
beneficially owned by a foreign investor generally are subject to U.S.
nonresident withholding taxes at the rate of 30%, unless the foreign investor
claims the benefits of a lower rate specified in a tax treaty. Distributions
from net realized long-term securities gains paid by the Fund with respect to
Fund shares beneficially owned by a foreign investor, as well as the proceeds
of any redemptions from such investor's account, regardless of
                                    Page 10

the extent to which gain or loss may be realized, will not be subject to U.S.
nonresident withholding tax. However, such distributions may be subject to
backup withholding, as described below, unless the foreign investor certifies
his non-U.S. residency status.
   
    

        Notice as to the tax status of dividends and distributions will be
mailed to investors annually. Each investor also will receive periodic
summaries of the investor's account which will include information as to
dividends and distributions from securities gains, if any, paid during the
year.
   

        The exchange of shares of one fund for shares of another fund is
treated for Federal income tax purposes as a sale of the shares given in
exchange by the investor and, therefore, an exchanging investor may realize a
taxable gain or loss.
    

        Federal regulations generally require the Fund to withhold ("backup
withholding") and remit to the U.S. Treasury 31% of dividends, distributions
from net realized securities gains and the proceeds of any redemption,
regardless of the extent to which gain or loss may be realized, paid to a
shareholder if such shareholder fails to certify either that the TIN
furnished in connection with opening an account is correct or that such
shareholder has not received notice from the IRS of being subject to backup
withholding as a result of a failure to properly report taxable dividend or
interest income on a Federal income tax return. Furthermore, the IRS may
notify the Fund to institute backup withholding if the IRS determines a
shareholder's TIN is incorrect or if a shareholder has failed to properly
report taxable dividend and interest income on a Federal income tax return.
        A TIN is either the Social Security number or employer identification
number of the record owner of the account. Any tax withheld as a result of
backup withholding does not constitute an additional tax imposed on the
record owner of the account, and may be claimed as a credit on the record
owner's Federal income tax return.
   

        Management of the Fund believes that the Fund has qualified for the
fiscal year ended September 30, 1996 as a "regulated investment company"
under the Code. The Fund intends to continue to so qualify if such
qualification is in the best interests of its shareholders. Such
qualification relieves the Fund of any liability for Federal income tax to
the extent its earnings are distributed in accordance with applicable
provisions of the Code. The Fund is subject to a nondeductible 4% excise tax,
measured with respect to certain undistributed amounts of taxable investment
income and capital gains, if any.
    

        Each investor should consult its tax adviser regarding specific
questions as to Federal, state or local taxes.
                            PERFORMANCE INFORMATION
        For purposes of advertising, performance of each Class of shares may
be calculated on several bases, including current yield, average annual total
return and/or total return.
        Current yield refers to the Fund's annualized net investment income
per share over a 30-day period, expressed as a percentage of the net asset
value per share at the end of the period. For purposes of calculating current
yield, the amount of net investment income per share during that 30-day
period, computed in accordance with regulatory requirements, is compounded by
assuming that it is reinvested at a constant rate over a six-month period. An
identical result is then assumed to have occurred during a second six-month
period which, when added to the result for the first six months, provides an
"annualized" yield for an entire one-year period. Calculations of the Fund's
current yield may reflect absorbed expenses pursuant to any undertaking that
may be in effect. See "Management of the Fund."
        Average annual total return is calculated pursuant to a standardized
formula which assumes that an investment in the Fund was purchased with an
initial payment of $1,000 and that the investment was redeemed at the end of
a stated period of time, after giving effect to the reinvestment of dividends
and distributions during the period. The return is expressed as a percentage
rate which, if applied on a compounded annual basis, would result in the
redeemable value of the investment at the end of the period.
                                    Page 11

Advertisements of the Fund's performance will include the Fund's average
annual total return for one, five and ten year periods, or for shorter time
periods depending upon the length of time the Fund has operated.
        Total return is computed on a per share basis and assumes the
reinvestment of dividends and distributions. Total return generally is
expressed as a percentage rate which is calculated by combining the income
and principal changes for a specified period and dividing by the net asset
value per share at the beginning of the period. Advertisements may include
the percentage rate of total return or may include the value of a
hypothetical investment at the end of the period which assumes the
application of the percentage rate of total return.
        Performance will vary from time to time and past results are not
necessarily representative of future results. Investors should remember that
performance is a function of portfolio management in selecting the type and
quality of portfolio securities and is affected by operating expenses.
Performance information, such as that described above, may not provide a
basis for comparison with other investment companies using a different method
of calculating performance.
   

        Comparative performance information may be used from time to time in
advertising or marketing the Fund's shares, including data from Lipper
Analytical Services, Inc., Morningstar, Inc., Bank Rate Monitortrademark, N.
Palm Beach, Fla. 33408, IBC's Money Fund ReportTM, Bond Buyer's 20-Bond
Index, Moody's Bond Survey Bond Index, Salomon Brothers Broad Investment
Grade Index and other industry publications.
    

                              GENERAL INFORMATION
   

        The Fund was organized as an unincorporated business trust under the
laws of the Commonwealth of Massachusetts pursuant to an Agreement and
Declaration of Trust (the "Trust Agreement") dated March 12, 1992, and
commenced operations on October 29, 1993. The Fund is authorized to issue an
unlimited number of shares of beneficial interest, par value $.001 per share.
The Fund's shares are classified into two classes _ Institutional Shares and
Investor Shares. Each share has one vote and shareholders will vote in the
aggregate and not by class except as otherwise required by law or with
respect to any matter which affects only one class. Holders of Investor
Shares only, however, will be entitled to vote on matters submitted to
shareholders pertaining to the Service Plan.
    

        Under Massachusetts law, shareholders could, under certain
circumstances, be held liable for the obligations of the Fund. However, the
Trust Agreement disclaims shareholder liability for acts or obligations of
the Fund and requires that notice of such disclaimer be given in each
agreement, obligation or instrument entered into or executed by the Fund or a
Trustee. The Trust Agreement provides for indemnification from the Fund's
property for all losses and expenses of any shareholder held liable for the
obligations of the Fund. Thus, the risk of a shareholder's incurring
financial loss on account of shareholder liability is limited to
circumstances in which the Fund itself would be unable to meet its
obligations, a possibility which management believes is remote. Upon payment
of any liability incurred by the Fund, the shareholder paying such liability
will be entitled to reimbursement from the general assets of the Fund. The
Fund intends to conduct its operations in such a way so as to avoid, as far as
 possible, ultimate liability of the shareholders for liabilities of the
Fund. As described under "Management of the Fund" in the Statement of
Additional Information, the Fund ordinarily will not hold shareholder
meetings; however, shareholders under certain circumstances may have the
right to call a meeting of shareholders for the purpose of voting to remove
Trustees.
        The Transfer Agent maintains a record of each investor's ownership
and sends confirmations and statements of account.
        Investor inquiries may be made by writing to the Fund at 144 Glenn
Curtiss Boulevard, Uniondale, New York 11556-0144, or, in the case of
institutional investors, by calling in New York State 1-718-895-1650;
outside New York State call toll free 1-800-346-3621. Individuals or entities
for whom institutions may purchase or redeem Fund shares should call toll
free 1-800-554-4611.
                                    Page 12

   

        The Glass-Steagall Act and other applicable laws prohibit Federally
chartered or supervised banks from engaging in certain aspects of the
business of issuing, underwriting, selling and/or distributing securities.
Accordingly, banks will perform only administrative and shareholder servicing
functions. While the matter is not free from doubt, the Fund's Board members
believe that such laws should not preclude a bank from acting on behalf of
clients as contemplated by this Prospectus. However, judicial or
administrative decisions or interpretations of such laws, as well as changes
in either Federal or state statutes or regulations relating to the
permissible activities of banks and their subsidiaries or affiliates, could
prevent a bank from continuing to perform all or part of the activities
contemplated by this Prospectus. If a bank were prohibited from so acting,
its shareholder clients would be permitted to remain Fund shareholders and
alternative means for continuing the servicing of such shareholders would be
sought. In such event, changes in the operation of the Fund might occur and
shareholders serviced by such bank might no longer be able to avail
themselves of any automatic investment or other services then being provided
by the bank. The Fund does not expect that shareholders would suffer any
adverse financial consequences as a result of any of these occurrences.
    

                                    Page 13

                                    APPENDIX
INVESTMENT TECHNIQUES
   

BORROWING MONEY -- The Fund is permitted to borrow to the extent permitted
under the 1940 Act, which permits an investment company to borrow in an
amount up to 331\3% of the value of its total assets. The Fund currently
intends to borrow money only for temporary or emergency (not leveraging)
purposes, in an amount up to 15% of the value of its total assets (including
the amount borrowed) valued at the lesser of cost or market, less liabilities
(not including the amount borrowed) at the time the borrowing is made. While
borrowings exceed 5% of the Fund's total assets, the Fund will not make any
additional investments. In addition, the Fund may borrow for investment
purposes on a secured basis through entering into reverse repurchase
agreements as described below.
    
   

REVERSE REPURCHASE AGREEMENTS -- The Fund may enter into reverse repurchase
agreements with banks, brokers or dealers. Reverse repurchase agreements
involve the transfer by the Fund of an underlying debt instrument in return
for cash proceeds based on a percentage of the value of the security. The
Fund retains the right to receive interest and principal payments on the
security. At an agreed upon future date, the Fund repurchases the security at
principal plus accrued interest. As a result of these transactions, the Fund
is exposed to greater potential fluctuations in the value of its assets and
its net asset value per share. These borrowings will be subject to interest
costs which may or may not be recovered by appreciation of the securities
purchased; in certain cases, interest costs may exceed the return received on
the securities purchased.
    
   

LENDING PORTFOLIO SECURITIES -- The Fund may lend securities from its
portfolio to brokers, dealers and other financial institutions needing to
borrow securities to complete certain transactions. The Fund continues to be
entitled to payments in amounts equal to the interest or other distributions
payable on the loaned securities which affords the Fund an opportunity to
earn interest on the amount of the loan and on the loaned securities'
collateral. Loans of portfolio securities may not exceed 331\3% of the value
of the Fund's total assets, and the Fund will receive collateral consisting
of cash or U.S. Government securities which will be maintained at all times
in an amount equal to at least 100% of the current market value of the loaned
securities. Such loans are terminable by the Fund at any time upon specified
notice. The Fund might experience risk of loss if the institution with which
it has engaged in a portfolio loan transaction breaches its agreement with
the Fund.
    

WHEN-ISSUED SECURITIES -- U.S. Treasury securities purchased by the Fund
frequently are offered on a when-issued basis, which means that the price is
fixed at the time of commitment, but delivery and payment ordinarily take
place a number of days after the date of commitment to purchase. The Fund
will commit to purchase such securities only with the intention of actually
acquiring the securities, but the Fund may sell these securities before the
settlement date if it is deemed advisable. The Fund will not accrue income in
respect of a security purchased on a when-issued basis prior to its stated
delivery date.
   
    

CERTAIN PORTFOLIO SECURITIES
U.S. TREASURY SECURITIES -- U.S. Treasury securities differ in their interest
rates, maturities and times of issuance. Treasury Bills have initial
maturities of one year or less; Treasury Notes have initial maturities of one
to ten years; and Treasury Bonds generally have initial maturities greater
than ten years.
   

REPURCHASE AGREEMENTS -- In a repurchase agreement, the Fund buys, and the
seller agrees to repurchase, a security at a mutually agreed upon time and
price. The repurchase agreement thereby determines the yield during the
purchaser's holding period, while the seller's obligation to repurchase is
secured by the value of the underlying security. The Fund intends to enter
into only repurchase agreements with maturities not exceeding the next
business day. Repurchase agreements could involve risks in the event of a
default or insolvency of the other party to the agreement, including possible
delays or restrictions upon the Fund's ability to dispose of the underlying
securities. The Fund may enter into repurchase agreements with certain banks
or non-bank dealers.
    

                                    Page 14
        NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS AND IN THE
FUND'S OFFICIAL SALES LITERATURE IN CONNECTION WITH THE OFFER OF THE FUND'S
SHARES, AND, IF GIVEN OR MADE, SUCH OTHER INFORMATION OR REPRESENTATIONS MUST
NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND. THIS PROSPECTUS
DOES NOT CONSTITUTE AN OFFER IN ANY STATE IN WHICH, OR TO ANY PERSON TO WHOM,
SUCH OFFERING MAY NOT LAWFULLY BE MADE.
                                    Page 15

PROSPECTUS
INSTITUTIONAL
SHORT TERM
TREASURY FUND





Copy Rights 1997 Dreyfus Service Corporation
                                      721/680p010197
                                    Page 16





               DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
                      INSTITUTIONAL AND INVESTOR SHARES
                                   PART B
                    (STATEMENT OF ADDITIONAL INFORMATION)
   
                               JANUARY 1, 1997
    
   

     This Statement of Additional Information, which is not a prospectus,
supplements and should be read in conjunction with the current Prospectus
of Dreyfus Institutional Short Term Treasury Fund (the "Fund"), dated
January 1, 1997, as it may be revised from time to time.  To obtain a copy
of the Fund's Prospectus, please write to the Fund at 144 Glenn Curtiss
Boulevard, Uniondale, New York 11556-0144, or, in the case of institutional
investors, call the following numbers:
    
                In New York State -- Call 1-718-895-1650
                Outside New York State -- Call Toll Free 1-800-346-3621

     Individuals or entities for whom institutions may purchase or redeem
Fund shares may write to the Fund at the above address or call toll free 1-
800-554-4611 to obtain a copy of the Fund's Prospectus.

     The Dreyfus Corporation (the "Manager") serves as the Fund's
investment adviser.

     Premier Mutual Fund Services, Inc. (the "Distributor") is the
distributor of the Fund's shares.

                              TABLE OF CONTENTS


                                                           Page
   
Investment Objective and Management Policies. . . . . . .   B-2
Management of the Fund. . . . . . . . . . . . . . . . . .   B-4
Management Agreement. . . . . . . . . . . . . . . . . . .   B-9
Purchase of Shares. . . . . . . . . . . . . . . . . . . .   B-11
Service Plan (Investor Shares). . . . . . . . . . . . . .   B-11
Shareholder Services Plan (Institutional Shares). . . . .   B-12
Redemption of Shares. . . . . . . . . . . . . . . . . . .   B-13
Determination of Net Asset Value. . . . . . . . . . . . .   B-14
Dividends, Distributions and Taxes. . . . . . . . . . . .   B-14
Portfolio Transactions. . . . . . . . . . . . . . . . . .   B-15
Investor Services . . . . . . . . . . . . . . . . . . . .   B-15
Performance Information . . . . . . . . . . . . . . . . .   B-16
Information About the Fund. . . . . . . . . . . . . . . .   B-17
Transfer and Dividend Disbursing Agent, Custodian,
  Counsel and Independent Auditors. . . . . . . . . . . .   B-17
Financial Statements. . . . . . . . . . . . . . . . . . .   B-19
Report of Independent Auditors. . . . . . . . . . . . . .   B-26
    
            INVESTMENT OBJECTIVE AND MANAGEMENT POLICIES


     The following information supplements and should be read in
conjunction with the sections in the Fund's Prospectus entitled
"Description of the Fund" and "Appendix."

Management Policies

     Repurchase Agreements.  The Fund's custodian or sub-custodian will
have custody of, and will hold in a segregated account, securities acquired
by the Fund under a repurchase agreement.  Repurchase agreements are
considered by the staff of the Securities and Exchange Commission to be
loans by the Fund.  In an attempt to reduce the risk of incurring a loss on
a repurchase agreement, the Fund will enter into repurchase agreements only
with domestic banks with total assets in excess of $1 billion, or primary
government securities dealers reporting to the Federal Reserve Bank of New
York, with respect to securities of the type in which the Fund may invest,
and will require that additional securities be deposited with it if the
value of the securities purchased should decrease below the resale price.

     Lending Portfolio Securities.  In connection with its securities
lending transactions, the Fund may return to the borrower or a third party
which is unaffiliated with the Fund, and which is acting as a "placing
broker," a part of the interest earned from the investment of collateral
received for securities loaned.
   
     The Securities and Exchange Commission currently requires that the
following conditions must be met whenever portfolio securities are loaned:
(1) the Fund must receive at least 100% cash collateral from the borrower;
(2) the borrower must increase such collateral whenever the market value of
the securities rises above the level of such collateral; (3) the Fund must
be able to terminate the loan at any time; (4) the Fund must receive
reasonable interest on the loan, as well as any interest or other
distributions payable on the loaned securities, and any increase in market
value; and (5) the Fund may pay only reasonable custodian fees in
connection with the loan.
    
   
     When-Issued Securities.  U.S. Treasury securities purchased on a when-
issued basis and other U.S. Treasury securities held by the Fund are
subject to changes in value (both generally changing in the same way, i.e.,
appreciating when interest rates decline and depreciating when interest
rates rise) based upon changes, real or anticipated, in the level of
interest rates.  U.S. Treasury securities purchased on a when-issued basis
may expose the Fund to risk because they may experience such fluctuations
prior to their actual delivery.  Purchasing U.S. Treasury securities on a
when-issued basis can involve the additional risk that the yield available
in the market when the delivery takes place actually may be higher than
that obtained in the transaction itself.  A segregated account of the Fund
consisting of permissible liquid assets at least equal at all times to the
amount of the when-issued commitments will be established and maintained at
the Fund's custodian bank.  Purchasing U.S. Treasury securities on a when-
issued basis when the Fund is fully or almost fully invested may result in
greater potential fluctuation in the value of the Fund's net assets and its
net asset value per share.
    
Investment Restrictions

     The Fund has adopted investment restrictions numbered 1 through 8 as
fundamental policies, which cannot be changed without approval by the
holders of a majority (as defined in the Investment Company Act of 1940, as
amended (the "1940 Act")) of the Fund's outstanding voting shares.
Investment restrictions numbered 9 through 12 are not fundamental policies
and may be changed by vote of a majority of the Fund's Board members at any
time.  The Fund may not:

     1.  Invest in commodities, except that the Fund may purchase and sell
options, forward contracts, futures contracts, including those relating to
indices, and options on futures contracts or indices.

     2.  Purchase, hold or deal in real estate, real estate limited
partnership interests, or oil, gas or other mineral leases or exploration
or development programs, but the Fund may purchase and sell securities that
are secured by real estate and may purchase and sell securities issued by
companies that invest or deal in real estate.

     3.  Borrow money, except to the extent permitted under the 1940 Act
(which currently limits borrowing to no more than 33-1/3% of the value of
the Fund's total assets).  For purposes of this investment restriction, the
entry into options, forward contracts, futures contracts, including those
relating to indices, and options on futures contracts or indices shall not
constitute borrowing.

     4.  Make loans to others, except through the purchase of debt
obligations and the entry into repurchase agreements.  However, the Fund
may lend its portfolio securities in an amount not to exceed 33-1/3% of the
value of its total assets.  Any loans of portfolio securities will be made
according to guidelines established by the Securities and Exchange
Commission and the Fund's Board.

     5.  Act as an underwriter of securities of other issuers, except to
the extent the Fund may be deemed an underwriter under the Securities Act
of 1933, as amended, by virtue of disposing of portfolio securities.

     6.  Invest more than 25% of its assets in the securities of issuers in
any single industry, provided that there shall be no limitation on the
purchase of obligations issued or guaranteed by the U.S. Government, its
agencies or instrumentalities.

     7.  Issue any senior security (as such term is defined in Section
18(f) of the 1940 Act), except to the extent the activities permitted in
Investment Restrictions Nos. 1, 3 and 9 may be deemed to give rise to a
senior security.

     8.  Purchase securities on margin, but the Fund may make margin
deposits in connection with transactions in options, forward contracts,
futures contracts, including those related to indices, and options on
futures contracts or indices.

     9.  Pledge, mortgage or hypothecate its assets, except to the extent
necessary to secure permitted borrowings and to the extent related to the
deposit of assets in escrow in connection with writing covered put and call
options and the purchase of securities on a when-issued or delayed-delivery
basis and collateral and initial or variation margin arrangements with
respect to options, forward contracts, futures contracts, including those
related to indices, and options on futures contracts or indices.

     10.  Purchase, sell or write puts, calls or combinations thereof.

     11.  Enter into repurchase agreements providing for settlement in more
than seven days after notice or purchase securities which are illiquid, if,
in the aggregate, more than 15% of the value of the Fund's net assets would
be so invested.

     12.  Purchase securities of other investment companies, except to the
extent permitted under the 1940 Act.

     If a percentage restriction is adhered to at the time of investment, a
later increase or decrease in percentage resulting from a change in values
of assets will not constitute a violation of such restriction.

     The Fund may make commitments more restrictive than the restrictions
listed above so as to permit the sale of Fund shares in certain states.
Should the Fund determine that a commitment is no longer in the best
interest of the Fund and its shareholders, the Fund reserves the right to
revoke the commitment by terminating the sale of Fund shares in the state
involved.


                           MANAGEMENT OF THE FUND

     Board members and officers of the Fund, together with information as
to their principal business occupations during at least the last five
years, are shown below.  Each Board member who is deemed to be an
"interested person" of the Fund, as defined in the 1940 Act, is indicated
by an asterisk.

Board Members of the Fund

LUCY WILSON BENSON, Board Member.  President of Benson and Associates,
      consultants to business and government.  Mrs. Benson is a director of
      Communications Satellite Corporation, General RE Corporation and
      Logistics Management Institute.  She is also a Trustee of the Alfred
      P. Sloan Foundation, Vice Chairman of the Board of Trustees of
      Lafayette College, Vice Chairman of the Citizens Network for Foreign
      Affairs and a member of the Council on Foreign Relations.  From 1980
      to 1994, Mrs. Benson was a director of the Grumman Corporation.  Mrs.
      Benson served as a consultant to the U.S. Department of State and to
      SRI International from 1980 to 1981.  From 1977 to 1980, she was
      Under Secretary of State of Security Assistance, Science and
      Technology.  She is 68 years old and her address is 46 Sunset Avenue,
      Amherst, Massachusetts 01002.
   
*DAVID W. BURKE, Board Member.  Chairman of the Broadcasting Board of
      Governors, an independent board within the United States Information
      Agency, since August 1995.  From August 1994 to December 1994, Mr.
      Burke was a Consultant to the Manager and, from October 1990 to
      August 1994, he was Vice President and Chief Administrative Officer
      of the Manager.  From 1977 to 1990, Mr. Burke was involved in the
      management of national television news, as Vice President and
      Executive Vice President of ABC News, and subsequently as President
      of CBS News.  He is 59 years old and his address is Box 654, Eastham,
      Massachusetts 02642.
    
   
*JOSEPH S. DiMARTINO, Chairman of the Board.  Since January 1995, Chairman
      of the Board of various funds in the Dreyfus Family of Funds.  He is
      also Chairman of the Board of Directors of Noel Group, Inc., a
      venture capital company; and a director of The Muscular Dystrophy
      Association, HealthPlan Services Corporation, Belding Heminway
      Company, Inc., a manufacturer and marketer of industrial threads,
      specialty yarns, home furnishings and fabrics, Curtis Industries,
      Inc., a national distributor of security products, chemicals and
      automotive and other hardware, and Staffing Resources, Inc.  For more
      than five years prior to January 1995, he was President, a director
      and, until August 1994, Chief Operating Officer of the Manager and
      Executive Vice President and a director of Dreyfus Service
      Corporation, a wholly-owned subsidiary of the Manager and, until
      August 24, 1994, the Fund's distributor.  From August 1994 until
      December 31, 1994, he was a director of Mellon Bank Corporation.  He
      is 52 years old and his address is c/o Noel Group, Inc., 667 Madison
      Avenue, 25th Floor, New York, New York 10022.
    
   
MARTIN D. FIFE, Board Member.  Chairman of the Board of Magar, Inc., a
      company specializing in financial products and developing early stage
      companies, since November 1987.  Mr. Fife is also Chairman of the
      Board and Chief Executive Officer of Skysat Communications Network
      Corporation, a company developing telecommunications systems.  From
      1960 to 1994, Mr. Fife was President of Fife Associates, Inc.  He
      also serves on the boards of various other companies.  He is 68 years
      old and his address is 405 Lexington Avenue, New York, New York
      10174.
    
WHITNEY I. GERARD, Board Member.  Partner of the New York City law firm of
      Chadbourne & Parke.  He is 61 years old and his address is 30
      Rockefeller Plaza, New York, New York 10112.
   
ROBERT R. GLAUBER, Board Member.  Research Fellow, Center for Business and
      Government at the John F. Kennedy School of Government, Harvard
      University, since January 1992.  Mr. Glauber was Under Secretary of
      the Treasury for Finance at the U.S. Treasury Department from May
      1989 to January 1992.  For more than five years prior thereto, he was
      a Professor of Finance at the Graduate School of Business
      Administration of Harvard University and, from 1985 to 1989, Chairman
      of its Advanced Management Program.  He is a director of Mid Ocean
      Reinsurance Co. Ltd. Cooke & Bieler, Inc., investment counselors,
      NASD Regulation Inc., and the Federal Reserve Bank of Boston.  He is
      56 years old and his address is 79 John F. Kennedy Street, Cambridge,
      Massachusetts 02138.
    
   
ARTHUR A. HARTMAN, Board Member.  Senior consultant with APCO Associates
      Inc.  From 1981 to 1987, he was United States Ambassador to the
      former Soviet Union.  He is a director of the Hartford Insurance
      Group and a member of the advisory councils of several other
      companies, research institutes and foundations.  He is Chairman of
      First NIS Regional Funds (ING Barings Management) and former
      President of the Harvard Board of Overseers.  He is 69 years old and
      his address is 2738 McKinley Street, N.W., Washington, D.C. 20015.
    
   
GEORGE L. PERRY, Board Member.  An economist and Senior Fellow at the
      Brookings Institution since 1969.  He is co-director of the Brookings
      panel on Economic Activity and editor of its journal, The Brookings
      Papers.  He is also a director of the State Farm Mutual Automobile
      Association and State Farm Life Insurance Company.  He is 61 years
      old and his address is 1775 Massachusetts Avenue, N.W., Washington,
      D.C. 20036.
    
PAUL D. WOLFOWITZ, Board Member.  Dean of The Paul H. Nitze School of
      Advanced International Studies at Johns Hopkins University.  From
      1989 to 1993, he was Under Secretary of Defense for Policy.  From
      1986 to 1989, he was the U.S. Ambassador to the Republic of
      Indonesia.  From 1982 to 1986, he was Assistant Secretary of State of
      East Asian and Pacific Affairs of the Department of State.  He is 51
      years old and his address is 1740 Massachusetts Avenue, N.W.,
      Washington, D.C.  20036.

     For so long as the Fund's plans described in the sections captioned
"Service Plan" and "Shareholder Services Plan" remain in effect, the Board
members of the Fund who are not "interested persons" of the Fund, as
defined in the 1940 Act, will be selected and nominated by the Board
members who are not "interested persons" of the Fund.

     Ordinarily, there will be no meetings of shareholders for the purpose
of electing Board members unless and until such time as less than a
majority of the Board members holding office have been elected by
shareholders, at which time the Board members then in office will call a
shareholders' meeting for the election of Board members.  Under the 1940
Act, shareholders of record of not less than two-thirds of the outstanding
shares of the Fund may remove a Board member through a declaration in
writing or by vote cast in person or by proxy at a meeting called for that
purpose.  The Board is required to call a meeting of shareholders for the
purpose of voting upon the question of removal of any Board member when
requested in writing to do so by the shareholders of record of not less
than 10% of the Fund's outstanding shares.
   
     Board members are entitled to receive an annual retainer and a per
meeting fee and reimbursement for their expenses.  The Chairman of the
Board receives an additional 25% of such compensation.  Emeritus Board
members are entitled to receive an annual retainer and a per meeting fee of
one-half the amount paid to them as Board members.  The aggregate amount of
compensation paid to each Board member by the Fund for the fiscal year
ended September 30, 1996, and by all other funds in the Dreyfus Family of
Funds for which such person is a Board member (the number of which is set
forth in parenthesis next to each Board member's total compensation) for
the year ended December 31, 1995, were as follows:

    
   


                                                      Total Compensation
                                   Aggregate         from Fund(2) and Fund
  Name of Board                Compensation from       Complex Paid to
      Member                        Fund(1)(2)          Board Members

Lucy Wilson Benson                  $2,250              $ 72,003 (14)

David W. Burke                      $2,250              $253,654 (52)

Joseph S. DiMartino                 $2,813              $448,618 (93)

Martin D. Fife                      $2,250              $ 59,253 (12)

Whitney I. Gerard                   $2,250              $ 59,503 (12)

Robert R. Glauber                   $2,250              $ 97,503 (10)

Arthur A. Hartman                   $2,250              $ 59,503 (12)

George L. Perry                     $2,250              $ 59,503 (12)

Paul D. Wolfowitz                   $2,000              $ 49,503 (11)
    
   
______________________________
(1)  Amount does not include reimbursed expenses for attending Board meetings,
     which amounted to $981 for all Board members as a group.
    
(2)  The aggregate compensation payable to each Board member by the Fund was
     paid by the Manager and not the Fund.
   
    
   
    
Officers of the Fund
   
MARIE E. CONNOLLY, President and Treasurer.  President, Chief Executive
      Officer and a director of the Distributor and an officer of other
      investment companies advised or administered by the Manager.  From
      December 1991 to July 1994, she was President and Chief Compliance
      Officer of Funds Distributor, Inc., the ultimate parent of which is
      Boston Institutional Group, Inc.  Prior to December 1991, she served
      as Vice President and Controller, and later as Senior Vice President,
      of The Boston Company Advisors, Inc.  She is 39 years old.
    
   
JOHN E. PELLETIER, Vice President and Secretary.  Senior Vice President and
      General Counsel of the Distributor and an officer of other investment
      companies advised or administered by the Manager.  From February 1992
      to July 1994, he served as Counsel for The Boston Company Advisors,
      Inc.  From August 1990 to February 1992, he was employed as an
      Associate at Ropes & Gray.  He is 32 years old.
    
   
ELIZABETH A. BACHMAN, Vice President and Assistant Secretary.  Assistant
      Vice President of the Distributor and an officer of other investment
      companies advised or administered by the Manager.  She is 27 years
      old.
    
   
RICHARD W. INGRAM, Vice President and Assistant Treasurer.  Senior Vice
      President and Director of Client Services and Treasury Operations of
      Funds Distributor, Inc. and an officer of other investment companies
      advised or administered by the Manager.  From March 1994 to November
      1995, he was Vice President and Division Manager for First Data
      Investor Services Group.  From 1989 to 1994, he was Vice President,
      Assistant Treasurer and Tax Director - Mutual Funds of The Boston
      Company, Inc.  He is 40 years old.
    
   
MARY A. NELSON, Vice President and Assistant Treasurer.  Vice President and
      Manager of Treasury Services and Administration of Funds Distributor,
      Inc. and an officer of other investment companies advised or
      administered by the Manager.  From September 1989 to July 1994, she
      was an Assistant Vice President and Client Manager for The Boston
      Company, Inc.  She is 32 years old.
    
   
JOSEPH F. TOWER, III, Vice President and Assistant Treasurer.  Senior Vice
      President, Treasurer and Chief Financial Officer of the Distributor
      and an officer of other investment companies advised or administered
      by the Manager.  From July 1988 to August 1994, he was employed by
      The Boston Company, Inc., where he held various management positions
      in the Corporate Finance and Treasury areas.  He is 34 years old.
    
   
DOUGLAS C. CONROY, Vice President and Assistant Secretary.  Supervisor of
      Treasury Services and Administration of Funds Distributor, Inc. and
      an officer of other investment companies advised or administered by
      the Manager.  From April 1993 to January 1995, he was a Senior Fund
      Accountant for Investors Bank and Trust Company.  From December 1991
      to March 1993, he was employed as a Fund Accountant at The Boston
      Company, Inc.  He is 27 years old.
    
   
MARK A. KARPE, Vice President and Assistant Secretary.  Senior Paralegal of
      the Distributor and an officer of other investment companies advised
      or administered by the Manager.  Prior to September 1993, Mr. Karpe
      was employed as an Associate Examiner in the Enforcement Department
      of the National Association of Securities Dealers, Inc.  He is 27
      years old.
    
     The address of each officer of the Fund is 200 Park Avenue, New York,
New York, 10166.

     The Fund's Board members and officers, as a group, owned less than 1%
of the Fund's shares outstanding on December 2, 1996.
   
     The following persons are known by the Fund to own of record 5% or
more of the Fund's outstanding voting securities as of December 2, 1996:
Institutional Shares - Swiss American Securities Inc./Sub A/C # 11657110,
100 Wall St., New York, NY 10005-3701 - 15.3134%; General Invested
Fund/City of Detroit, Finance Department/Debt Management, 1210 City County
Bldg., Detroit, MI 48226 - 13.1935%; City of Detroit/Water Bond Fund Series
1995, City of Detroit Finance Department/Debt Management, 1210 City County
Bldg. Detroit, MI 48226 - 10.1097%; C F Industries Inc., 1 Salem Lake Dr.,
Long Grove, IL 60047-8401 - 9.3728%; Sun Bank TTEE/FBO Highland Health
Facilities Auth., Attn. Linda Schuchman, 225 E. Robinson St., Suite 250,
Orlando, FL 32801-4322 - 9.3726%; City of Detroit/Sewage Disposal System
Improvement and Extension Finance Department/Debt Management, 1210 City
County Bldg., Detroit, MI 48201 - 6.8145%; Investor Shares - Capital
Network Services, Attn. Donna Howell, 1 Bush St. Suite 11, San Francisco,
CA 94104-4425 - 30.1707%; Sunbank, N.A., Attn. Mel Hamilton, 200 S. Orange
Ave., 10th Fl., Orlando, FL 32801-3410 - 15.4181%; Crestar Bank, Attn.
Donna Leary HDQ3204, 11 S. 10th St., Richmond, VA 23219-4001 - 11.3460%;
DDL Omni Engineering Corp., Attn. B. Jeffrey Morrison, 8260 Greensboro Dr.,
Suite 600, McLean, VA 22102 - 9.5245%; MACF, Inc., Attn. Michael R. Dorsey,
The Hurt Building, Suite 449, Atlanta, GA 30303 - 5.4690%.  A shareholder
who beneficially owns, directly or indirectly, more than 25% of the Fund's
voting securities may be deemed a "control person" (as defined in the 1940
Act) of the Fund.
    

                            MANAGEMENT AGREEMENT

     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "Management
of the Fund."
   
     The Manager provides management services pursuant to the Management
Agreement (the "Agreement") dated August 24, 1994 with the Fund, which is
subject to annual approval by (i) the Fund's Board or (ii) vote of a
majority (as defined in the 1940 Act) of the outstanding voting securities
of the Fund, provided that in either event the continuance also is approved
by a majority of the Board members who are not "interested persons" (as
defined in the 1940 Act) of the Fund or the Manager, by vote cast in person
at a meeting called for the purpose of voting on such approval.  The
Agreement was approved by shareholders on August 4, 1994, and was last
approved by the Fund's Board, including a majority of the Board members who
are not "interested persons" of any party to the Agreement, at a meeting
held on February 1, 1996.  The Agreement is terminable without penalty, on
60 days' notice, by the Fund's Board or by vote of the holders of a
majority of the Fund's shares, or, on not less than 90 days' notice, by the
Manager.  The Agreement will terminate automatically in the event of its
assignment (as defined in the 1940 Act).
    
   
     The following persons are officers and/or directors of the Manager:
W. Keith Smith, Chairman of the Board; Christopher M. Condron, President,
Chief Executive Officer, Chief Operating Officer and a director; Stephen E.
Canter, Vice Chairman, Chief Investment Officer and a director; Lawrence S.
Kash, Vice Chairman--Distribution and a director; Philip L. Toia, Vice
Chairman--Operations and Administration and a director; William T.
Sandalls, Jr., Senior Vice President and Chief Financial Officer; William
F. Glavin, Jr., Vice President--Corporate Development; Mark N. Jacobs, Vice
President, General Counsel and Secretary; Patrice M. Kozlowski, Vice
President--Corporate Communications; Mary Beth Leibig, Vice President--
Human Resources; Jeffrey N. Nachman, Vice President--Mutual Fund
Accounting; Andrew S. Wasser, Vice President--Information Services; Elvira
Oslapas, Assistant Secretary; and Mandell L. Berman, Frank V. Cahouet and
Alvin E. Friedman, directors.
    
     The Manager manages the Fund's portfolio of investments in accordance
with the stated policies of the Fund, subject to the approval of the Fund's
Board.  The Manager is responsible for investment decisions, and provides
the Fund with portfolio managers who are authorized by the Board to execute
purchases and sales of securities.  The Fund's portfolio managers are
Robert P. Fort, Garitt Kono and Gerald E. Thunelius.  The Manager also
maintains a research department with a professional staff of portfolio
managers and securities analysts who provide research services for the Fund
as well as for other funds advised by the Manager.  All purchases and sales
are reported for the Board members' review at the meeting subsequent to
such transactions.

     The Manager maintains office facilities on behalf of the Fund, and
furnishes, among other things, statistical and research data, clerical
help, accounting, data processing, bookkeeping and internal auditing and
certain other required services to the Fund.  The Manager also may make
such advertising and promotional expenditures, using its own resources, as
it from time to time deems appropriate.
   
     As compensation for the Manager's services, the Fund has agreed to pay
the Manager a monthly management fee at the annual rate of .20 of 1% of
value of the Fund's average daily net assets.  For the period October 29,
1993 (commencement of operations) through September 30, 1994, and for the
fiscal years ended September 30, 1995 and 1996, the management fees paid by
the Fund amounted to $119,741, $186,965 and $468,699, respectively.
    
   
     Unless the Manager gives the Fund's investors at least 90 days' notice
to the contrary, the Manager, and not the Fund, will be liable for Fund
expenses (exclusive of taxes, brokerage, interest on borrowings and (with
the prior written consent of the necessary state securities commissions)
extraordinary expenses) other than the following expenses, which will be
borne by the Fund:  (i) the management fee payable by the Fund monthly at
the annual rate of .20 of 1% of the Fund's average daily net assets and
(ii) as to Investor Shares only, payments made pursuant to the Fund's
Service Plan at the annual rate of .25 of 1% of the value of the Fund's
average daily net assets attributable to Investor Shares.  See "Service
Plan."
    
     In addition, the Manager has agreed that if in any fiscal year the
aggregate expenses of the Fund, exclusive of taxes, brokerage, interest on
borrowings and (with the prior written consent of the necessary state
securities commissions) extraordinary expenses, but including the
management fee, exceed the expense limitation of any state having
jurisdiction over the Fund, the Fund may deduct from the payment to be made
to the Manager under the Agreement, or the Manager will bear, such excess
expense to the extent required by state law.  Such deduction or payment, if
any, will be estimated daily, and reconciled and effected or paid, as the
case may be, on a monthly basis.

     The aggregate of the fees payable to the Manager is not subject to
reduction as the value of the Fund's net assets increases.

   
                             PURCHASE OF SHARES
    
   
     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "How to Buy
Shares."
    
   
     The Distributor.  The Distributor serves as the Fund's distributor on
a best efforts basis pursuant to an agreement which is renewable annually.
The Distributor also acts as distributor for the other funds in the Dreyfus
Family of Funds and for certain other investment companies.  In some
states, certain financial institutions effecting transactions in Fund
shares may be required to register as dealers pursuant to state law.
    
     Using Federal Funds.  Dreyfus Transfer, Inc., the Fund's transfer and
dividend disbursing agent (the "Transfer Agent"), or the Fund may attempt
to notify the investor upon receipt of checks drawn on banks that are not
members of the Federal Reserve System as to the possible delay in
conversion into Federal Funds and may attempt to arrange for a better means
of transmitting the money.  If the investor is a customer of a securities
dealer, bank or other financial institution and his order to purchase Fund
shares is paid for other than in Federal Funds, the securities dealer, bank
or other financial institution, acting on behalf of its customer, will
complete the conversion into, or itself advance, Federal Funds generally on
the business day following receipt of the customer order.  The order is
effective only when so converted and received by the Transfer Agent.  An
order for the purchase of Fund shares placed by an investor with a
sufficient Federal Funds or cash balance in his brokerage account with a
securities dealer, bank or other financial institution will become
effective on the day that the order, including Federal Funds, is received
by the Transfer Agent.

   
                                SERVICE PLAN
                           (INVESTOR SHARES ONLY)
    
     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "Service
Plan."
   
     Rule 12b-1 (the "Rule") adopted by the Securities and Exchange
Commission under the 1940 Act provides, among other things, that an
investment company may bear expenses of distributing its shares only
pursuant to a plan adopted in accordance with the Rule.  The Fund's Board
has adopted such a plan (the "Service Plan") with respect to the Fund's
Investor Shares.  Pursuant to the Service Plan, the Fund (a) reimburses the
Distributor for distributing Investor Shares and (b) pays the Manager,
Dreyfus Service Corporation and any affiliate of either of them
(collectively, "Dreyfus") for advertising and marketing Investor Shares and
providing certain services to the holders of Investor Shares.  Under the
Service Plan, the Distributor and Dreyfus may make payments to certain
financial institutions, securities dealers and other financial industry
professionals (collectively, "Service Agents") with respect to these
services.  The Fund's Board believes that there is a reasonable likelihood
that the Service Plan will benefit the Fund and the holders of Investor
Shares.
    
   
     A quarterly report of the amounts expended under the Service Plan, and
the purposes for which such expenditures were incurred, must be made to the
Board members for their review.  In addition, the Service Plan provides
that it may not be amended to increase materially the costs which holders
of Investor Shares may bear pursuant to the Service Plan without the
approval of the holders of Investor Shares and that other material
amendments of the Service Plan must be approved by the Board, and by the
Board members who are not "interested persons" (as defined in the 1940 Act)
of the Fund and have no direct or indirect financial interest in the
operation of the Service Plan or in any agreements entered into in
connection with the Service Plan, by vote cast in person at a meeting
called for the purpose of considering such amendments.  The Service Plan is
subject to annual approval by such vote of the Board members cast in person
at a meeting called for the purpose of voting on the Service Plan.  The
Service Plan was so approved by the Board members at a meeting held on
February 1, 1996.  The Service Plan may be terminated at any time by vote
of a majority of the Board members who are not "interested persons" and
have no direct or indirect financial interest in the operation of the
Service Plan or in any agreements entered into in connection with the
Service Plan or by vote of the holders of a majority of the Investor
Shares.
    
   
     For the fiscal year ended September 30, 1996, the Fund paid $41,623
(none of which was paid for printing prospectuses) to the Distributor, with
respect to Investor Shares, pursuant to the Service Plan.
    
   
                          SHAREHOLDER SERVICES PLAN
                         (INSTITUTIONAL SHARES ONLY)
    
     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "Shareholder
Services Plan."
   
     The Fund has adopted a Shareholder Services Plan (the "Plan") pursuant
to which the Fund has agreed to reimburse Dreyfus Service Corporation for
certain allocated expenses of providing personal services and/or
maintaining shareholder accounts with respect to Institutional Shares only.
The services provided may include personal services relating to shareholder
accounts, such as answering shareholder inquiries regarding the Fund and
providing reports and other information, and services related to the
maintenance of shareholder accounts.
    
   
     A quarterly report of the amounts expended under the Plan, and the
purposes for which such expenditures were incurred, must be made to the
Board members for their review.  In addition, the Plan provides that
material amendments of the Plan must be approved by the Board, and by the
Board members who are not "interested persons" (as defined in the 1940 Act)
of the Fund or the Manager and have no direct or indirect financial
interest in the operation of the Plan, by vote cast in person at a meeting
called for the purpose of considering such amendments.  The Plan is subject
to annual approval by such vote of the Board members cast in person at a
meeting called for the purpose of voting on the Plan.  The Plan was last so
approved on February 1, 1996.  The Plan is terminable at any time by vote
of a majority of the Board members who are not "interested persons" (as
defined in the 1940 Act) and have no direct or indirect financial interest
in the operation of the Plan.
    
   
     For the fiscal year ended September 30, 1996, no fee was paid by the
Fund under the Plan pursuant to an undertaking by the Manager.
    
   
                            REDEMPTION OF SHARES
    
   
     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "How to
Redeem Shares."
    
     Redemption by Wire or Telephone.  By using this procedure, the
investor authorizes the Transfer Agent to act on wire or telephone
redemption instructions from any person representing himself or herself to
be an authorized representative of the investor and reasonably believed by
the Transfer Agent to be genuine.  Ordinarily, the Fund will initiate
payment for shares redeemed pursuant to this procedure on the next business
day after receipt if the Transfer Agent receives the redemption request in
proper form.  Such payment will be made to a bank that is a member of the
Federal Reserve System.

     Investors with access to telegraphic equipment may wire redemption
requests to the Transfer Agent by employing the following transmittal code
which may be used for domestic or overseas transmission:

                               Transfer Agent's
     Transmittal Code          Answer Back Sign

     144295                    144295 TSSG PREP

     Investors who do not have direct access to telegraphic equipment may
have the wire transmitted by contacting a TRT Cables operator at 1-800-654-
7171, toll free.  Investors should advise the operator that the above
transmittal code must be used and should also inform the operator of the
Transfer Agent's answer back sign.
   
     Redemption Commitment.  The Fund has committed itself to pay in cash
all redemption requests by any shareholder of record, limited in amount
during any 90-day period to the lesser of $250,000 or 1% of the value of
the Fund's net assets at the beginning of such period.  Such commitment is
irrevocable without the prior approval of the Securities and Exchange
Commission.  In the case of requests for redemption in excess of such
amount, the Board reserves the right to make payments in whole or in part
in securities or other assets of the Fund in case of an emergency or at any
time a cash distribution would impair the liquidity of the Fund to the
detriment of the existing shareholders.  In such event the securities would
be valued in the same manner as the Fund's portfolio is valued.  If the
recipient sold such securities, brokerage charges might be incurred.
    
     Suspension of Redemptions.  The right of redemption may be suspended
or the date of payment postponed (a) during any period when the New York
Stock Exchange is closed (other than a customary weekend or holiday
closing), (b) when trading in the markets the Fund ordinarily utilizes is
restricted, or when an emergency exists as determined by the Securities and
Exchange Commission so that disposal of the Fund's investments or
determination of its net asset value is not reasonably practicable, or (c)
for such other periods as the Securities and Exchange Commission by order
may permit to protect the Fund's shareholders.


                      DETERMINATION OF NET ASSET VALUE
   
     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "How to Buy
Shares."
    
     Valuation of Portfolio Securities.  The Fund's investments are valued
each business day using available market quotations or at fair value as
determined by one or more independent pricing services (collectively, the
"Service") approved by the Board.  The Service may use available market
quotations, employ electronic data processing techniques and/or a matrix
system to determine valuations.  The Service's procedures are reviewed by
the Fund's officers under the general supervision of the Board.  Expenses
and fees, including the management fee, accrue daily and are taken into
account for the purpose of determining the net asset value of the relevant
Class of Fund shares.

     New York Stock Exchange Closings.  The holidays (as observed) on which
the New York Stock Exchange and Transfer Agent are closed currently are:
New Year's Day, Presidents' Day, Good Friday, Memorial Day, Independence
Day, Labor Day, Thanksgiving and Christmas.


                     DIVIDENDS, DISTRIBUTIONS AND TAXES

     The following information supplements and should read in conjunction
with the section in Fund's Prospectus entitled "Dividends, Distributions
and Taxes"
   
     Management believes that the Fund has qualified as a "regulated
investment company" under the Internal Revenue Code of 1986, as amended
(the "Code"), for the fiscal year ended September 30, 1996.  The Fund
intends to continue to so qualify if such qualification is in the best
interests of its shareholders.  Qualification as a regulated investment
company relieves the Fund from any liability for Federal income taxes to
the extent its earnings are distributed in accordance with the applicable
provisions of the Code.  The term "regulated investment company" does not
imply the supervision of management or investment practices or policies by
any government agency.
    
     Any dividend or distribution paid shortly after an investor's purchase
may have the effect of reducing the aggregate net asset value of his shares
below the cost of his investment.  Such a dividend or distribution would be
a return on investment in an economic sense, although taxable as stated
above.  In addition, the Code provides that if a shareholder holds shares
of the Fund for six months or less and has received a capital gain
distribution with respect to such shares, any loss incurred on the sale of
such shares will be treated as a long-term capital  loss to the extent of
the capital gain distribution received.

     Ordinarily, gains and losses realized from portfolio transactions will
be treated as capital gain or loss.  However, all or a portion of any gain
realized by the Fund from the sale or other disposition of certain market
discount bonds will be treated as ordinary income under Section 1276 of the
Code.

     Investment by the Fund in securities issued or acquired at a discount
or providing for deferred interest or for payment of interest in the form
of additional obligations could, under special tax rules, affect the
amount, timing and character of distributions to shareholders.  For
example, the Fund may be required to take into account annually a portion
of the discount (or deemed discount) at which such securities were issued
and to distribute such portion in order to maintain its qualification as a
regulated investment company.  In such case, the Fund may have to dispose
of securities which it might otherwise have continued to hold in order to
generate cash to satisfy these distribution requirements.


                           PORTFOLIO TRANSACTIONS

     Portfolio securities ordinarily are purchased directly from the issuer
or from an underwriter or a market maker for the securities.  Usually no
brokerage commissions are paid by the Fund for such purchases.  Purchases
from underwriters of portfolio securities include a concession paid by the
issuer to the underwriter and the purchase price paid to, and sale price
received from, market makers for the securities may reflect the spread
between the bid and asked price.  No brokerage commissions have been paid
by the Fund to date.

     Transactions are allocated to various dealers by the Fund's portfolio
managers in their best judgment.  The primary consideration is prompt and
effective execution of orders at the most favorable price.  Subject to that
primary consideration, dealers may be selected for research, statistical or
other services to enable the Manager to supplement its own research and
analysis with the views and information of other securities firms and may
be selected based upon their sales of Fund shares.

     Research services furnished by brokers through which the Fund effects
securities transactions may be used by the Manager in advising other funds
it advises and, conversely, research services furnished to the Manager by
brokers in connection with other funds the Manager advises may be used by
the Manager in advising the Fund.  Although it is not possible to place a
dollar value on these services, it is the opinion of the Manager that the
receipt and study of such services should not reduce the overall expenses
of its research department.


                              INVESTOR SERVICES

     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "Investor
Services."

     Fund Exchanges.  Shares will be exchanged at the net asset value next
determined after receipt of an exchange request in proper form.  By using
the Telephone Exchange Privilege, the investor authorizes the Transfer
Agent to act on exchange instructions from any person representing himself
or herself to be an authorized representative of the investor and
reasonably believed by the Transfer Agent to be genuine.  Telephone
exchanges may be subject to limitations as to the amount involved or the
number of telephone exchanges permitted.  Shares in certificate form are
not eligible for telephone exchange.
   
     Dreyfus Auto-Exchange Privilege.  Dreyfus Auto-Exchange Privilege
permits an investor to purchase, in exchange for shares of the Fund, shares
of the same class of Dreyfus Cash Management, Dreyfus Cash Management Plus,
Inc., Dreyfus Government Cash Management, Dreyfus Municipal Cash Management
Plus, Dreyfus New York Municipal Cash Management, Dreyfus Tax Exempt Cash
Management, Dreyfus Treasury Cash Management, or Dreyfus Treasury Prime
Cash Management.  This Privilege is available only for existing accounts.
Shares will be exchanged on the basis of relative net asset value.
Enrollment in or modification or cancellation of the Privilege is effective
three business days following notification by the investor.  An investor
will be notified if its account falls below the amount designated to be
exchanged under this Privilege.  In this case, an investor's account will
fall to zero unless additional investments are made in excess of the
designated amount prior to the next Auto-Exchange Transaction.  Shares
issued in certificate form are not eligible for Auto-Exchange.
    
     The Fund Exchanges service and the Dreyfus Auto-Exchange Privilege are
available to investors resident in any state in which shares of the Fund
being acquired may legally be sold.  Shares may be exchanged only between
accounts having identical names and other identifying designations.

     The Fund reserves the right to reject any exchange request in whole or
in part.  The Fund Exchanges service or the Dreyfus Auto-Exchange Privilege
may be modified or terminated at any time upon notice to investors.


                           PERFORMANCE INFORMATION

     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "Performance
Information."
   
     For the thirty-day period ended September 30, 1996, the Fund's current
yield was 5.98% for Institutional Shares and 5.72% for Investor Shares.
Current yield is computed pursuant to a formula which operates as follows:
The amount of the Fund's expenses accrued for the 30-day period (net of
reimbursements) is subtracted from the amount of the dividends and interest
earned (computed in accordance with regulatory requirements) by the Fund
during the period.  That result is then divided by the product of:  (a) the
average daily number of shares outstanding during the period that were
entitled to receive dividends, and (b) the net asset value per share on the
last day of the period less any undistributed earned income per share
reasonably expected to be declared as a dividend shortly thereafter.  The
quotient is then added to 1, and that sum is raised to the 6th power, after
which 1 is subtracted.  The current yield is then arrived at by multiplying
the result by 2.
    
   
     For the 1 and 2.923 year periods ended September 30, 1996, the Fund's
average annual total return for Institutional Shares was 6.03% and 5.90%,
respectively.  The Fund's average annual total return for Investor Shares
for the same periods was 5.76% and 5.82%, respectively.  Average annual
total return is calculated by determining the ending redeemable value of an
investment purchased with a hypothetical $1,000 payment made at the
beginning of the period (assuming the reinvestment of dividends and
distributions), dividing by the amount of the initial investment, taking
the "n"th root of the quotient (where "n" is the number of years in the
period) and subtracting 1 from the result.
    
   
     The Fund's total return for the period October 29, 1993 (commencement
of operations) through September 30, 1996, was 18.25% for Institutional
Shares and 17.98% for Investor Shares.  Total return is calculated by
subtracting the amount of the net asset value per share at the beginning of
a stated period from the net asset value per share at the end of the period
(after giving effect to the reinvestment of dividends and distributions
during the period), and dividing the result by the net asset value per
share at the beginning of the period.
    
     From time to time, advertising materials for the Fund may refer to or
discuss then-current or past economic conditions, developments and/or
events, including actual or proposed tax legislation.  From time to time,
advertising materials for the Fund may also refer to statistical or other
information concerning trends relating to investment companies, as compiled
by industry associations such as the Investment Company Institute.  From
time to time advertising materials for the Fund also may refer to
Morningstar ratings and related analyses supporting the rating.  From time
to time, advertising material for the Fund may include biographical
information relating to its portfolio manager and may refer to, or include
commentary by the portfolio manager relating to investment strategy, asset
growth, current or past business, political, economic or financial
conditions and other matters of general interest to investors.


                         INFORMATION ABOUT THE FUND

     The following information supplements and should be read in
conjunction with the section in the Fund's Prospectus entitled "General
Information."

     Each Fund share has one vote and, when issued and paid for in
accordance with the terms of the offering, is fully paid and nonassessable.
Fund shares have no preemptive, subscription or conversion rights and are
freely transferable.

     The Fund sends annual and semi-annual financial statements to all its
shareholders.


        TRANSFER AND DIVIDEND DISBURSING AGENT, COUNSEL, CUSTODIAN,
                          AND INDEPENDENT AUDITORS
   
     Dreyfus Transfer, Inc., a wholly-owned subsidiary of the Manager, P.O.
Box 9671, Providence, Rhode Island 02940-9671, serves as the Fund's
transfer and dividend disbursing agent.  Under a transfer agency agreement
with the Fund, the Transfer Agent arranges for the maintenance of
shareholder account records for the Fund, the handling of certain
communications between shareholders and the Fund and the payment of
dividends and distributions payable by the Fund.  For these services, the
Transfer Agent receives a monthly fee computed on the basis of the number
of shareholder accounts it maintains for the Fund during the month, and is
reimbursed for certain out-of-pocket expenses.  For the period December 1,
1995 (effective date of transfer agency agreement) through September 30,
1996, the Fund paid the Transfer Agent $1,134.  The Bank of New York, 90
Washington Street, New York, New York 10286, acts as custodian of the
Fund's investments.  Neither the Transfer Agent nor The Bank of New York
has any part in determining the investment policies of the Fund or which
securities are to be purchased or sold by the Fund.
    
     Stroock & Stroock & Lavan, 7 Hanover Square, New York, New York 10004-
2696, as counsel for the Fund, has rendered its opinion as to certain legal
matters regarding the due authorization and valid issuance of the shares
being sold pursuant to the Fund's Prospectus.

     Ernst & Young LLP, 787 Seventh Avenue, New York, New York 10019,
independent auditors, have been selected as auditors of the Fund.



<TABLE>
<CAPTION>


DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
STATEMENT OF INVESTMENTS                                                                                  SEPTEMBER 30,1996
                                                                                                   PRINCIPAL
BONDS AND NOTES-52.8%                                                                                AMOUNT            VALUE
                                                                                                    _______           _______
<S>                                                                                               <C>              <C>
U.S. TREASURY COUPON STRIPS-10.1%
    Zero Coupon, 2/15/1997..................................................                      $  20,000,000    $  19,606,216
                                                                                                                   _____________
U.S. TREASURY NOTES-42.7%
    8 1/2%, 7/15/1997.......................................................                         10,000,000       10,210,938
    6 1/8%, 8/31/1998.......................................................                         56,100,000       56,126,300
    6%, 8/15/1999...........................................................                         17,000,000       16,883,125
                                                                                                                   _____________
                                                                                                                      83,220,363
                                                                                                                   _____________
TOTAL BONDS AND NOTES
    (cost $102,960,903).....................................................                                        $102,826,579
                                                                                                                   =============
SHORT-TERM INVESTMENTS-8.0%
REPURCHASE AGREEMENTS-1.7%
Aubrey G. Lanston & Co., 5.65%
    dated 9/30/1996, due 10/1/1996 in the amount of $3,391,532
    (fully collateralized by $3,463,000 U.S. Treasury Bills,
    12/5/1996, value $3,430,102)............................................                     $    3,391,000      $ 3,391,000
U.S. TREASURY BILLS-6.3%
    5.19%, 12/5/1996........................................................                         12,330,000       12,219,276
                                                                                                                   _____________
TOTAL SHORT-TERM INVESTMENTS
    (cost $15,605,457)......................................................                                        $ 15,610,276
                                                                                                                   =============
TOTAL INVESTMENTS
    (cost $118,566,360).....................................................                         60.8%          $118,436,855
                                                                                                    ======         =============
CASH AND RECEIVABLES (NET)..................................................                         39.2%          $ 76,342,959
                                                                                                    ======         =============
NET ASSETS  ...........................................................                             100.0%          $194,779,814
                                                                                                    ======         =============


See notes to financial statements.




DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
STATEMENT OF ASSETS AND LIABILITIES                          SEPTEMBER 30, 1996
ASSETS:
    Investments in securities, at value-Note 1(a,b)
      (cost $118,566,360)-see statement.....................................                                       $118,436,855
    Cash....................................................................                                          2,399,930
    Receivable for investment securities sold...............................                                         80,524,374
    Interest receivable.....................................................                                            461,924
                                                                                                                    ____________
                                                                                                                     201,823,083
LIABILITIES:
    Due to The Dreyfus Corporation..........................................                     $      38,117
    Due to Distributor......................................................                             5,152
    Payable for shares of Beneficial Interest redeemed......................                          7,000,000       7,043,269
                                                                                                   ____________     ____________
NET ASSETS  ................................................................                                       $194,779,814
                                                                                                                  ==============
REPRESENTED BY:
    Paid-in capital.........................................................                                       $198,144,871
    Accumulated net realized (loss) on investments..........................                                         (3,235,552)
    Accumulated net unrealized (depreciation) on investments-Note 4.........                                           (129,505)
                                                                                                                    ____________
NET ASSETS at value.........................................................                                        $194,779,814
                                                                                                                  ==============
Shares of Beneficial Interest outstanding:
    Class A Shares
      (unlimited number of $.001 par value shares authorized)...............                                         85,893,872
                                                                                                                  ==============
    Class B Shares
      (unlimited number of $.001 par value shares authorized)...............                                         12,298,420
                                                                                                                  ==============
NET ASSET VALUE per share:
    Class A Shares
      ($170,289,579 / 85,893,872 shares)....................................                                               $1.98
                                                                                                                          ======
    Class B Shares
      ($24,490,235 / 12,298,420 shares).....................................                                               $1.99
                                                                                                                          ======
STATEMENT OF OPERATIONS            YEAR ENDED SEPTEMBER 30, 1996
INVESTMENT INCOME:
    INTEREST INCOME.........................................................                                       $  15,471,548
    EXPENSES:
      Management fee-Note 3(a)..............................................                       $    468,699
      Distribution fees (Class B shares)-Note 3(b)..........................                             41,623
                                                                                                     __________
          TOTAL EXPENSES....................................................                                             510,322
                                                                                                                    ____________
          INVESTMENT INCOME-NET.............................................                                          14,961,226
REALIZED AND UNREALIZED (LOSS) ON INVESTMENTS-Note 4:
    Net realized (loss) on investments......................................                       $(2,484,085)
    Net unrealized (depreciation) on investments............................                           (14,896)
                                                                                                     __________
          NET REALIZED AND UNREALIZED (LOSS) ON INVESTMENTS.................                                         (2,498,981)
                                                                                                                    ____________
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS........................                                        $ 12,462,245
                                                                                                                   =============

See notes to financial statements.

DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
STATEMENT OF CHANGES IN NET ASSETS
                                                                                             YEAR ENDED SEPTEMBER 30,
                                                                                       ______________________________________
                                                                                             1995                    1996
                                                                                        _____________            _____________
OPERATIONS:
    Investment income-net...................................................          $     6,040,397            $ 14,961,226
    Net realized gain (loss) on investments.................................                   17,213             (2,484,085)
    Net unrealized appreciation (depreciation) on investments for the year..                  487,103                 (14,896)
                                                                                        _____________            _______________
          NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS..............                6,544,713              12,462,245
                                                                                        _____________            _______________
DIVIDENDS TO SHAREHOLDERS FROM;
    Investment income-net:
      Class A shares........................................................              (5,125,168)             (13,968,029)
      Class B shares........................................................                (886,038)              (1,022,388)
                                                                                        _____________            _______________
          TOTAL DIVIDENDS...................................................              (6,011,206)              (14,990,417)
                                                                                        _____________            _______________
BENEFICIAL INTEREST TRANSACTIONS:
    Net proceeds from shares sold:
      Class A shares........................................................              205,025,138               257,457,775
      Class B shares........................................................                9,691,420                41,742,937
    Dividends reinvested:
      Class A shares........................................................                2,977,656                10,564,901
      Class B shares........................................................                  735,883                   872,362
    Cost of shares redeemed:
      Class A shares........................................................           (138,068,260)               (256,062,818)
      Class B shares........................................................            (27,751,723)                (23,978,886)
                                                                                        _____________            _______________
          INCREASE IN NET ASSETS FROM BENEFICIAL INTEREST TRANSACTIONS......             52,610,114                  30,596,271
                                                                                        _____________            _______________
            TOTAL INCREASE IN NET ASSETS....................................             53,143,621                   28,068,099
NET ASSETS:
    Beginning of year.......................................................            113,568,094                 166,711,715
                                                                                        _____________            _______________
    End of year (including undistributed investment income-net of $29,191 in 1995)    $ 166,711,715                $ 194,779,814
                                                                                       ==============              =============


</TABLE>
<TABLE>
<CAPTION>



                                                                                          SHARES
                                                      __________________________________________________________________________
                                                                   CLASS A                                  CLASS B
                                                      ________________________________          ________________________________
                                                          YEAR ENDED SEPTEMBER 30,                 YEAR ENDED SEPTEMBER 30,
                                                      ________________________________          ________________________________
                                                           1995               1996                 1995                1996
                                                      ____________        ____________         ___________      ________________
<S>                                                     <C>               <C>                    <C>                 <C>
CAPITAL SHARE TRANSACTIONS:
    Shares sold............................             103,232,663       128,426,345            4,898,778           20,911,548
    Shares issued for dividends reinvested.               1,502,166         5,314,554              372,428              436,954
    Shares redeemed........................            (70,202,557)     (128,532,027)         (14,048,233)          (12,025,940)
                                                      ____________        ____________         ___________      ________________
          NET INCREASE (DECREASE) IN
            SHARES OUTSTANDING.............             34,532,272          5,208,872           (8,777,027)            9,322,562
                                                     ==============      =============         ============      ===============

See notes to financial statements.
</TABLE>

DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
FINANCIAL HIGHLIGHTS

    Reference is made to page    of the Fund's Prospectus dated



See notes to financial statements.

DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
NOTES TO FINANCIAL STATEMENTS
NOTE 1-SIGNIFICANT ACCOUNTING POLICIES:
    Dreyfus Institutional Short Term Treasury Fund ("the Fund") is registered
under the Investment Company Act of 1940 ("Act") as a diversified open-end
management investment company. The Fund's investment objective is to provide
investors with a high level of current income with minimum fluctuation of
principal value. The Dreyfus Corporation ("Manager") serves as the Fund's
investment adviser. The Manager is a direct subsidiary of Mellon Bank, N.A.
("Mellon").
    Premier Mutual Fund Services, Inc. (the "Distributor") acts as the
distributor of the Fund's shares, which are sold without a sales load. The
Fund offers both Class A and Class B shares. Class B shares are subject to a
Service Plan adopted pursuant to Rule 12b-1 under the Act. Other differences
between the two Classes include the services offered to and the expenses
borne by each Class and certain voting rights.
    The Fund's financial statements are prepared in accordance with generally
accepted accounting principles which may require the use of management
estimates and assumptions. Actual results could differ from those estimates.
    (A) PORTFOLIO VALUATION: The Fund's investments, including U.S. Treasury
Bills, are valued at the mean between the quoted bid prices and asked prices.
Other short-term investments are carried at amortized cost, which
approximates value.
    (B) SECURITIES TRANSACTIONS AND INVESTMENT INCOME: Securities
transactions are recorded on a trade date basis. Interest income, including,
where applicable, amortization of discount on investments, is recognized on
the accrual basis. Realized gain and loss from securities transactions are
recorded on the identified cost basis.
    The Fund may enter into repurchase agreements with financial
institutions, deemed to be creditworthy by the Fund's Manager, subject to the
seller's agreement to repurchase and the Fund's agreement to resell such
securities at a mutually agreed upon price. Securities purchased subject to
repurchase agreements are deposited with the Fund's custodian and, pursuant
to the terms of the repurchase agreement, must have an aggregate market value
greater than or equal to the repurchase price plus accrued interest at all
times. If the value of the underlying securities falls below the value of the
repurchase price plus accrued interest, the Fund will require the seller to
deposit additional collateral by the next business day. If the request for
additional collateral is not met, or the seller defaults on its repurchase
obligation, the Fund maintains the right to sell the underlying securities at
market value and may claim any resulting loss against the seller.
    (C) DIVIDENDS TO SHAREHOLDERS: It is the policy of the Fund to declare
dividends daily from investment income-net. Such dividends are paid monthly.
Dividends from net realized capital gain are normally declared and paid
annually, but the Fund may make distributions on a more frequent basis to
comply with the distribution requirements of the Internal Revenue Code. To
the extent that net realized capital gain can be offset by capital loss
carryovers, it is the policy of the Fund not to distribute such gain.
    (D) FEDERAL INCOME TAXES: It is the policy of the Fund to continue to
qualify as a regulated investment company, if such qualification is in the
best interests of its shareholders, by complying with the applicable
provisions of the Internal Revenue Code, and to make distributions of taxable
income sufficient to relieve it from substantially all Federal income and
excise taxes.

DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
    The Fund has an unused capital loss carryover of approximately $777,000
available for Federal income tax purposes to be
applied against future net securities profits, if any, realized subsequent to
September 30, 1996. The carryover does not include net realized securities
losses from November 1, 1995 through September 30, 1996 which are treated,
for Federal income tax purposes, as arising in fiscal 1997. If not applied,
$728,000 of the carryover expires in fiscal 2003 and $49,000 expires in
fiscal 2004.
NOTE 2-BANK LINE OF CREDIT:
    The Fund participates with other Dreyfus-managed Funds in a $100 million
unsecured line of credit primarily to be utilized for temporary or emergency
purposes, including the financing of redemptions. Interest is charged to the
Fund at rates which are related to the Federal Funds rate in effect at the
time of borrowings. For the period ended September 30, 1996, the Fund did not
borrow under the line of credit.
NOTE 3-MANAGEMENT FEE AND OTHER TRANSACTIONS WITH AFFILIATES:
    (A) Pursuant to a management agreement ("Agreement") with the Manager,
the management fee is computed at the annual rate of .20 of 1% of the value
of the Fund's average daily net assets and is payable monthly.
    Unless the Manager gives the Fund's investors 90 days notice to the
contrary, the Manager, and not the Fund, will be liable for Fund expenses
(exclusive of taxes, brokerage, interest on borrowings and with the prior
written consent of the necessary state securities commissions, extraordinary
expenses) other than the following expenses, which will be borne by the Fund:
the management fee, and with respect to the Fund's Class B shares, Rule 12b-1
Service Plan expenses.
    Effective December 1, 1995, the Manager compensates Dreyfus Transfer,
Inc., a wholly-owned subsidiary, under a transfer agency agreement for
providing personnel and facilities to perform transfer agency services for
the Fund.
    Effective May 10, 1996, the Manager compensates Mellon under a custody
agreement for providing custodial services for the Fund.
    (B) Under the Class B Service Plan (the "Plan") adopted pursuant to Rule
12b-1 under the Act, the Fund (a) reimburses the Distributor for distributing
the Fund's Class B shares and (b) pays the Manager, Dreyfus Service
Corporation, a wholly-owned subsidiary of the Manager, and any affiliate of
either of them (collectively, "Dreyfus") for advertising and marketing
relating to the Fund's Class B shares and for providing certain services
relating to Class B shareholder accounts, such as answering shareholder inquir
ies regarding the Fund and providing reports and other information, and
services related to the maintenance of shareholder accounts ("Servicing"), at
an aggregate annual rate of .25 of 1% of the value of the average daily net
assets of Class B shares. Both the Distributor and Dreyfus may pay one or
more Service Agents (a securities dealer, financial institution or other
industry professional) a fee in respect of the Fund's Class B shares owned by
shareholders with whom the Service Agent has a Servicing relationship or for
whom the Service Agent is the dealer or holder of record. Both the
Distributor and Dreyfus determines the amounts, if any, to be paid to Service
Agents under the Plan and the basis on which such payments are made. The fees
payable under the Plan are payable without regard to actual expenses
incurred. During the year ended September 30, 1996, $41,623 was charged to
the Fund pursuant to the Plan.

DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
    (C) Each trustee who is not an "affiliated person" as defined in the Act
receives an annual fee of $1,000 and an attendance
fee of $250 per meeting. The Chairman of the Board receives an additional 25%
of such compensation.
NOTE 4-SECURITIES TRANSACTIONS:
    The aggregate amount of purchases and sales of investment securities,
excluding short term securities, during the year ended September 30, 1996,
amounted to $1,259,085,622 and $1,283,054,558, respectively.
    At September 30, 1996, accumulated net unrealized depreciation on
investments was $129,505, consisting of $142,758 gross unrealized
appreciation and $272,263 gross unrealized depreciation.
    At September 30, 1996, the cost of investments for Federal income tax
purposes was substantially the same as the cost for financial reporting
purposes (see the Statement of Investments).

DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
SHAREHOLDERS AND BOARD OF TRUSTEES
DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
    We have audited the accompanying statement of assets and liabilities of
Dreyfus Institutional Short Term Treasury Fund, including the statement of
investments, as of September 30, 1996, and the related statement of
operations for the year then ended, the statement of changes in net assets
for each of the two years in the period then ended, and financial highlights
for each of the years indicated therein. These financial statements and
financial highlights are the responsibility of the Fund's management. Our
responsibility is to express an opinion on these financial statements and
financial highlights based on our audits.
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements and
financial highlights are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures
in the financial statements. Our procedures included verification by
examination of securities held by the custodian as of September 30, 1996 and
confirmation of securities not held by the custodian by correspondence with
others. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.
    In our opinion, the financial statements and financial highlights
referred to above present fairly, in all material respects, the financial
position of Dreyfus Institutional Short Term Treasury Fund at September 30,
1996, the results of its operations for the year then ended, the changes in
its net assets for each of the two years in the period then ended, and the
financial highlights for each of the indicated years, in conformity with
generally accepted accounting principles.

                              [Ernst & Young LLP signature logo]

New York, New York
October 31, 1996




                DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND


                           PART C. OTHER INFORMATION
                           _________________________


Item 24.   Financial Statements and Exhibits. - List
_______    _________________________________________

     (a)   Financial Statements:

                Included in Part A of the Registration Statement
   
                Condensed Financial Information for the period from October
                29, 1993 (commencement of operations) to September 30, 1994
                and for the two fiscal years ended September 30, 1996.
    
                Included in Part B of the Registration Statement:
   
                     Statement of Investments-- September 30, 1996.
    
   
                     Statement of Assets and Liabilities-- September 30,
                     1996.
    
   
                     Statement of Operations--year ended September 30, 1996.
    
   
                     Statement of Changes in Net Assets--for each of the two
                     years ended September 30, 1995 and 1996.
    
                     Notes to Financial Statements.
   
                     Report of Ernst & Young LLP, Independent Auditors, dated
                     October 31, 1996.
    





All Schedules and other financial statement information, for which provision
is made in the applicable accounting regulations of the Securities and
Exchange Commission, are either omitted because they are not required under
the related instructions, they are inapplicable, or the required information
is presented in the financial statements or notes thereto which are included
in Part B of the Registration Statement.


Item 24.   Financial Statements and Exhibits. - List (continued)
_______    _____________________________________________________

  (b)      Exhibits:

  (1)      Registrant's Declaration of Trust is incorporated by reference to
           Exhibit (1) of Pre-Effective Amendment No. to the Registration
           Statement on Form N-1A, filed on October 8, 1993, and Exhibit
           (1)(b) of Post-Effective Amendment No. 1 to the Registration
           Statement on Form N-1A, filed on April 29, 1994.

  (2)      Registrant's By-Laws, as amended, are incorporated by reference to
           Exhibit (2) of Post-Effective Amendment No. 1 to the Registration
           Statement on Form N-1A, filed on April 29, 1994.

  (4)      Specimen certificate for the Registrant's securities is
           incorporated by reference to Exhibit (4) of Pre-Effective
           Amendment No. 1 to the Registration Statement on Form N-1A, filed
           on October 8, 1993.

  (5)      Management Agreement is incorporated by reference to Exhibit (5)
           of Post-Effective Amendment No. 2 to the Registration Statement on
           Form N-1A, filed on January 28, 1995.

  (6)(a)   Distribution Agreement is incorporated by reference to Exhibit (6)
           of Post-Effective Amendment No. 2 to the Registration Statement on
           Form N-1A, filed on January 28, 1995.

  (6)(b)   Forms of Service Agreement are incorporated by reference to
           Exhibit 6(b) of Post-Effective Amendment No. 2 to the Registration
           Statement on Form N-1A, filed on January 28, 1995.

  (8)      Amended and Restated Custody Agreement is incorporated by
           reference to Exhibit (8) of Post-Effective Amendment No. 1 to the
           Registration Statement on Form N-1A, filed on October 8, 1993.
   
  (9)      Shareholder Services Plan is incorporated by reference to Exhibit
           (9) of Post-Effective Amendment No. 3 to the Registration
           Statement on Form N-1A, filed on December 29, 1995.
    
  (10)     Opinion and consent of Registrant's counsel is incorporated by
           reference to Exhibit (10) of Pre-Effective Amendment No. 1 to the
           Registration Statement on Form N-1A, filed on October 8, 1993.

  (11)     Consent of Independent Auditors.

  (15)     Service Plan is incorporated by reference to Exhibit (15) of Post-
           Effective Amendment No. 2 to the Registration Statement on Form
           N-1, filed on January 28, 1995.

  (16)     Schedules of Computation of Performance Data are incorporated by
           reference to Exhibit (16) of Pre-Effective Amendment No. 1 to the
           Registration Statement on Form N-1A, filed on October 8, 1993.

  (17)     Financial Data Schedule.
   
  (18)     Rule 18f-3 Plan is incorporated by reference to Exhibit (18) of
           Pre-Effective Amendment No. 3 to the Registration Statement on
           Form N-1A, filed on December 29, 1995.
    

Item 24.   Financial Statements and Exhibits. - List (continued)
_______    _____________________________________________________

           Other Exhibits
           ______________

                (a)  Powers of Attorney of the Directors and officers are
                     incorporated by reference to Other Exhibits (a) of Post-
                     Effective Amendment No. 2 to the Registration Statement
                     on Form N-1A, filed on January 28, 1995.  An additional
                     Power of Attorney is included herein.

                (b)  Certificate of Secretary is incorporated by reference to
                     Other Exhibits (b) of Post-Effective Amendment No. 2 to
                     the Registration Statement on Form N-1A, filed on
                     January 28, 1995.

Item 25.   Persons Controlled by or under Common Control with Registrant.
_______    ______________________________________________________________

           Not Applicable

Item 26.   Number of Holders of Securities.
_______    ________________________________
   
            (1)                              (2)

                                                Number of Record
         Title of Class                  Holders as of December 2, 1996
         ______________                  ______________________________

         Shares of Beneficial Interest
         (Par value $.001)
         Institutional Shares                         57
         Investor Shares                              29
    
Item 27.    Indemnification
_______     _______________

         The Statement as to the general effect of any contract,
         arrangements or statute under which a trustee, officer, underwriter
         or affiliated person of the Registrant is insured or indemnified in
         any manner against any liability which may be incurred in such
         capacity, other than insurance provided by any director, officer,
         affiliated person or underwriter for their own protection, is
         incorporated by reference to Item 1 of Part II of  Pre-Effective
         Amendment No. 1 to the Registration Statement on Form N-1A, filed
         on October 8, 1993.

         Reference is also made to the Distribution Agreement attached as
         Exhibit (6)(a) of Post-Effective Amendment No. 2 to the
         Registration Statement on Form N-1A, filed on January 28, 1995.

Item 28.    Business and Other Connections of Investment Adviser.
_______     ____________________________________________________

            The Dreyfus Corporation ("Dreyfus") and subsidiary companies
            comprise a financial service organization whose business
            consists primarily of providing investment management services
            as the investment adviser and manager for sponsored investment
            companies registered under the Investment Company Act of 1940
            and as an investment adviser to institutional and individual
            accounts.  Dreyfus also serves as sub-investment adviser to
            and/or administrator of other investment companies. Dreyfus
            Service Corporation, a wholly-owned subsidiary of Dreyfus, is a
            registered broker-dealer.  Dreyfus Management, Inc., another
            wholly-owned subsidiary, provides investment management services
            to various pension plans, institutions and individuals.


Item 28.  Business and Other Connections of Investment Adviser (continued)
________  ________________________________________________________________

          Officers and Directors of Investment Adviser
          ____________________________________________


Name and Position
with Dreyfus                  Other Businesses
_________________             ________________

MANDELL L. BERMAN             Real estate consultant and private investor
Director                           29100 Northwestern Highway, Suite 370
                                   Southfield, Michigan 48034;
                              Past Chairman of the Board of Trustees:
                                   Skillman Foundation;
                              Member of The Board of Vintners Intl.

FRANK V. CAHOUET              Chairman of the Board, President and
Director                      Chief Executive Officer:
                                   Mellon Bank Corporation****;
                                   Mellon Bank, N.A.****
                              Director:
                                   Avery Dennison Corporation
                                   150 North Orange Grove Boulevard
                                   Pasadena, California 91103;
                                   Saint-Gobain Corporation
                                   750 East Swedesford Road
                                   Valley Forge, Pennsylvania 19482;
                                   Teledyne, Inc.
                                   1901 Avenue of the Stars
                                   Los Angeles, California 90067

ALVIN E. FRIEDMAN             Senior Adviser to Dillon, Read & Co. Inc.
Director                           535 Madison Avenue
                                   New York, New York 10022;
                              Director and Member of the Executive
                                   Committee of Avnet, Inc.**

LAWRENCE M. GREENE            None
Director

JULIAN M. SMERLING            None
Director

W. KEITH SMITH                Chairman and Chief Executive Officer:
Chairman of the Board              The Boston Company*****;
                              Vice Chairman of the Board:
                                   Mellon Bank Corporation****;
                                   Mellon Bank, N.A.****;
                              Director:
                                   Dentsply International, Inc.
                                   570 West College Avenue
                                   York, Pennsylvania 17405

CHRISTOPHER M. CONDRON        Vice Chairman:
President, Chief                   Mellon Bank Corporation****;
Executive Officer,                 The Boston Company*****;
Chief Operating               Deputy Director:
Officer and a                      Mellon Trust****;
Director                           Chief Executive Officer:
                                   The Boston Company Asset Management,
                                   Inc.*****;
                              President:
                                   Boston Safe Deposit and Trust
                                   Company*****

STEPHEN E. CANTER             Director:
Vice Chairman and                  The Dreyfus Trust Company++;
Chief Investment Officer,     Formerly, Chairman and Chief Executive
and a Director                     Officer:
                                   Kleinwort Benson Investment Management
                                        Americas Inc.*

LAWRENCE S. KASH              Chairman, President and Chief
Vice Chairman-Distribution    Executive Officer:
and a Director                     The Boston Company Advisors, Inc.
                                   53 State Street
                                   Exchange Place
                                   Boston, Massachusetts 02109
                              Executive Vice President and Director:
                                   Dreyfus Service Organization, Inc.***;
                              Director:
                                   Dreyfus America Fund
                                   The Dreyfus Consumer Credit
                                   Corporation*;
                                   The Dreyfus Trust Company++;
                                   Dreyfus Service Corporation*;
                              President:
                                   The Boston Company*****;
                                   Laurel Capital Advisors****;
                                   Boston Group Holdings, Inc.;
                              Executive Vice President:
                                   Mellon Bank, N.A.****;
                                   Boston Safe Deposit and Trust
                                   Company*****;

PHILIP L. TOIA                Chairman of the Board and Trust Investment
Vice Chairman-Operations      Officer:
and Administration                 The Dreyfus Trust Company++;
and a Director                Chairman of the Board and Chief Operating
                              Officer:
                                   Major Trading Corporation*;
                              Chairman and Director:
                                   Dreyfus Transfer, Inc.
                                   One American Express Plaza
                                   Providence, Rhode Island 02903
                              Director:
                                   Dreyfus Precious Metals, Inc.*;
                                   Dreyfus Service Corporation*;
                                   Seven Six Seven Agency, Inc.*;
                              President and Director:
                                   Dreyfus Acquisition Corporation*;
                                   The Dreyfus Consumer Credit
                                   Corporation*;
                                   Dreyfus-Lincoln, Inc.*;
                                   Dreyfus Management, Inc.*;
                                   Dreyfus Personal Management, Inc.*;
                                   Dreyfus Partnership Management, Inc.+;
                                   Dreyfus Service Organization, Inc.***;
                                   The Truepenny Corporation*;
                              Formerly, Senior Vice President:
                                   The Chase Manhattan Bank, N.A. and
                                   The Chase Manhattan Capital Markets
                                   Corporation
                                   One Chase Manhattan Plaza
                                   New York, New York 10081

WILLIAM T. SANDALLS, JR.      Director:
Senior Vice President and          Dreyfus Partnership Management, Inc.*;
Chief Financial Officer            Seven Six Seven Agency, Inc.*;
                              President and Director:
                                   Lion Management, Inc.*;
                              Executive Vice President and Director:
                                   Dreyfus Service Organization, Inc.*;
                              Vice President, Chief Financial Officer and
                              Director:
                                   Dreyfus Acquisition Corporation*;
                                   Dreyfus America Fund
                              Vice President and Director:
                                   The Dreyfus Consumer Credit
                                   Corporation*;
                                   The Truepenny Corporation*;
                              Treasurer, Financial Officer and Director:
                                   The Dreyfus Trust Company++;
                              Treasurer and Director:
                                   Dreyfus Management, Inc.*;
                                   Dreyfus Personal Management, Inc.*;
                                   Dreyfus Service Corporation*;
                                   Major Trading Corporation*;
                              Formerly, President and Director:
                                   Sandalls & Co., Inc.

WILLIAM F. GLAVIN, JR.        Executive Vice President:
Vice President-Corporate           Dreyfus Service Corporation*;
Development                   Senior Vice President:
                                   The Boston Company Advisors, Inc.
                                   53 State Street
                                   Exchange Place
                                   Boston, Massachusetts 02109

MARK N. JACOBS                Vice President, Secretary and Director:
Vice President,                    Lion Management, Inc.*;
General Counsel               Secretary:
and Secretary                      The Dreyfus Consumer Credit
                                   Corporation*;
                                   Dreyfus Management, Inc.*;
                              Assistant Secretary:
                                   Dreyfus Service Organization, Inc.***;
                                   Major Trading Corporation*;
                                   The Truepenny Corporation*

PATRICE M. KOZLOWSKI          None
Vice President-
Corporate Communications

MARY BETH LEIBIG              None
Vice President-
Human Resources


JEFFREY N. NACHMAN            President and Director:
Vice President-Mutual Fund         Dreyfus Transfer, Inc.
Accounting                         One American Express Plaza
                                   Providence, Rhode Island 02903

ANDREW S. WASSER              Vice President:
Vice President-Information         Mellon Bank Corporation****
Services

ELVIRA OSLAPAS                Assistant Secretary:
Assistant Secretary                Dreyfus Service Corporation*;
                                   Dreyfus Management, Inc.*;
                                   Dreyfus Acquisition Corporation, Inc.*;
                                   The Truepenny Corporation+





______________________________________

*       The address of the business so indicated is 200 Park Avenue, New
        York, New York 10166.
**      The address of the business so indicated is 80 Cutter Mill Road,
        Great Neck, New York 11021.
***     The address of the business so indicated is 131 Second Street,
        Lewes, Delaware 19958.
****    The address of the business so indicated is One Mellon Bank Center,
        Pittsburgh, Pennsylvania 15258.
*****   The address of the business so indicated is One Boston Place,
        Boston, Massachusetts 02108.
+       The address of the business so indicated is Atrium Building,
        80 Route 4 East, Paramus, New Jersey 07652.
++      The address of the business so indicated is 144 Glenn Curtiss
        Boulevard, Uniondale, New York 11556-0144.


Item 29.    Principal Underwriters
________  ______________________

      (a)   Other investment companies for which Registrant's principal
underwriter (exclusive distributor) acts as principal underwriter or
exclusive distributor:

             1)   Comstock Partners Funds, Inc.
             2)   Dreyfus A Bonds Plus, Inc.
             3)   Dreyfus Appreciation Fund, Inc.
             4)   Dreyfus Asset Allocation Fund, Inc.
             5)   Dreyfus Balanced Fund, Inc.
             6)   Dreyfus BASIC GNMA Fund
             7)   Dreyfus BASIC Money Market Fund, Inc.
             8)   Dreyfus BASIC Municipal Fund, Inc.
             9)   Dreyfus BASIC U.S. Government Money Market Fund
            10)   Dreyfus California Intermediate Municipal Bond Fund
            11)   Dreyfus California Tax Exempt Bond Fund, Inc.
            12)   Dreyfus California Tax Exempt Money Market Fund
            13)   Dreyfus Cash Management
            14)   Dreyfus Cash Management Plus, Inc.
            15)   Dreyfus Connecticut Intermediate Municipal Bond Fund
            16)   Dreyfus Connecticut Municipal Money Market Fund, Inc.
            17)   Dreyfus Florida Intermediate Municipal Bond Fund
            18)   Dreyfus Florida Municipal Money Market Fund
            19)   The Dreyfus Fund Incorporated
            20)   Dreyfus Global Bond Fund, Inc.
            21)   Dreyfus Global Growth Fund
            22)   Dreyfus GNMA Fund, Inc.
            23)   Dreyfus Government Cash Management
            24)   Dreyfus Growth and Income Fund, Inc.
            25)   Dreyfus Growth and Value Funds, Inc.
            26)   Dreyfus Growth Opportunity Fund, Inc.
            27)   Dreyfus Income Funds
            28)   Dreyfus Institutional Money Market Fund
            29)   Dreyfus Institutional Short Term Treasury Fund
            30)   Dreyfus Insured Municipal Bond Fund, Inc.
            31)   Dreyfus Intermediate Municipal Bond Fund, Inc.
            32)   Dreyfus International Funds, Inc.
            33)   Dreyfus Investment Grade Bond Funds, Inc.
            34)   The Dreyfus/Laurel Funds, Inc.
            35)   The Dreyfus/Laurel Funds Trust
            36)   The Dreyfus/Laurel Tax-Free Municipal Funds
            37)   Dreyfus LifeTime Portfolios, Inc.
            38)   Dreyfus Liquid Assets, Inc.
            39)   Dreyfus Massachusetts Intermediate Municipal Bond Fund
            40)   Dreyfus Massachusetts Municipal Money Market Fund
            41)   Dreyfus Massachusetts Tax Exempt Bond Fund
            42)   Dreyfus MidCap Index Fund
            43)   Dreyfus Money Market Instruments, Inc.
            44)   Dreyfus Municipal Bond Fund, Inc.
            45)   Dreyfus Municipal Cash Management Plus
            46)   Dreyfus Municipal Money Market Fund, Inc.
            47)   Dreyfus New Jersey Intermediate Municipal Bond Fund
            48)   Dreyfus New Jersey Municipal Bond Fund, Inc.
            49)   Dreyfus New Jersey Municipal Money Market Fund, Inc.
            50)   Dreyfus New Leaders Fund, Inc.
            51)   Dreyfus New York Insured Tax Exempt Bond Fund
            52)   Dreyfus New York Municipal Cash Management
            53)   Dreyfus New York Tax Exempt Bond Fund, Inc.
            54)   Dreyfus New York Tax Exempt Intermediate Bond Fund
            55)   Dreyfus New York Tax Exempt Money Market Fund
            56)   Dreyfus 100% U.S. Treasury Intermediate Term Fund
            57)   Dreyfus 100% U.S. Treasury Long Term Fund
            58)   Dreyfus 100% U.S. Treasury Money Market Fund
            59)   Dreyfus 100% U.S. Treasury Short Term Fund
            60)   Dreyfus Pennsylvania Intermediate Municipal Bond Fund
            61)   Dreyfus Pennsylvania Municipal Money Market Fund
            62)   Dreyfus S&P 500 Index Fund
            63)   Dreyfus Short-Intermediate Government Fund
            64)   Dreyfus Short-Intermediate Municipal Bond Fund
            65)   The Dreyfus Socially Responsible Growth Fund, Inc.
            66)   Dreyfus Stock Index Fund, Inc.
            67)   Dreyfus Tax Exempt Cash Management
            68)   The Dreyfus Third Century Fund, Inc.
            69)   Dreyfus Treasury Cash Management
            70)   Dreyfus Treasury Prime Cash Management
            71)   Dreyfus Variable Investment Fund
            72)   Dreyfus Worldwide Dollar Money Market Fund, Inc.
            73)   General California Municipal Bond Fund, Inc.
            74)   General California Municipal Money Market Fund
            75)   General Government Securities Money Market Fund, Inc.
            76)   General Money Market Fund, Inc.
            77)   General Municipal Bond Fund, Inc.
            78)   General Municipal Money Market Fund, Inc.
            79)   General New York Municipal Bond Fund, Inc.
            80)   General New York Municipal Money Market Fund
            81)   Premier Insured Municipal Bond Fund
            82)   Premier California Municipal Bond Fund
            83)   Premier Equity Funds, Inc.
            84)   Premier Global Investing, Inc.
            85)   Premier GNMA Fund
            86)   Premier Growth Fund, Inc.
            87)   Premier Municipal Bond Fund
            88)   Premier New York Municipal Bond Fund
            89)   Premier State Municipal Bond Fund
            90)   Premier Strategic Growth Fund
            91)   Premier Value Fund


(b)
                                                             Positions and
Name and principal        Positions and offices with         offices with
business address          the Distributor                    Registrant
__________________        ___________________________        _____________

Marie E. Connolly+        Director, President, Chief         President and
                          Executive Officer and Compliance   Treasurer
                          Officer

Joseph F. Tower, III+     Senior Vice President, Treasurer   Vice President
                          and Chief Financial Officer        and Assistant
                                                             Treasurer

John E. Pelletier+        Senior Vice President, General     Vice President
                          Counsel, Secretary and Clerk       and Secretary

Roy M. Moura+             First Vice President               None

Dale F. Lampe+             Vice President                    None

Mary A. Nelson+            Vice President                    Vice President
                                                             and Assistant
                                                             Treasurer

Paul Prescott+            Vice President                     None

Elizabeth A. Bachman++    Assistant Vice President           Vice President
                                                             and Assistant
                                                             Secretary

Jean M. O'Leary+          Assistant Secretary and            None
                          Assistant Clerk

John W. Gomez+            Director                           None

William J. Nutt+          Director                           None




________________________________
 +  Principal business address is One Exchange Place, Boston, Massachusetts
02109.
++  Principal business address is 200 Park Avenue, New York, New York 10166.



Item 30.   Location of Accounts and Records
           ________________________________

           1.  First Data Investor Services Group, Inc.,
               a subsidiary of First Data Corporation
               P.O. Box 9671
               Providence, Rhode Island 02940-9671

           2.  The Bank of New York
               90 Washington Street
               New York, New York 10286

           3.  Dreyfus Transfer, Inc.
               P.O. Box 9671
               Providence, Rhode Island 02940-9671

           4.  The Dreyfus Corporation
               200 Park Avenue
               New York, New York 10166

Item 31.   Management Services
_______    ___________________

           Not Applicable

Item 32.   Undertakings
________   ____________

  (1)      To call a meeting of shareholders for the purpose of voting upon
           the question of removal of a Board member or Board members when
           requested in writing to do so by the holders of at least 10% of
           the Registrant's outstanding shares and in connection with such
           meeting to comply with the provisions of Section 16(c) of the
           Investment Company Act of 1940 relating to shareholder
           communications.

  (2)      To furnish each person to whom a prospectus is delivered with a
           copy of the Fund's latest Annual Report to Shareholders, upon
           request and without charge.




                                  SIGNATURES
                                ---------------
   
     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Amendment to the Registration
Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly
caused this Amendment to the Registration Statement to be signed on its behalf
by the undersigned, thereunto duly authorized, in the City of New York, and
State of New York on the 1st day of January, 1997.
    
                    Dreyfus Institutional Short Term Treasury Fund

            BY:     /s/Marie E. Connolly*
                    ___________________________________________
                    Marie E. Connolly, PRESIDENT

          Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, this Amendment to the Registration Statement has
been signed below by the following persons in the capacities and on the dates
indicated.

        Signatures                      Title                          Date
__________________________       _______________________________     _________
   
/s/Marie E. Connolly*            President and Treasurer (Principal  12/24/96
______________________________   Executive, Financial and Accounting
Marie E. Connolly                Officer)
    
   
/s/ Joseph S. DiMartino*         Chairman of the Board               12/24/96
______________________________
Joseph S. DiMartino
    
   
/s/Lucy Wilson Benson*           Trustee                             12/24/96
______________________________
Lucy Wilson Benson
    
   
/s/David W. Burke*               Trustee                             12/24/96
______________________________
David W. Burke
    
   
/s/Martin D. Fife*               Trustee                             12/24/96
______________________________
Martin D. Fife
    
   
/s/Robert R. Glauber*            Trustee                             12/24/96
______________________________
Robert R. Glauber
    
   
/s/Whitney I. Gerard*            Trustee                             12/24/96
______________________________
Whitney I. Gerard
    
   
/s/Arthur A. Hartman*            Trustee                             12/24/96
______________________________
Arthur A. Hartman
    
   
/s/George L. Perry*              Trustee                             12/24/96
______________________________
George L. Perry
    
   
/s/Paul D. Wolfowitz*            Trustee                             12/24/96
______________________________
Paul D. Wolfowitz

    

*BY:      Elizabeth Bachman
          __________________________
          Elizabeth Bachman,
          Attorney-in-Fact


                                 EXHIBIT INDEX

Exhibits

              (11)     Consent of Independent Auditors

              (17)     Financial Data Schedule










                    CONSENT OF INDEPENDENT AUDITORS



We consent to the reference to our firm under the captions "Condensed
Financial Information" and "Transfer and Dividend Disbursing Agent,
Counsel, Custodian, and Independent Auditors" and to the use of
our report dated October 31, 1996, in this Registration Statement
(Form N-1A 33-50379) of Dreyfus Institutional Short-Term Treasury Fund.




                                       ERNST & YOUNG LLP


New York, New York
December 23, 1996



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<NAME> DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
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