DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
N-30D, 2000-12-08
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Dreyfus
Institutional Short
Term Treasury Fund

ANNUAL REPORT
September 30, 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   Fund Performance

                             8   Statement of Investments

                             9   Statement of Assets and Liabilities

                            10   Statement of Operations

                            11   Statement of Changes in Net Assets

                            13   Financial Highlights

                            15   Notes to Financial Statements

                            20   Report of Independent Auditors

                            21   Important Tax Information

                                 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 annual report for Dreyfus Institutional Short
Term  Treasury  Fund,  covering the 12-month period from October 1, 1999 through
September  30, 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 member of the Dreyfus Taxable Fixed Income Team
that manages the fund.

Bond prices have been mixed over the past 12 months with prices of U.S. Treasury
securities  generally  ending the period higher while investment-grade corporate
bond  prices  ended  the  period at modestly lower levels than where they began.
More  recently,  most  sectors  of  the  U.S.  bond market have been affected by
slowing  economic  growth.  Additionally,  the moderating effects of the Federal
Reserve  Board's  (the "Fed") interest-rate hikes during the first half of 2000
helped  the  Fed  to achieve its goal of slowing the U.S. economy. Other factors
such  as  higher  energy  prices  and  a  weak euro also served to slow economic
growth.

In general, the overall investment environment that prevailed in the second half
of  the  1990s  had  provided  returns  well  above  their  long-term  averages,
establishing unrealistic expectations for some investors. We believe that as the
risks  of the stock market have become more apparent, the relative stability and
income  potential  of  municipal bonds can make them an attractive investment as
part of a well-balanced portfolio.

For  more  information about the economy and financial markets, we encourage you
to visit the Market Commentary section of our website at www.dreyfus.com. Or, to
speak with a Dreyfus customer service representative, call us at 1-800-782-6620

Thank you for investing in Dreyfus Institutional Short Term Treasury Fund.

Sincerely,


/s/Stephen E. Canter
Stephen E. Canter

President and Chief Investment Officer

The Dreyfus Corporation

October 16, 2000




DISCUSSION OF FUND PERFORMANCE

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

How did Dreyfus Institutional Short Term Treasury Fund perform during the
period?

For  the  12-month  period  ended  September  30, 2000, the fund's Institutional
shares  produced  a  total  return  of 5.68% and income dividends of $0.1078 per
share.  The  fund's Investor shares produced a total return of 5.42% and income
dividends  of $0.1036 per share.(1) This compares with the total return of 5.79%
provided  by the fund's benchmark, the Merrill Lynch Governments, U.S. Treasury,
Short-Term    (1-3    Years)    Index,    for    the    same    period.(2)

We   attribute   the  fund's  competitive  absolute  performance  to  favorable
supply-and-demand  factors  within  the  U.S.  Treasury  securities marketplace.
Because  of  the  federal  budget  surplus,  the  government  is  issuing  fewer
short-term securities, resulting in a reduction in available supply. At the same
time,  demand  has remained robust from domestic and foreign investors seeking a
safe   haven   amid   volatility   in   the   longer  term  financial  markets.

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.

What other factors influenced the fund's performance?

When  the  reporting period began on October 1, 1999, the U.S. economy continued
to    grow    strongly,   raising   concerns   that   long-dormant

                                                                      The   Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

inflationary  pressures  might  reemerge. In response, the Federal Reserve Board
(the  "Fed") raised short-term interest rates once in late 1999 and three times
during  the  first  half  of 2000 for a total increase of 1.25 percentage points
during  the  reporting  period. Soon thereafter, however, signs emerged that the
Fed's previous rate hikes were having the desired effect of slowing the economy,
suggesting that the Fed's restrictive monetary policies could be near an end.

Throughout most of the reporting period, short-term U.S. Treasury bills provided
higher  yields  than  long-term  U.S. Treasury bonds, a reversal of more typical
yield relationships commonly known as an inverted yield curve. This was a result
of a supply-and-demand imbalance that was unique to the U.S. Treasury securities
market.  Investors  were  faced  with  a  decline in the volume of new issuance,
resulting in a smaller available supply of U.S. Treasury securities. At the same
time,  demand  for  U.S.  Treasury  securities rose as the world's stock markets
became   more   volatile   and   investors   sought   the   relative  safety  of
government-backed  bonds. This unusual environment benefited the fund's holdings
of short-term U.S. Treasury securities.

Changes to the portfolio during the reporting period included an increase in our
holdings of inflation-indexed U.S. Treasury securities, which are more likely to
potentially  increase in price when inflationary pressures threaten, as they did
during  much  of  the  reporting  period.  This strategy helped boost the fund's
returns  incrementally.  In addition, we generally maintained the fund's average
effective  duration -- a measure of sensitivity to changing interest rates -- at
less  than  two  years.  This enabled us to capture higher yields for as long as
practical  while  leaving us enough flexibility to take advantage of even higher
yields as they became available.


What is the fund's current strategy?

Because  the  economy  has  slowed recently, suggesting that the Fed is probably
finished  with  the  current  cycle  of  interest-rate hikes, the differences in
yields  between long-term U.S. Treasury bonds and short-term U.S. Treasury bills
have  moderated. Nonetheless, as of September 30, 2000, U.S. Treasury bills with
maturities  of  less  than  two  years  continued  to provide higher yields than
30-year    U.S.    Treasury    bonds.

If  the economy continues to slow, we expect these yield differences to moderate
further.  We  also  expect  to  reduce  our  holdings  of inflation-indexed U.S.
Treasury securities if the economic slowdown continues or intensifies.

October 16, 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:  LIPPER INC. --  REFLECTS  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 ONE TO THREE YEARS;
     ISSUES IN THE INDEX MUST HAVE PAR AMOUNTS OUTSTANDING GREATER THAN OR EQUAL
     TO $1 BILLION.

                                                             The Fund

FUND PERFORMANCE

Comparison of change in value of $10,000,000 investment in Dreyfus Institutional
Short Term Treasury Fund Institutional Shares and Investor Shares and the
Merrill Lynch Governments, U.S. Treasury, Short-Term (1-3 Years) Index

((+))  SOURCE: LIPPER INC.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

THE ABOVE GRAPH COMPARES A $10,000,000 INVESTMENT MADE IN EACH OF THE
INSTITUTIONAL SHARES AND INVESTOR SHARES OF DREYFUS INSTITUTIONAL SHORT TERM
TREASURY FUND ON 10/29/93 (INCEPTION DATE) TO A $10,000,000 INVESTMENT MADE IN
THE MERRILL LYNCH GOVERNMENTS, U.S. TREASURY, SHORT-TERM (1-3 YEARS) INDEX ON
THAT DATE. FOR COMPARATIVE PURPOSES, THE VALUE OF THE INDEX ON 10/31/93 IS USED
AS THE BEGINNING VALUE ON 10/29/93. ALL DIVIDENDS AND CAPITAL GAIN DISTRIBUTIONS
ARE REINVESTED.

THE FUND INVESTS EXCLUSIVELY IN U.S. TREASURY SECURITIES AND REPURCHASE
AGREEMENTS IN RESPECT THEREOF. THE FUND'S PORTFOLIO OF U.S. TREASURY SECURITIES
WILL, UNDER NORMAL CIRCUMSTANCES, GENERALLY HAVE A DOLLAR-WEIGHTED AVERAGE
MATURITY NOT TO EXCEED TWO YEARS. THE FUND'S PERFORMANCE SHOWN IN THE LINE GRAPH
TAKES INTO ACCOUNT FEES AND EXPENSES. UNLIKE THE FUND, 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 INDEX DOES NOT TAKE INTO ACCOUNT CHARGES, FEES AND OTHER
EXPENSES. FURTHER INFORMATION RELATING TO FUND PERFORMANCE, INCLUDING EXPENSE
REIMBURSEMENTS, IF APPLICABLE, IS CONTAINED IN THE FINANCIAL HIGHLIGHTS SECTION
OF THE PROSPECTUS AND ELSEWHERE IN THIS REPORT.

<TABLE>
<CAPTION>


Average Annual Total Returns AS OF 9/30/00

                                                           Inception                                                       From

                                                             Date               1 Year              5 Years              Inception
------------------------------------------------------------------------------------------------------------------------------------

<S>                                                         <C>   <C>            <C>                  <C>                   <C>
INSTITUTIONAL SHARES                                        10/29/93             5.68%                5.67%                 5.72%

INVESTOR SHARES                                             10/29/93             5.42%                5.41%                 5.54%

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

                                                             The Fund



STATEMENT OF INVESTMENTS

September 30, 2000

                                                                                               Principal

BONDS AND NOTES--89.8%                                                                        Amount ($)               Value ($)
------------------------------------------------------------------------------------------------------------------------------------

U.S. TREASURY INFLATION PROTECTION SECURITIES--6.6%

   3.625%, 7/15/2002                                                                          1,251,000  (a)           1,346,766

U.S. TREASURY NOTES--61.2%

   5.375%, 6/30/2003                                                                          1,000,000                  985,930

   5.75%, 11/30/2002                                                                          2,000,000                1,990,620

   6.25%, 7/31/2002                                                                           2,000,000                2,007,500

   6.25%, 8/31/2002                                                                           2,600,000                2,604,862

   6.375%, 4/30/2002                                                                          4,000,000                4,017,480

   6.5%, 5/31/2002                                                                            1,000,000                1,006,870

                                                                                                                      12,613,262

U.S. TREASURY PRINCIPAL STRIPS--22.0%

   Zero Coupon, 5/15/2002                                                                     5,000,000                4,537,750

TOTAL BONDS AND NOTES

   (cost $18,447,833)                                                                                                 18,497,778
------------------------------------------------------------------------------------------------------------------------------------

SHORT-TERM INVESTMENTS--9.8%
------------------------------------------------------------------------------------------------------------------------------------

REPURCHASE AGREEMENTS;

Greenwich Capital Acceptance, 6.48%

  dated 9/29/2000, due 10/2/2000 in the amount of $2,016,088

  (fully collateralized by $2,172,000 U.S. Treasury Bills,

  8/30/2001, value $2,056,884)

   (cost $2,015,000)                                                                          2,015,000                2,015,000
------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $20,462,833)                                                              99.6%               20,512,778

CASH AND RECEIVABLES (NET)                                                                          .4%                   90,260

NET ASSETS                                                                                       100.0%               20,603,038

(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

September 30, 2000

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

ASSETS ($):

Investments in securities--See Statement of
   Investments--Note 1(b)                               20,462,833   20,512,778

Interest receivable                                                     222,011

                                                                     20,734,789
--------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                             4,311

Cash overdraft due to Custodian                                          51,225

Payable for shares of Beneficial Interest redeemed                       76,215

                                                                        131,751
--------------------------------------------------------------------------------

NET ASSETS ($)                                                       20,603,038
--------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                      24,401,130

Accumulated undistributed investment income-net                           3,210

Accumulated net realized gain (loss) on investments                  (3,851,247)

Accumulated net unrealized appreciation (depreciation)
  on investments--Note 4                                                 49,945
--------------------------------------------------------------------------------

NET ASSETS ($)                                                       20,603,038

NET ASSET VALUE PER SHARE

                                                Institutional          Investor

                                                       Shares            Shares
--------------------------------------------------------------------------------

Net Assets ($)                                     15,881,354         4,721,684

Shares Outstanding                                  8,097,538         2,392,444
--------------------------------------------------------------------------------

NET ASSET VALUE PER SHARE ($)                            1.96             1.97

SEE NOTES TO FINANCIAL STATEMENTS.


                                                             The Fund



STATEMENT OF OPERATIONS

Year Ended September 30, 2000

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

INVESTMENT INCOME ($):

INTEREST INCOME                                                      2,089,613

EXPENSES:

Management fee--Note 3(a)                                               72,636

Distribution fees (Investor Shares)--Note 3(b)                          22,699

Loan commitment fees--Note 2                                               393

TOTAL EXPENSES                                                          95,728

INVESTMENT INCOME--NET                                               1,993,885
--------------------------------------------------------------------------------

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

Net realized gain (loss) on investments                               (434,806)

Net unrealized appreciation (depreciation) on investments              182,985

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS                (251,821)

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                 1,742,064

SEE NOTES TO FINANCIAL STATEMENTS.



STATEMENT OF CHANGES IN NET ASSETS

                                                    Year Ended September 30,
                                               ---------------------------------

                                                     2000                1999
--------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                          1,993,885            3,461,211

Net realized gain (loss) on investments          (434,806)            (605,246)

Net unrealized appreciation (depreciation)
   on investments                                 182,985           (1,016,374)

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                    1,742,064            1,839,591
--------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

Investment income--net:

Institutional Shares                          (1,510,160)          (2,848,674)

Investor Shares                                 (480,515)            (612,537)

TOTAL DIVIDENDS                               (1,990,675)          (3,461,211)
--------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($):

Net proceeds from shares sold:

Institutional Shares                            6,386,776          11,174,934

Investor Shares                                 2,817,680          10,873,127

Dividends reinvested:

Institutional Shares                              880,460           1,537,269

Investor Shares                                   415,810             474,861

Cost of shares redeemed:

Institutional Shares                          (23,101,762)        (44,681,614)

Investor Shares                               (13,050,319)         (6,713,129)

INCREASE (DECREASE) IN NET ASSETS FROM
   BENEFICIAL INTEREST TRANSACTIONS           (25,651,355)        (27,334,552)

TOTAL INCREASE (DECREASE) IN NET ASSETS       (25,899,966)        (28,956,172)
--------------------------------------------------------------------------------

NET ASSETS ($):

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

END OF PERIOD                                  20,603,038           46,503,004

Undistributed investment income--net                3,210                  --

                                                             The Fund


STATEMENT OF CHANGES IN NET ASSETS (CONTINUED)

                                                    Year Ended September 30,
                                               ---------------------------------

                                                     2000                 1999
--------------------------------------------------------------------------------

CAPITAL SHARE TRANSACTIONS:

INSTITUTIONAL SHARES

Shares sold                                     3,278,387            5,642,770

Shares issued for dividends reinvested            452,514              775,200

Shares redeemed                               (11,858,649)         (22,600,748)

NET INCREASE (DECREASE) IN SHARES OUTSTANDING  (8,127,748)         (16,182,778)

INVESTOR SHARES

Shares sold                                     1,438,812            5,446,533

Shares issued for dividends reinvested            212,481              238,378

Shares redeemed                                (6,673,571)          (3,357,193)

NET INCREASE (DECREASE) IN SHARES OUTSTANDING  (5,022,278)           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.

                                                                                             Year Ended September 30,
                                                                 -------------------------------------------------------------------

INSTITUTIONAL SHARES                                             2000           1999           1998        1997(a)          1996
------------------------------------------------------------------------------------------------------------------------------------

PER SHARE DATA ($):

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

Investment Operations:

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

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

Total from Investment Operations                                  .11            .06            .15            .12           .12

Distributions:

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

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

TOTAL RETURN (%)                                                 5.68           2.92           7.56           6.23          6.03
------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to average net assets                           .20            .20            .20            .20           .20

Ratio of net investment income
   to average net assets                                         5.55           5.39           5.81           6.04          6.40

Portfolio Turnover Rate                                        871.42         823.06         756.50         952.81        694.24
------------------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period ($x1,000)                            15,881         31,860         65,163        118,102       170,290

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

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund



FINANCIAL HIGHLIGHTS (CONTINUED)

                                                                                          Year Ended September 30,
                                                                 -------------------------------------------------------------------

INVESTOR SHARES                                                  2000           1999           1998        1997(a)          1996
------------------------------------------------------------------------------------------------------------------------------------

PER SHARE DATA ($):

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

Investment Operations:

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

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

Total from Investment Operations                                  .10            .05            .14            .12           .11

Distributions:

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

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

TOTAL RETURN (%)                                                 5.42           2.68           7.30           5.97          5.76
------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to average net assets                           .45            .45            .45            .45           .45

Ratio of net investment income
   to average net assets                                         5.30           5.16           5.57           5.83          6.13

Portfolio Turnover Rate                                        871.42         823.06         756.50         952.81        694.24
------------------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period ($x1,000)                             4,722         14,643         10,296         35,296        24,490

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

SEE NOTES TO FINANCIAL STATEMENTS.

</TABLE>


NOTES TO FINANCIAL STATEMENTS

NOTE 1--Significant Accounting Policies:

Dreyfus  Institutional Short Term Treasury Fund (the "fund") is registered under
the  Investment  Company  Act  of 1940, 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 (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 $3,593,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized  subsequent to September 30, 2000. 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, $2,055,000 expires in fiscal 2005 and $1,223,000
expires in fiscal 2008.

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
September 30, 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 (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 pays the distributor for distributing the fund's
Investor  Shares,  for  servicing  shareholder  accounts  ("Servicing") and for
advertising  and  marketing  relating  to  the  fund's Investor Shares. The Plan
provides  for payments to be made at an annual rate of .25 of 1% of the value of
the  average  daily  net  assets  of  Investor  Shares. Prior to March 22, 2000,
Premier Mutual Fund Services, Inc. and not DSC, received payments under the Plan
for  distributing  the  fund's  Investor Shares. The distributor determines the
amounts,  if  any,  to be paid to Service Agents (a securities dealer, financial
institutional  or  other  industry professional) 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 September
30, 2000, the fund was charged $22,699 for Investor Shares pursuant to the Plan,
of which $8,403 was paid to DSC.


(c)  Each  Board  member also serves as a Board member of other funds within the
Dreyfus complex (collectively, the "Fund Group"). Effective August 3, 2000, each
Board member who is not an "affiliated person" as defined in the Act receives an
annual fee of $45,000 and an attendance fee of $5,000 for each in person meeting
and $500 for telephone meetings. These fees are allocated among the funds in the
Fund  Group.  The  chairman  of  the  Board  receives  an additional 25% of such
compensation.  Prior  to  August  3,  2000,  each  Board  member  who was not an
"affiliated  person" as defined in the Act received from the fund an annual fee
of  $1,000  and an attendance fee of $250 per meeting. The Chairman of the Board
received  an additional 25% of such compensation. Subject to the fund's Emeritus
Program  Guidelines,  Emeritus  Board Members, if any, receive 50% of the fund's
annual  retainer  fee  and  per  meeting  fee  paid at the time the Board member
achieves emeritus status.

NOTE 4--Securities Transactions:

The  aggregate amount of purchases and sales of investment securities, excluding
short-term  securities,  during the period ended September 30, 2000, amounted to
$296,680,894 and $316,947,185, respectively.

At  September  30,  2000, accumulated net unrealized appreciation on investments
was  $49,945,  consisting  of  $87,697 gross unrealized appreciation and $37,752
gross unrealized depreciation.

At  September  30, 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

REPORT OF INDEPENDENT AUDITORS

Shareholders and Board of Trustees Dreyfus Institutional Short Term Treasury
Fund

We  have audited the accompanying statement of assets and liabilities of Dreyfus
Institutional  Short Term Treasury Fund, including the statement of investments,
as  of  September 30, 2000, and the related statement of operations for the year
then  ended, the statement of changes in net assets for each of the two years in
the  period then ended, and financial highlights for each of the years indicated
therein.   These   financial   statements   and  financial  highlights  are  the
responsibility  of  the  Fund's management. Our responsibility is to express an
opinion  on  these  financial  statements  and financial highlights based on our
audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to  obtain  reasonable  assurance  about  whether  the  financial statements and
financial  highlights  are  free  of  material  misstatement.  An audit includes
examining,  on  a test basis, evidence supporting the amounts and disclosures in
the  financial  statements  and  financial  highlights.  Our procedures included
verification  by examination of securities held by the custodian as of September
30,   2000  and  confirmation  of  securities  not  held  by  the  custodian  by
correspondence  with  others.  An  audit  also includes assessing the accounting
principles  used  and  significant  estimates  made  by  management,  as well as
evaluating  the  overall  financial  statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

In  our  opinion,  the financial statements and financial highlights referred to
above  present  fairly,  in  all  material  respects,  the financial position of
Dreyfus  Institutional  Short  Term  Treasury  Fund  at  September 30, 2000, the
results of its operations for the year then ended, the changes in its net assets
for each of the two years in the period then ended, and the financial highlights
for  each  of  the  indicated  years,  in  conformity with accounting principles
generally accepted in the United States.


Ernst & Young LLP
New York, New York

November 1, 2000



IMPORTANT TAX INFORMATION (Unaudited)

For  State  individual income tax purposes, the fund hereby designates 93.43% of
the  ordinary  income  dividends paid during its fiscal year ended September 30,
2000  as  attributable  to interest income from direct obligations of the United
States.  Such dividends are currently exempt from taxation for individual income
tax  purposes in most states, including New York, California and the District of
Columbia.

                                                             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                                   721AR009




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