DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
485BPOS, 1997-12-31
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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. 5                                   [X]
    

                                   and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940       [X]
   

     Amendment No. 5                                                  [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 15, 1998 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.
     ----

               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 15, 1998
    
               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 15, 1998,
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, A
ND 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.........................            10
          Dividends, Distributions and Taxes................            10
          Performance Information...........................            12
          General Information...............................            12
          Appendix..........................................            14



                               [Page 2]
<TABLE>
<CAPTION>
ANNUAL FUND OPERATING EXPENSES
(as a percentage of average daily net assets)
                                                                                          INSTITUTIONAL              INVESTOR
                                                                                             SHARES                    SHARES
                                                                                           __________                 ________
       <S>                                                                                 <C>                        <C>
        Management Fees ..........................................................            .20%                     .20%
        12b-1 Fees (distribution and servicing)...................................             __                      .25%
        Total Fund Operating Expenses.............................................            .20%                     .45%
</TABLE>
   
<TABLE>
<CAPTION>
      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
                                                                      _____________          ___________
                                                <S>                   <C>                    <C>
                                                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, commitment fees 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. The Fund will not reimburse The
Dreyfus Corporation for any amounts The Dreyfus Corporation may bear. Institut
ions 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. Further financial data, related
notes and the report of independent auditors accompany 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>
<CAPTION>

                                                     INSTITUTIONAL SHARES                        INVESTOR SHARES
                                       _________________________________________    ____________________________________________
                                                   YEAR ENDED SEPTEMBER 30,                 YEAR ENDED SEPTEMBER 30,
                                       _________________________________________    ____________________________________________
PER SHARE DATA:                       1994(2)           1995       1996   1997(1)     1994(2)           1995      1996   1997(1)
                                      _______          ______   _______   _______     _______        _______   _______  _______
  <S>                                 <C>             <C>        <C>      <C>         <C>             <C>      <C>       <C>
  Net asset value, beginning of year   $ 2.00         $ 1.96     $ 1.99    $ 1.98      $ 2.00         $ 1.97    $ 2.00    $ 1.99
                                      _______          ______   _______   _______     _______        _______   _______  _______
  INVESTMENT OPERATIONS:
  Investment income_net.........          .10            .13        .13       .12         .09            .13       .12       .12
  Net realized and unrealized
    gain (loss)
    on investments.................      (.04)           .03       (.01)       __        (.03)           .03      (.01)       __
                                      _______          ______   _______   _______     _______        _______   _______  _______
  TOTAL FROM INVESTMENT OPERATIONS        .06            .16        .12       .12         .06            .16       .11       .12
                                      _______          ______   _______   _______     _______        _______   _______  _______
  DISTRIBUTIONS:
  Dividends from investment
    income _net                          (.10)          (.13)      (.13)     (.12)       (.09)          (.13)     (.12)    (.12)
                                      _______          ______   _______   _______     _______        _______   _______  _______
  Net asset value, end of year...      $ 1.96         $ 1.99     $ 1.98    $ 1.98      $ 1.97         $ 2.00    $ 1.99    $ 1.99
                                     ========        =======    =======    ======     =======         ======   =======    ======
  TOTAL INVESTMENT RETURN ........      3.08%(3)       8.45%      6.03%     6.23%       3.39%(3)       8.17%     5.76%     5.97%
  RATIOS/SUPPLEMENTAL DATA:
  Ratio of operating expenses to
  average net assets..............       .20%(3)        .20%       .20%      .20%        .45%(3)        .45%      .45%      .45%
  Ratio of net investment
    income to
    average net assets....              5.41%(3)       6.48%      6.04%     6.40%    5.01%(3)          6.35%     6.13%     5.83%
  Portfolio Turnover Rate....       4,125.54%(4)   1,926.32%    694.24%   952.81%   4,125.54%(4)   1,926.32%   694.24%   952.81%
  Net Assets, end of year
    (000's omitted)                  $90,421        $160,748   $170,290  $118,102     $23,147..       $5,964   $24,490   $35,296
    
   
(1) Effective February 2, 1997, Class A shares were redesignated as
    Institutional Shares and Class B shares as Investor Shares.
    
   
(2) From October 29, 1993 (commencement of operations) through September 30, 1994.
    
   
(3) Annualized.
    
   
(4) 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
                               [Page 4]

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.
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 31, 1997, The Dreyfus Corporation
managed or administered approximately $94 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
                               [Page 5]

Association, Mellon Bank (MD), The Boston Company, Inc., AFCOCredit
Corporation and a number of companies known as Mellon Financial Services
Corporations. Through its subsidiaries, including The Dreyfus Corporation,
Mellon managed more than $299 billion in assets as of September 30, 1997,
including approximately $102 billion in proprietary mutual fund assets. As of
September 30, 1997, Mellon, through various subsidiaries, provided
non-investment services, such as custodial or administration services, for
more than $1.488 trillion in assets, including approximately $60 billion in
mutual fund assets.
    
   
    
        For the fiscal year ended September 30, 1997, 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.
        In allocating brokerage transactions, 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 State
ment 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, al
though 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 Divi
sion, 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 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 connec
                               [Page 6]

tion with purchases for the accounts of their clients. 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 entity
authorized to receive orders on behalf of the Fund. 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.
        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
                               [Page 7]

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 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 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 or other entity authorized to receive orders
on behalf of the Fund 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 are 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 the investor, and reasonably believed by the
Transfer Agent to be genuine. The Fund will require the
                               [Page 8]

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
                               [Page 9]

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. 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. If investors elect to receive dividends and distributions in
cash, and such dividend or distribution check is returned to the Fund as
undeliverable or remains uncashed for six months, the Fund reserves the right
to reinvest such dividend or distribution and all future dividends and
distributions payable in additional Fund shares at net asset value. No
interest will accrue on amounts represented by uncashed distribution or
redemption checks. 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 an individual generally will be taxed on his or her
net capital gain at a maximum rate of 28% with respect to capital gain from
securities held for more than one year but not more than 18 months and at a
maximum rate of 20% with respect to capital gain from securities held for
more than 18 months. 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.


                               [Page 10]

        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 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 wi
thholding 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, IRS individual taxpayer
identification 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, 1997 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
"annual

                               [Page 11]

ized" 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. 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
                               [Page 12]

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.
        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 purpos
es 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

                                  Managed by
                            The Dreyfus Corporation
Copy Rights 1998 Dreyfus Service Corporation
                                        721/680p0198
                               [Page 16]


   

               DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
                      INSTITUTIONAL AND INVESTOR SHARES
                                   PART B
                    (STATEMENT OF ADDITIONAL INFORMATION)
                              JANUARY 15, 1998
    
   

     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
15, 1998, 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-10
Service Plan (Investor Shares).............................B-11
Shareholder Services Plan (Institutional Shares)...........B-12
Redemption of Shares.......................................B-12
Determination of Net Asset Value...........................B-13
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 and Report of Independent Auditors....B-18
   
    

          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.
    

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 for Security Assistance, Science and Technology.
     She is 69 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 60 years old and his address is 197 Eighth Street, Charleston,
     Massachusetts 02109.
    
   
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
     a director of The Muscular Dystrophy Association, HealthPlan Services
     Corporation, a provider of marketing, administrative and risk
     management services to health and other benefit programs, The Noel
     Group, Inc., a venture capital company, Staffing Resources, Inc., a
     temporary placement agency, Caryle Industries, Inc. (formerly, Belding
     Heminway Company, Inc.), a button packager and distributor, and Century
     Business Services, Inc., a provider of various outsourcing functions by
     small and medium size companies. 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 54 years old and his address is 200 Park Avenue,
     New York, New York 10166.
    
   
MARTIN D. FIFE, Board Member.  Chairman of the Board of Magar, Inc., a
     company specializing in financial products and developing early stage
     companies.  In addition, Mr. Fife is also Chairman of the Board and
     Chief Executive Officer of Skysat Communications Network Corporation, a
     company developing telecommunications systems.  Mr. Fife also serves on
     the boards of various other companies.  He is 69 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 62 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 57 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.  Ambassador Hartman is a director of the Hartford
     Insurance Group, Ford Meter Box Corporation and Lawter International
     and a member of the advisory councils of several other companies,
     research institutes and foundations.  Ambassador Hartman is Chairman of
     First NIS Regional Funds (ING Barings Management) and former President
     of the Harvard Board of Overseers.  He is 70 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 and Federal Realty
     Investment Trust.  He is 62 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 for East Asian and
     Pacific Affairs of the Department of State.  He is a director of
     Hasbro, Inc.  He is 52 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, 1997, 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, 1997, 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                   $ 89,018 (14)

David W. Burke                $2,250                   $232,899 (52)

Joseph S. DiMartino           $2,813                   $517,075 (93)

Martin D. Fife                $2,000                   $ 54,167 (12)

Whitney I. Gerard             $2,250                   $ 59,417 (12)

Robert R. Glauber             $2,250                   $103,549 (10)

Arthur A. Hartman             $2,000                   $ 56,167 (12)

George L. Perry               $2,250                   $ 56,167 (12)

Paul D. Wolfowitz             $2,000                   $ 48,046 (11)
______________________________
(1)  Amount does not include reimbursed expenses for attending Board
     meetings.
(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, Chief Compliance Officer and a director of the Distributor and
     Funds Distributor, Inc., the ultimate parent of which is Boston
     Institutional Group, Inc., and an officer of other investment companies
     advised or administered by the Manager.  She is 40 years old.
    
   
ELIZABETH A. KEELEY, Vice President and Assistant Secretary.  Vice President
     of the Distributor and Funds Distributor, Inc., and an officer of other
     investment companies advised or administered by the Manager.  She has
     been employed by the Distributor since September 1995.  She is 28 years
     old.
    
   
RICHARD W. INGRAM, Vice President and Assistant Treasurer.  Executive Vice
     President of the Distributor and 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 42 years old.
    
   
MARY A. NELSON, Vice President and Assistant Treasurer.  Vice President of
     the Distributor and 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 33 years old.
    
   
JOSEPH F. TOWER, III, Vice President and Assistant Treasurer.  Senior Vice
     President, Treasurer, Chief Financial Officer and a director of the
     Distributor and Funds Distributor, Inc., 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 35 years old.
    
   
DOUGLAS C. CONROY, Vice President and Assistant Secretary.  Assistant Vice
     President 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 & Trust Company.  From December 1991 to March 1993, he
     was employed as a Fund Accountant at The Boston Company, Inc.  He is 28
     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, 1997.
    
   
     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, 1997
Institutional Shares - General Invested Fund/City of Detroit, Finance
Department/Debt Management, 1210 City County Bldg., Detroit, MI 48226 -
28.2680%; Swiss American Securities Inc./Sub A/C # 11657110, 100 Wall St.,
New York, NY 10005-3701 - 13.6338%; C F Industries Inc., 1 Salem Lake Dr.,
Long Grove, IL 60047-8401 - 12.9393%; Insureco Agency & Insurance Services,
Inc., Attn. Ruby Hui, 333 S. Anita Dr., Orange CA, 92868-3320; Novonyx Inc.,
Attn. Steven W. Bentley, PO Box 2060, Orem UT 84059-2060  36.8553%; Investor
Shares - Capital Network Services, Attn. Donna Howell, 1 Bush St. Suite 11,
San Francisco, CA 94104-4425 - 15.0144%; CGR Management Corporation, Attn.
Dave Sevig, PO box 11448, 5500 Village Boulevard, West Palm Beach, FL 33419-
1448 - 8.5929%; National Bank of Indianapolis, Attn. John Thomason, Trust
Operations, 107 W. Pennsylvania St., Ste 700, Indianapolis, IN 46204-2423 -
7.8424A%; Firmage Financial Group, Inc., Attn., Dough Holladay, 4731 South
State Street, Salt Lake City, UT 84107 - 6.1591%.  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 January 30, 1997.  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; William T. Sandalls, Jr.,
Senior Vice President and Chief Financial Officer; 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 System; William V. Healy,
Assistant Secretary; and Mandell L. Berman, Burton C. Borgelt, Frank V.
Cahouet, and Richard F. Syron, 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
Michael Hoeh, Roger E. King, Kevin M. McClintock; C. Matthew Olson 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 and for other funds advised by the
Manager.
    


     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 fiscal years ended
September 30, 1995, 1996 and 1997, the management fees paid by the Fund
amounted to $186,965, $468,699 and $295,043, 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, commitment
fees 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.

     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 January 30, 1997.  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, 1997, the Fund paid $45,740
(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 approved by
the Board at a meeting held on November 7, 1997.  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, 1997, 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, telephone or letter 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, Martin Luther King, Jr. 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, 1997.  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, 1997, the Fund's current
yield was 5.67% for Institutional Shares and 5.42% 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 3.92 year periods, the Fund's average annual total return
for Institutional Shares was 6.23% and 5.99%, respectively.  The Fund's
average annual total return for Investor Shares for the same periods was
5.97% and 5.86%, 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, 1997, was 25.62% for Institutional
Shares and 25.02% 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.  The Bank of New York, 90 Washington Street, New York,
New York 10286, acts as custodian of the Fund's investments.
   

     Stroock & Stroock & Lavan LLP, 180 Maiden Lane, New York, New York
10038-4982, 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.


   
           FINANCIAL STATEMENTS AND REPORT OF INDEPENDENT AUDITORS

     The Funds' Annual Report to Shareholders for the fiscal year ended
September 30, 1997 is a separate document supplied with this Statement of
Additional Information, and the financial statements, accompanying notes,
and report of independent auditors appearing therein are incorporated by
reference into this Statement of Additional Information.
    


               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, 1997.
    

                         Included in Part B of the Registration Statement:
   

                    Statement of Investments-- September 30, 1997.
    
   
                    Statement of Assets and Liabilities--September 30, 1997.
    
   
                     Statement of Operations--year ended September 30, 1997.
    
   
                    Statement of Changes in Net Assets--for each of the two
                    years ended September 30, 1996 and 1997.
    


                    Notes to Financial Statements.
   


                    Report of Ernst & Young LLP, Independent Auditors, dated
                    November 4, 1997.
    


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.

                 (b)  Certificate of Secretary.

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, 1997
        ______________                 ______________________________

        Shares of Beneficial Interest
        (Par value $.001)
        Institutional Shares                         66
        Investor Shares                              36

    


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.

BURTON C. BORGELT             Chairman Emeritus of the Board and
Director                      Past Chairman, Chief Executive Officer and
                              Director:
                                   Dentsply International, Inc.
                                   570 West College Avenue
                                   York, Pennsylvania 17405;
                              Director:
                                   DeVlieg-Bullard, Inc.
                                   1 Gorham Island
                                   Westport, Connecticut 06880
                                   Mellon Bank Corporation***;
                                   Mellon Bank, N.A.***

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

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 Officer:
and a Director                     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****

RICHARD F. SYRON              Chairman of the Board and
Director                      Chief Executive Officer:
                                   American Stock Exchange
                                   86 Trinity Place
                                   New York, New York 10006;
                              Director:
                                   John Hancock Mutual Life Insurance Company
                                   John Hancock Place, Box 111
                                   Boston, Massachusetts, 02117;
                                   Thermo Electron Corporation
                                   81 Wyman Street, Box 9046
                                   Waltham, Massachusetts 02254-9046;
                                   American Business Conference
                                   1730 K Street, NW, Suite 120
                                   Washington, D.C. 20006;
                              Trustee:
                                   Boston College - Board of Trustees
                                   140 Commonwealth Ave.
                                   Chestnut Hill, Massachusetts 02167-3934

WILLIAM T. SANDALLS, JR.      Director:
Senior Vice President and          Dreyfus Partnership Management, Inc.*;
Chief Financial Officer            Seven Six Seven Agency, Inc.*;
                              Chairman and Director:
                                   Dreyfus Transfer, Inc.
                                   One American Express Plaza
                                   Providence, Rhode Island 02903
                              President and Director:
                                   Lion Management, Inc.*;
                              Executive Vice President and Director:
                                   Dreyfus Service Organization, Inc.*;
                              Vice President, Chief Financial Officer and
                              Director:
                                   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 Service Corporation*;
                              Formerly, President and Director:
                                   Sandalls & Co., Inc.

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

WILLIAM V. HEALEY             President:
Assistant Secretary                The Truepenny Corporation*;
                              Vice President and Director:
                                   The Dreyfus Consumer Credit Corporation*;
                              Secretary and Director:
                                   Dreyfus Partnership Management Inc.*;
                              Director:
                                   The Dreyfus Trust Company++;
                              Assistant Secretary:
                                   Dreyfus Service Corporation*;
                                   Dreyfus Investment Advisors, Inc.*;
                              Assistant Clerk:
                                   Dreyfus Insurance Agency of Massachusetts,
                                   Inc.+++++

______________________________________

*      The address of the business so indicated is 200 Park Avenue, New York,
       New York 10166.
**     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.
+++    The address of the business so indicated is 69, Route `d'Esch, L-
       1470 Luxembourg.
++++   The address of the business so indicated is 69, Route `d'Esch, L-
       2953 Luxembourg.
+++++  The address of the business so indicated is 53 State Street, Boston,
       Massachusetts 02103.
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 Premier California Municipal Bond Fund
    63)    Dreyfus Premier Equity Funds, Inc.
    64)    Dreyfus Premier International Growth Fund, Inc.
    65)    Dreyfus Premier GNMA Fund
    66)    Dreyfus Premier Worldwide Growth Fund, Inc.
    67)    Dreyfus Premier Insured Municipal Bond Fund
    68)    Dreyfus Premier Municipal Bond Fund
    69)    Dreyfus Premier New York Municipal Bond Fund
    70)    Dreyfus Premier State Municipal Bond Fund
    71)    Dreyfus Premier Value Fund
    72)    Dreyfus Index Funds, Inc.
    73)    Dreyfus Short-Intermediate Government Fund
    74)    Dreyfus Short-Intermediate Municipal Bond Fund
    75)    The Dreyfus Socially Responsible Growth Fund, Inc.
    76)    Dreyfus Stock Index Fund, Inc.
    77)    Dreyfus Tax Exempt Cash Management
    78)    The Dreyfus Third Century Fund, Inc.
    79)    Dreyfus Treasury Cash Management
    80)    Dreyfus Treasury Prime Cash Management
    81)    Dreyfus Variable Investment Fund
    82)    Dreyfus Worldwide Dollar Money Market Fund, Inc.
    83)    General California Municipal Bond Fund, Inc.
    84)    General California Municipal Money Market Fund
    85)    General Government Securities Money Market Fund, Inc.
    86)    General Money Market Fund, Inc.
    87)    General Municipal Bond Fund, Inc.
    88)    General Municipal Money Market Fund, Inc.
    89)    General New York Municipal Bond Fund, Inc.
    90)    General New York Municipal Money Market 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+    Director, Senior Vice President,   Vice President
                    Tresurer and Chief Financial Officer    and Assistant
                                                            Treasurer

Richard W. Ingram   Executive Vice President                Vice President
                                                            and Assistant
                                                            Treasurer

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

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

Paul Prescott+      Vice President                          None

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

John W. Gomez+      Director                               None

William J. Nutt+    Director                               None




________________________________
 +  Principal business address is 60 State Street, 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 file a post-effective amendment, using financial statements
           which need not be certified, within four to six months from the
           effective date of Registrant's 1933 Act Registration Statement
           with respect to the Registrant's Dreyfus Technology Growth Fund.

  (2)      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.

  (3)      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 31st day of December, 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,  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            12/31/97
______________________________  (Principal Executive Officer)
Marie E. Connolly
    
   
/s/Joseph F. Tower,   III*       Assistant Treasurer (Principal     12/31/97
_____________________________   Financial and Accounting Officer)
Joseph F. Tower, III
    
   
/s/Joseph S.DiMartino*            Chairman of the Board             12/31/97
______________________________
Joseph S. DiMartino
    
   
/s/Lucy Wilson Benson*             Trustee                          12/31/97
_____________________________
Lucy Wilson Benson

/s/David W. Burke*                 Trustee                          12/31/97
_____________________________
David W. Burke

/s/Martin D. Fife*                 Trustee                          12/31/97
_____________________________
Martin D. Fife

/s/Robert R. Glauber*                        Trustee 12/31/97
_____________________________
Robert R. Glauber

/s/Whitney             I.             Gerard*                        Trustee
12/31/97
_____________________________
Whitney I. Gerard

/s/Arthur             A.             Hartman*                        Trustee
12/31/97
_____________________________
Arthur A. Hartman

/s/George L. Perry*                                                  Trustee
12/31/97
_____________________________
George L. Perry

/s/Paul              D.             Wolfowitz*                       Trustee
12/31/97
_____________________________
Paul D. Wolfowitz


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


               DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND


                              INDEX OF EXHIBITS




          (11)      Consent of Independent Auditors

          (17)      Financial Data Schedule



                    Other Exhibits

                    (a)  Powers of Attorney

                    (b)  Certificate of Secretary



    



                    CONSENT OF INDEPENDENT AUDITORS



We consent to the reference to our firm under the captions "Condensed
Financial Information" and "Transfer and Dividend Disbursing Agent,
Custodian, Counsel and Independent Auditors" and to the use of
our report on Dreyfus Institutional Short Term Treasury Fund dated
November 4, 1997, incorporated by reference in this Registration
Statement (Form N-1A No. 33-50379).


                                       ERNST & YOUNG LLP


New York, New York
December 31, 1997

 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000912492
<NAME> DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
<SERIES>
   <NUMBER> 001
   <NAME> INSTITUTIONAL SHARES - CLASS A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               SEP-30-1997
<INVESTMENTS-AT-COST>                           149793
<INVESTMENTS-AT-VALUE>                          149936
<RECEIVABLES>                                     2895
<ASSETS-OTHER>                                     707
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  153538
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          140
<TOTAL-LIABILITIES>                                140
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        156802
<SHARES-COMMON-STOCK>                            59670
<SHARES-COMMON-PRIOR>                            85894
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (3547)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                           143
<NET-ASSETS>                                    118102
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 9211
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     341
<NET-INVESTMENT-INCOME>                           8870
<REALIZED-GAINS-CURRENT>                         (311)
<APPREC-INCREASE-CURRENT>                          272
<NET-CHANGE-FROM-OPS>                             8831
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (7804)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          30764
<NUMBER-OF-SHARES-REDEEMED>                    (59535)
<SHARES-REINVESTED>                               2546
<NET-CHANGE-IN-ASSETS>                         (41382)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       (3236)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              295
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    341
<AVERAGE-NET-ASSETS>                            129226
<PER-SHARE-NAV-BEGIN>                             1.98
<PER-SHARE-NII>                                    .12
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                             (.12)
<PER-SHARE-DISTRIBUTIONS>                         .000
<RETURNS-OF-CAPITAL>                              .000
<PER-SHARE-NAV-END>                               1.98
<EXPENSE-RATIO>                                   .002
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000912492
<NAME> DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
<SERIES>
   <NUMBER> 002
   <NAME> INVESTOR SHARES - CLASS B
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               SEP-30-1997
<INVESTMENTS-AT-COST>                           149793
<INVESTMENTS-AT-VALUE>                          149936
<RECEIVABLES>                                     2895
<ASSETS-OTHER>                                     707
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  153538
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          140
<TOTAL-LIABILITIES>                                140
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        156802
<SHARES-COMMON-STOCK>                            17716
<SHARES-COMMON-PRIOR>                            12298
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (3547)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                           143
<NET-ASSETS>                                     35296
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 9211
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     341
<NET-INVESTMENT-INCOME>                           8870
<REALIZED-GAINS-CURRENT>                         (311)
<APPREC-INCREASE-CURRENT>                          272
<NET-CHANGE-FROM-OPS>                             8831
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1066)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          18165
<NUMBER-OF-SHARES-REDEEMED>                    (13223)
<SHARES-REINVESTED>                                475
<NET-CHANGE-IN-ASSETS>                         (41382)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       (3236)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              295
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    341
<AVERAGE-NET-ASSETS>                             18296
<PER-SHARE-NAV-BEGIN>                             1.99
<PER-SHARE-NII>                                    .12
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                             (.12)
<PER-SHARE-DISTRIBUTIONS>                         .000
<RETURNS-OF-CAPITAL>                              .000
<PER-SHARE-NAV-END>                               1.99
<EXPENSE-RATIO>                                   .005
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>



J35-036-106-gr-5(mw)
                                                                 Item 24.(b)
                                                          Other Exhibits (a)

                             POWER OF ATTORNEY

     The undersigned hereby constitute and appoint Elizabeth A. Keeley,
Marie E. Connolly, Richard W. Ingram, Mark A. Karpe and John E. Pelletier
and each of them, with full power to act without the other, his or her true
and lawful attorney-in-fact and agent, with full power of substitution and
resubstitution, for him or her and in his or her name, place and stead, in
any and all capacities (until revoked in writing) to sign any and all
amendments to the Registration Statement of Dreyfus institutional Short Term
Treasury Fund(including post-effective amendments and amendments thereto),
and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, granting
unto said attorneys-in-fact and agents, and each of them, full power and
authority to do and perform each and every act and thing ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or
their or his or her substitute or substitutes, may lawfully do or cause to
be done by virtue hereof.

/s/Clifford L. Alexander, Jr.                               November 7, 1996
- --------------------------------
Clifford L. Alexander, Jr.

/s/Peggy C. Davis                                           November 7, 1996
- --------------------------------
Peggy C. Davis

/s/Joseph S. DiMartino                                      November 7, 1996
- --------------------------------
Joseph S. DiMartino

/s/Ernst Kafka                                              November 7, 1996
- --------------------------------
Ernst Kafka

/s/Saul B. Klaman                                           November 7, 1996
- --------------------------------
Saul B. Klaman

/s/Nathan Leventhal                                         November 7, 1996
- --------------------------------
Nathan Leventhal





J34-036-106-gr-5(mw)


                                                                  ITEM 24.(b)
                                                            OTHER EXHIBIT (b)

               DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND

                     Certificate of Assistant Secretary

     The undersigned, Elizabeth A. Keeley, Vice President and Assistant
Secretary of Dreyfus Institutional Short Term Treasury Fund(the "Fund"),
hereby certifies that set forth below is a copy of the resolution adopted by
the Fund's Board authorizing the signing by Elizabeth A. Keeley, Marie E.
Connolly, Richard W. Ingram, Mark A. Karpe and John Pelletier on behalf of
the proper officers of the Fund pursuant to a power of attorney:

               RESOLVED, that the Registration Statement and any
          and all amendments and supplements thereto, may be
          signed by any one of Elizabeth A. Keeley, Marie E.
          Connolly, Richard W. Ingram, Mark A. Karpe and John
          Pelletier as the attorney-in-fact for the proper
          officers of the Fund, with full power of substitution
          and resubstitution; and that the appointment of each of
          such persons as such attorney-in-fact hereby is
          authorized and approved; and that such attorneys-in-
          fact, and each of them, shall have full power and
          authority to do and perform each and every act and thing
          requisite and necessary to be done in connection with
          such Registration Statement and any and all amendments
          and supplements thereto, as fully to all intents and
          purposes as the officer, for whom he or she is acting as
          attorney-in-fact, might or could do in person.

          IN WITNESS WHEREOF, I have hereunto signed my name and affixed the
seal of the Fund on December 31, 1997.


                                                  /s/Elizabeth A. Keeley
                                                  -----------------------
                                                  Elizabeth A. Keeley
                                                  Vice President and
Assistant Secretary




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