DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
N-30D, 2000-06-09
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Dreyfus
Institutional Short
Term Treasury Fund

SEMIANNUAL REPORT
March 31, 2000

(reg.tm)





The  views  expressed herein are current to the date of this report. These views
and  the  composition  of the fund's portfolio are subject to change at any time
based on market and other conditions.

           * Not FDIC-Insured * Not Bank-Guaranteed * May Lose Value


                                 Contents

                                 THE FUND
--------------------------------------------------

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Statement of Investments

                             7   Statement of Assets and Liabilities

                             8   Statement of Operations

                             9   Statement of Changes in Net Assets

                            11   Financial Highlights

                            13   Notes to Financial Statements

                                 FOR MORE INFORMATION
---------------------------------------------------------------------------

                                 Back Cover

                                                                       The Fund

                                                          Dreyfus Institutional
                                                       Short Term Treasury Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We are pleased to present this semiannual report for Dreyfus Institutional Short
Term  Treasury  Fund, covering the six-month period from October 1, 1999 through
March  31, 2000. Inside, you'll find valuable information about how the fund was
managed  during  the  reporting  period,  including  a discussion with Gerald E.
Thunelius,  portfolio  manager  and a member of the Dreyfus Taxable Fixed Income
Team that manages the fund.

Tighter  monetary  policy represented the most significant influence on the bond
market  over  the past six months. This was primarily a result of efforts by the
Federal  Reserve  Board  to  forestall  a potential re-emergence of inflationary
pressures.  The  Federal  Reserve  raised  short-term interest rates three times
during  the  reporting  period, following two interest-rate hikes implemented in
the  months  before  the  reporting  period  began. Since June 1999, the Federal
Reserve Board has raised short-term interest rates a total of 125 basis points.

Higher  interest rates led to some additional erosion of bond prices, especially
during  the  fourth  quarter of 1999. During the first quarter of 2000, however,
some  bonds  began  to  rally,  led higher by long-term U.S. Treasury securities
which  rose primarily because of reduced supply amid robust demand from domestic
and foreign investors.

We  appreciate  your confidence over the past six months, and we look forward to
your continued participation in Dreyfus Institutional Short Term Treasury Fund.

Sincerely,

/s/ Stephen E. Canter
Stephen E. Canter

President and Chief Investment Officer

The Dreyfus Corporation

April 12, 2000




DISCUSSION OF FUND PERFORMANCE

Gerald E. Thunelius, Portfolio Manager Dreyfus Taxable Fixed Income Team

How did Dreyfus Institutional Short Term Treasury Fund perform relative to its
benchmark?

For  the six-month period ended March 31, 2000, the fund produced a total return
of  1.77%  for  Institutional  shares  and  a total return of 1.65% for Investor
shares.(1) This compares with the total return provided by the fund's benchmark,
the  Merrill  Lynch  Governments,  U.S.  Treasury, Short-Term (1-3 Years) Index,
which    produced   a   1.86%   total   return   for   the   same   period.(2)

We  attribute the fund's performance to rising interest rates and the low yields
provided  by  short-term  U.S.  Treasury  securities  compared to other types of
bonds.  We  attribute  the  fund's relative underperformance to its conservative
investment  policies,  which  limit  the  portfolio's  maximum average weighted
maturity  to  two years. In contrast, our benchmark includes Treasury securities
with  maturities  of as much as three years, which tend to provide incrementally
higher returns, especially during market rallies.

What is the fund's investment approach?

The  fund  seeks  to  provide  a  high  level  of  current  income  with minimum
fluctuation  of  principal.  To  pursue  this goal, the fund purchases only U.S.
Treasury  securities, and may enter into repurchase agreements collateralized by
such securities. To help minimize fluctuations of principal, the fund will limit
the  remaining maturities of the Treasury securities it purchases to three years
or  less  and  its  repurchase agreements to those that mature the next business
day. The portfolio's dollar-weighted average maturity does not exceed two years.

                                                             The Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

What other factors influenced the fund's performance?

Despite  a rally among long-term U.S. Treasury bonds during the first quarter of
2000,  the  portfolio's  performance  was  adversely  affected  by  a difficult
investment environment during the reporting period.

When  the  reporting  period  began  on  October  1,  1999, investors had become
concerned  that  strong economic growth might rekindle long-dormant inflationary
pressures. In an attempt to forestall a reacceleration of inflation, the Federal
Reserve  Board raised short-term interest rates three times during the reporting
period  --  in November, February and March -- causing most bond prices to fall.
These  interest-rate  hikes  followed two previous increases implemented in June
and  August,  before the current reporting period began, for a total increase of
125  basis points since last summer. A more restrictive monetary policy produced
higher  yields  and  lower  prices  for  most  sectors  of the U.S. fixed-income
marketplace, including short-term U.S. Treasury securities.

However, some U.S. Treasury securities responded differently to these influences
than  most  other  bonds.  Their  own unique supply-and-demand influences helped
longer  term  Treasury securities to perform better on a total return basis than
higher yielding securities of comparable maturity, including corporate bonds and
U.S.  government  agency  securities. That's because the U.S. Treasury announced
that  it  intended  to  begin  buying  back  longer term, higher yielding bonds,
effectively  reducing  the supply of U.S. Treasury bonds amid robust demand from
domestic    and    foreign    investors.

The  long  bond rallied strongly on this news while shorter term notes and bills
continued  to  decline,  causing  the  U.S. Treasury yield curve to invert -- an
unusual  condition  in  which  short-  and  intermediate-term securities provide
higher    yields    than    long-term    securities.


What is the fund's current strategy?

We  have  continued  to  maintain  a defensive strategy for the fund in a rising
interest-rate  environment. The fund's average duration remained near 1.35 years
throughout  the  six-month  reporting  period,  well  below  the fund's two-year
maximum.  This  relatively  short duration helped boost performance by giving us
greater  flexibility  when  yields  of  short-term U.S. Treasury bills and notes
rose.

Toward   the   end   of  the  reporting  period,  we  deployed  some  assets  to
inflation-indexed  U.S.  Treasury  securities,  known  as  TIPS.  Because  these
securities'  principal  adjusts with the rate of inflation, they tend to perform
particularly well in strong economic environments such as the one that currently
prevails.

April 12, 2000

(1)  TOTAL RETURN INCLUDES REINVESTMENT OF DIVIDENDS AND ANY CAPITAL GAINS PAID.
     PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. SHARE PRICE, YIELD AND
     INVESTMENT RETURN FLUCTUATE SUCH THAT UPON REDEMPTION, FUND SHARES MAY BE
     WORTH MORE OR LESS THAN THEIR ORIGINAL COST.

(2)  SOURCE: BLOOMBERG L.P. -- REFLECTS THE REINVESTMENT OF DIVIDENDS AND, WHERE
     APPLICABLE, CAPITAL GAIN DISTRIBUTIONS. THE MERRILL LYNCH GOVERNMENTS, U.S.
     TREASURY, SHORT-TERM (1-3 YEARS) INDEX IS AN UNMANAGED PERFORMANCE
     BENCHMARK FOR TREASURY SECURITIES WITH MATURITIES OF 1-3 YEARS; ISSUES IN
     THE INDEX MUST HAVE PAR AMOUNTS OUTSTANDING GREATER THAN OR EQUAL TO
     $1 BILLION.

                                                             The Fund
<TABLE>
<CAPTION>

STATEMENT OF INVESTMENTS

March 31, 2000 (Unaudited)

                                                                                              Principal
BONDS AND NOTES--105.4%                                                                      Amount ($)                Value ($)
------------------------------------------------------------------------------------------------------------------------------------

U.S. TREASURY INFLATION PROTECTION SECURITIES-12.9%

<S>                                                                                           <C>                      <C>
   3.625%, 7/15/2002                                                                          5,000,000  (a)           5,254,031

U.S. TREASURY NOTES--81.8%

   5.5%, 7/31/2001                                                                            2,500,000                2,470,300

   5.5%, 8/31/2001                                                                            5,000,000                4,936,050

   5.75%, 6/30/2001                                                                           3,000,000                2,975,310

   5.875%, 10/31/2001                                                                         3,000,000                2,972,610

   5.875%, 11/30/2001                                                                         4,000,000                3,960,840

   6%, 7/31/2002                                                                              1,000,000                  990,310

   6.125%, 12/31/2001                                                                         2,000,000                1,987,900

   6.375%, 1/31/2002                                                                          2,000,000                1,995,180

   6.5%, 2/28/2002                                                                            7,000,000                7,000,630

   6.5%, 5/31/2002                                                                            4,000,000                4,001,120

                                                                                                                      33,290,250

U.S. TREASURY PRINCIPAL STRIPS--10.7%

   Zero Coupon, 5/15/2002                                                                     5,000,000                4,368,250

TOTAL BONDS AND NOTES

   (cost $43,171,289)                                                                                                 42,912,531
------------------------------------------------------------------------------------------------------------------------------------

SHORT-TERM INVESTMENTS--3.9%
------------------------------------------------------------------------------------------------------------------------------------

REPURCHASE AGREEMENTS;

UBS Securities, 6.1%

  dated 3/31/2000, due 4/3/2000 in the amount of $1,610,818

  (fully collateralized by $1,650,000 U.S. Treasury Bills,

  4/18/2000 , value $1,642,575)

   (cost $1,610,000)                                                                          1,610,000                1,610,000
------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $44,781,289)                                                             109.3%               44,522,531

LIABILITIES, LESS CASH AND RECEIVABLES                                                            (9.3%)              (3,800,863)

NET ASSETS                                                                                       100.0%               40,721,668

(a) PRINCIPAL AMOUNT FOR ACCRUAL PURPOSES IS PERIODICALLY ADJUSTED BASED ON CHANGES TO THE CONSUMER PRICE INDEX.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>


STATEMENT OF ASSETS AND LIABILITIES

March 31, 2000 (Unaudited)

                                                             Cost          Value
--------------------------------------------------------------------------------

ASSETS ($):

Investments in securities--See Statement of
   Investments--Note 1(b)                              44,781,289    44,522,531

Receivable for investment securities sold                             4,002,431

Interest receivable                                                     485,558

Receivable for shares of Beneficial Interest subscribed                  83,000

                                                                     49,093,520
--------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                             6,897

Due to Distributor                                                        2,447

Cash overdraft due to Custodian                                          54,839

Payable for investment securities purchased                           8,089,679

Payable for shares of Beneficial Interest redeemed                      217,990

                                                                      8,371,852
--------------------------------------------------------------------------------

NET ASSETS ($)                                                       40,721,668
--------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                      44,812,098

Accumulated net realized gain (loss) on investments                  (3,831,672)

Accumulated net unrealized appreciation (depreciation)
  on investments--Note 4                                               (258,758)
--------------------------------------------------------------------------------

NET ASSETS ($)                                                       40,721,668

NET ASSET VALUE PER SHARE

                                          Institutional Shares  Investor Shares
--------------------------------------------------------------------------------

Net Assets ($)                                      29,184,295       11,537,373

Shares Outstanding                                  15,047,135        5,914,861
--------------------------------------------------------------------------------

NET ASSET VALUE PER SHARE ($)                            1.94              1.95

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

STATEMENT OF OPERATIONS

Six Months Ended March 31, 2000 (Unaudited)

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

INVESTMENT INCOME ($):

INTEREST INCOME                                                      1,222,320

EXPENSES:

Management fee--Note 3(a)                                               42,364

Distribution fees (Investor Shares)--Note 3(b)                          15,122

Loan commitment fees--Note 2                                               262

TOTAL EXPENSES                                                          57,748

INVESTMENT INCOME--NET                                               1,164,572
--------------------------------------------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS--NOTE 4 ($):

Net realized gain (loss) on investments                               (415,231)

Net unrealized appreciation (depreciation) on investments             (125,718)

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS                (540,949)

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                   623,623

SEE NOTES TO FINANCIAL STATEMENTS


STATEMENT OF CHANGES IN NET ASSETS

                                         Six Months Ended
                                           March 31, 2000          Year Ended
                                              (Unaudited)  September 30, 1999
--------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                          1,164,572           3,461,211

Net realized gain (loss) on investments          (415,231)           (605,246)

Net unrealized appreciation (depreciation)
   on investments                                (125,718)         (1,016,374)

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                      623,623           1,839,591
--------------------------------------------------------------------------------


DIVIDENDS TO SHAREHOLDERS FROM ($):

Investment income--net:

Institutional Shares                             (843,466)          (2,848,674)

Investor Shares                                  (321,106)            (612,537)

TOTAL DIVIDENDS                                (1,164,572)          (3,461,211)
--------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($):

Net proceeds from shares sold:

Institutional Shares                            2,814,370           11,174,934

Investor Shares                                 2,154,139           10,873,127

Dividends reinvested:

Institutional Shares                              494,728            1,537,269

Investor Shares                                   286,554              474,861

Cost of shares redeemed:

Institutional Shares                           (5,601,616)         (44,681,614)

Investor Shares                                (5,388,562)          (6,713,129)

INCREASE (DECREASE) IN NET ASSETS FROM
   BENEFICIAL INTEREST TRANSACTIONS            (5,240,387)         (27,334,552)

TOTAL INCREASE (DECREASE) IN NET ASSETS        (5,781,336)         (28,956,172)
--------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of Period                            46,503,004           75,459,176

END OF PERIOD                                  40,721,668           46,503,004

                                                             The Fund

STATEMENT OF CHANGES IN NET ASSETS (CONTINUED)

                                         Six Months Ended
                                           March 31, 2000          Year Ended
                                              (Unaudited)  September 30, 1999
--------------------------------------------------------------------------------

CAPITAL SHARE TRANSACTIONS:

INSTITUTIONAL SHARES

Shares sold                                     1,447,859           5,642,770

Shares issued for dividends reinvested            254,400             775,200

Shares redeemed                                (2,880,410)        (22,600,748)

NET INCREASE (DECREASE) IN SHARES OUTSTANDING  (1,178,151)        (16,182,778)

INVESTOR SHARES

Shares sold                                     1,100,211           5,446,533

Shares issued for dividends reinvested            146,438             238,378

Shares redeemed                                (2,746,510)         (3,357,193)

NET INCREASE (DECREASE) IN SHARES OUTSTANDING  (1,499,861)          2,327,718

SEE NOTES TO FINANCIAL STATEMENTS.

<TABLE>
<CAPTION>

FINANCIAL HIGHLIGHTS

The  following  tables  describe  the  performance  for each share class for the
fiscal  periods  indicated.  All  information  (except  portfolio turnover rate)
reflects  financial results for a single fund share. Total return shows how much
your  investment  in  the  fund  would have increased (or decreased) during each
period,  assuming  you  had  reinvested  all  dividends and distributions. These
figures have been derived from the fund's financial statements.

                                          Six Months Ended
                                            March 31, 2000                     Year Ended September 30,
                                                                       -----------------------------------------

INSTITUTIONAL SHARES                            (Unaudited)      1999       1998       1997(a)      1996        1995
------------------------------------------------------------------------------------------------------------------------------------

PER SHARE DATA ($):

Net asset value, beginning
<S>                                                  <C>         <C>        <C>         <C>         <C>         <C>
   of period                                         1.96        2.01       1.98        1.98        1.99        1.96

Investment Operations:

Investment income--net                                .05         .11        .12         .12         .13         .13

Net realized and
   unrealized gain (loss)
   on investments                                    (.02)       (.05)       .03          --        (.01)        .03

Total from Investment
   Operations                                         .03         .06        .15         .12         .12         .16

Distributions:

Dividends from investment
   income--net                                       (.05)       (.11)      (.12)       (.12)       (.13)       (.13)

Net asset value,
   end of period                                     1.94        1.96       2.01        1.98        1.98        1.99
-----------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                                     3.53(b)     2.92       7.56        6.23        6.03        8.45
------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                 .20(b)      .20        .20         .20         .20         .20

Ratio of net investment
   income to average
   net assets                                        5.56(b)     5.39       5.81        6.04        6.40        6.48

Portfolio Turnover Rate                            476.08(c)   823.06     756.50      952.81      694.24    1,926.32
----------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period
   ($x1,000)                                        29,184     31,860     65,163     118,102     170,290     160,748

(a) EFFECTIVE FEBRUARY 2, 1997, CLASS A SHARES WERE REDESIGNATED AS INSTITUTIONAL SHARES.

(b) ANNUALIZED.

(c) NOT ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

FINANCIAL HIGHLIGHTS (continued)
                                          Six Months Ended
                                            March 31, 2000                     Year Ended September 30,
                                                                       -----------------------------------------

INVESTOR SHARES                                 (Unaudited)      1999       1998       1997(a)      1996        1995
-----------------------------------------------------------------------------------------------------------------------------

PER SHARE DATA ($):

Net asset value, beginning
   of period                                          1.97       2.02       1.99        1.99        2.00        1.97

Investment Operations:

Investment income--net                                 .05        .10        .11         .12         .12         .13

Net realized and
   unrealized gain (loss)
   on investments                                    (.02)       (.05)       .03           -        (.01)        .03

Total from Investment Operations                      .03         .05        .14         .12         .11         .16

Distributions:

Dividends from investment
   income--net                                       (.05)       (.10)      (.11)       (.12)       (.12)       (.13)

Net asset value, end of period                       1.95        1.97       2.02        1.99        1.99        2.00
----------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                                     3.29(b)     2.68       7.30        5.97        5.76        8.17
----------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                 .45(b)      .45        .45         .45         .45         .45

Ratio of net investment
   income to average
   net assets                                        5.29(b)     5.16       5.57        5.83        6.13        6.35

Portfolio Turnover Rate                            476.08(c)   823.06     756.50      952.81      694.24    1,926.32
----------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period
   ($x1,000)                                        11,537     14,643     10,296      35,296      24,490       5,964

(a) EFFECTIVE FEBRUARY 2, 1997, CLASS B SHARES WERE REDESIGNATED AS INVESTOR SHARES.

(b) ANNUALIZED.

(c) NOT ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>


NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--Significant Accounting Policies:

Dreyfus  Institutional Short Term Treasury Fund (the "fund") is registered under
the  Investment  Company  Act  of 1940, as amended (the "Act"), as a diversified
open-end  management  investment  company. The fund's investment objective is to
provide  investors  with a high level of current income with minimum fluctuation
of principal value. The Dreyfus Corporation (the "Manager") serves as the fund's
investment  adviser.  The  Manager  is  a direct subsidiary of Mellon Bank, N.A.
("Mellon"), which is a wholly-owned subsidiary of Mellon Financial Corporation.

Effective  March  22,  2000,  Dreyfus  Service  Corporation  ("DSC"), became the
distributor  of  the fund's shares, which are sold without a sales charge. Prior
to  March  22,  2000, Premier Mutual Fund Services, Inc., was the distributor of
the  fund's shares. The fund is authorized to issue an unlimited number of $.001
par  value  shares  in the following classes of shares: Institutional Shares and
Investor  Shares. Investor Shares are subject to a Service Plan adopted pursuant
to  Rule  12b-1 under the Act. Other differences between the classes include the
services  offered  to  and  the  expenses borne by each class and certain voting
rights.

The  fund's  financial  statements  are  prepared  in accordance with generally
accepted accounting principles which may require the use of management estimates
and assumptions. Actual results could differ from those estimates.

(a)   Portfolio  valuation:  Investments  in  securities  (excluding  short-term
investments  other  than U.S. Treasury Bills) are valued each business day by an
independent  pricing  service  ("Service") approved  by the Board  of  Trustees.
Investments   for  which  quoted  bid  prices  are  readily  available  and  are
representative  of the bid side of the market in the judgment of the Service are
valued  at  the  mean  between the quoted bid prices (as obtained by the Service
from  dealers in such securities) and asked prices (as calculated by the Service
based  upon its evaluation of the market for such securities). Other investments
are

                                                             The Fund

NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

carried  at  fair  value  as  determined  by the Service, based on methods which
include  consideration of: yields or prices of securities of comparable quality,
coupon,  maturity  and  type; indications as to values from dealers; and general
market  conditions.  Short-term  investments, excluding U.S. Treasury Bills, are
carried at amortized cost, which approximates value.

(b)  Securities  transactions and investment income: Securities transactions are
recorded  on  a  trade date basis. Interest income, including, where applicable,
amortization  of  discount  on  investments, is recognized on the accrual basis.
Realized  gain  and  loss  from  securities  transactions  are  recorded  on the
identified  cost  basis.  Under  the  terms  of  the custody agreement, the fund
receives net earnings credits based on available cash balances left on deposit.

The  fund  may  enter  into  repurchase  agreements with financial institutions,
deemed  to  be  creditworthy  by  the  fund's  Manager, subject to  the seller's
agreement  to repurchase and the fund's agreement to resell such securities at a
mutually   agreed   upon  price.  Securities  purchased  subject  to  repurchase
agreements are deposited with the fund's custodian and, pursuant to the terms of
the  repurchase  agreement,  must have an aggregate market value greater than or
equal  to  the repurchase price plus accrued interest at all times. If the value
of  the underlying securities falls below the value of the repurchase price plus
accrued  interest,  the  fund  will  require  the  seller  to deposit additional
collateral by the next business day. If the request for additional collateral is
not met, or the seller defaults on its repurchase obligation, the fund maintains
the  right  to  sell the underlying securities at market value and may claim any
resulting loss against the seller.

(c) Dividends to shareholders: It is the policy of the fund to declare dividends
daily  from  investment  income-net.  Such dividends are paid monthly. Dividends
from  net realized capital gain are normally declared and paid annually, but the
fund  may  make  distributions  on  a  more  frequent  basis  to comply with the
distribution  requirements of the Internal Revenue Code of 1986, as amended (the
"Code"). To the

extent  that net realized capital gain can be offset by capital loss carryovers,
it is the policy of the fund not to distribute such gain.

(d) Federal income taxes: It is the policy of the fund to continue to qualify as
a  regulated  investment company, if such qualification is in the best interests
of  its  shareholders,  by complying with the applicable provisions of the Code,
and  to  make  distributions  of  taxable  income  sufficient to relieve it from
substantially all Federal income and excise taxes.

The  fund  has  an  unused  capital  loss  carryover of approximately $2,370,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized  subsequent to September 30, 1999. This
amount  is  calculated  based on Federal income tax regulations which may differ
from  financial  reporting  in  accordance  with  generally  accepted accounting
principles.  If  not  applied, $266,000 of the carryover expires in fiscal 2003,
$49,000 expires in fiscal 2004 and $2,055,000 expires in fiscal 2005.

NOTE 2--Bank Line of Credit:

The  fund  participates  with  other  Dreyfus-managed  funds  in  a $500 million
redemption  credit  facility  (the "Facility") to  be  utilized for temporary or
emergency  purposes,  including  the  financing  of  redemptions.  In connection
therewith, the fund has agreed to pay commitment fees on its pro rata portion of
the  Facility.  Interest  is  charged  to  the fund at rates based on prevailing
market  rates in effect at the time of borrowings. During the period ended March
31, 2000, the fund did not borrow under the Facility.

NOTE 3--Management Fee and Other Transactions With Affiliates:

(a)  Pursuant  to a management agreement with the Manager, the management fee is
computed  at  the  annual  rate  of .20 of 1% of the value of the fund's average
daily net assets and is payable monthly.

Unless  the  Manager  gives the fund's investors 90 days notice to the contrary,
the   Manager,   and   not   the  fund,  will  be  liable  for  fund

                                                             The  Fund

NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

expenses, exclusive of taxes, brokerage fees, interest on borrowings, commitment
fees  and  extraordinary expenses, other than the following expenses, which will
be  borne  by  the  fund:  the  management  fee,  and with respect to the fund's
Investor Shares, Rule 12b-1 Service Plan expenses.

The Manager compensates Dreyfus Transfer, Inc., a wholly-owned subsidiary of the
Manager,   under  a  transfer  agency  agreement  for  providing  personnel  and
facilities to perform transfer agency services for the fund.

The Manager compensates Mellon under a custody agreement for providing custodial
services for the fund.

(b) Under the Investor Shares Service Plan (the "Plan") adopted pursuant to Rule
12b-1  under  the  Act, the fund (a) reimburses the Distributor for distributing
the  fund's  Investor Shares and (b) pays the Manager, DSC, and any affiliate of
either  of them (collectively, "Dreyfus") for advertising and marketing relating
to  the  fund's  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  shareholder  accounts  ("Servicing"), at an
aggregate  annual rate of .25 of 1% of the value of the average daily net assets
of Investor Shares. Both the Distributor and Dreyfus may pay one or more Service
Agents   (a   securities   dealer,   financial  institution  or  other  industry
professional)  a  fee  in  respect  of  the  fund's  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. Both the Distributor
and  Dreyfus  determine  the amounts, if any, to be paid to Service Agents under
the  Plan  and the basis on which such payments are made. The fees payable under
the  Plan  are  payable  without  regard to actual expenses incurred. During the
period  ended  March  31, 2000, the fund was charged $15,122 for Investor Shares
pursuant to the Plan, of which $826 was charged by DSC.


(c)  Each trustee receives an annual fee of $1,000 and an attendance fee of $250
per  meeting.  The  Chairman  of  the  Board  receives an additional 25% of such
compensation.

NOTE 4--Securities Transactions:

The  aggregate amount of purchases and sales of investment securities, excluding
short-term  securities,  during  the  period  ended  March 31, 2000, amounted to
$186,944,526 and $182,362,144, respectively.

At  March  31,  2000, accumulated net unrealized depreciation on investments was
$258,758, consisting of $17,968 gross unrealized appreciation and $276,726 gross
unrealized depreciation.

At  March  31, 2000, the cost of investments for Federal income tax purposes was
substantially  the  same  as  the cost for financial reporting purposes (see the
Statement of Investments).

                                                             The Fund

                                                           For More Information

                        Dreyfus
                        Institutional Short Term
                        Treasury Fund
                        200 Park Avenue
                        New York, NY 10166

                        Manager

                        The Dreyfus Corporation
                        200 Park Avenue
                        New York, NY 10166

                        Custodian

                        Mellon Bank, N.A.
                        One Mellon Bank Center
                        Pittsburgh, PA 15258

                        Transfer Agent &
                        Dividend Disbursing Agent

                        Dreyfus Transfer, Inc.
                        P.O. Box 9671
                        Providence, RI 02940

                        Distributor

                        Dreyfus Service Corporation
                        200 Park Avenue
                        New York, NY 10166

To obtain information:

BY TELEPHONE
Call 1-800-645-6561

BY MAIL  Write to:
The Dreyfus Family of Funds
144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

BY E-MAIL  Send your request to [email protected]

ON THE INTERNET  Information can be viewed online or downloaded from:

http://www.dreyfus.com

(c) 2000 Dreyfus Service Corporation                                   721SA003





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