DREYFUS ONE HUNDRED PERCENT US TREASURY MONEY MARKET FUND
N-30D, 2000-08-25
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Dreyfus
100% U.S. Treasury
Money Market Fund

SEMIANNUAL REPORT June 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   Statement of Investments

                             7   Statement of Assets and Liabilities

                             8   Statement of Operations

                             9   Statement of Changes in Net Assets

                            10   Financial Highlights

                            11   Notes to Financial Statements

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

                                 Back Cover

                                                                       The Fund

                                                     Dreyfus 100% U.S. Treasury
                                                              Money Market Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We  are pleased to present this semiannual report for Dreyfus 100% U.S. Treasury
Money  Market  Fund,  covering the six-month period from January 1, 2000 through
June  30,  2000. Inside, you'll find valuable information about how the fund was
managed  during  the  reporting  period,  including a discussion with the fund's
portfolio manager, Bernard W. Kiernan, Jr.

When  the  reporting  period  began,  international  and domestic economies were
growing   rapidly,  giving  rise  to  concerns  that  long-dormant  inflationary
pressures  might  reemerge.  Consumers  continued to spend heavily, unemployment
levels  reached  new lows and the stock market, while highly volatile, generally
continued to climb.

Because  robust  economic  growth  may trigger an acceleration of inflation, the
Federal  Reserve  Board  raised key short-term interest rates three times during
the  reporting  period,  for  a  total increase of 1.00 percentage points. These
interest-rate  hikes  contributed  to  a  total  interest-rate  increase of 1.75
percentage  points  since  late  June  1999, before the current reporting period
began.  While these economic influences generally adversely affected longer term
bonds, they positively influenced money market yields.

We  appreciate  your confidence over the past six months, and we look forward to
your  continued  participation  in Dreyfus 100% U.S. Treasury Money Market Fund.

Sincerely,


Stephen E. Canter
President and Chief Investment Officer
The Dreyfus Corporation
July 17, 2000




DISCUSSION OF FUND PERFORMANCE

Bernard W. Kiernan, Jr., Portfolio Manager

How did Dreyfus 100% U.S. Treasury Money Market Fund perform during the period?

For  the  six-month  period ended June 30, 2000, the fund produced an annualized
yield  of 4.89% which, taking into account the effect of compounding, created an
annualized effective yield of 5.00%.(1)

What is the fund's investment approach?

The  fund  seeks to maintain a stable share price of $1.00. To pursue this goal,
the fund invests only in U.S. Treasury securities.

What factors influenced the fund's performance?

The  money  market  continued  to  digest  mixed signals from the economy as the
reporting  period  began. The Open Market Committee of the Federal Reserve Board
(the  "Fed") had  acted  to  relieve inflationary pressures and raised interest
rates  three  times in 2000 for a total increase of 1.00 percentage points. Each
tightening  brought renewed debate as to whether rates were sufficiently high to
ease  growth  and  head  off  inflation,  or whether further tightening would be
necessary.

The  economic data for late 1999 illustrated that Gross Domestic Product ("GDP")
growth   had   quickened  to  7.3%  for  the  fourth  quarter,  influencing  the
interest-rate hikes made by the Fed during the reporting period. Concern mounted
that  economic  growth  was accelerating considerably past a limit that could be
sustained without triggering destructive levels of inflation.

Preliminary  first  quarter  2000  figures  showed GDP growth slowing but it was
still  strong  at  5.4%. Continuing indications that prices, most notably in the
energy  sector, were moving higher added to the money market's concerns. Greater
than  expected domestic demand for goods and services continued. Events overseas
have also had an impact on
                                                                        The Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

inflation.  Following the Asian economic crisis of 1998, demand outside the U.S.
weakened,  enabling  the  U.S. economy to grow at an unusually fast pace without
setting  off  commodity  inflation. As overseas economies have recovered, demand
for  raw  materials  has  picked  up  as  well,  creating upward price pressure.

Through  much  of  the  first  half  of  2000,  consumer confidence and consumer
spending  showed few signs of abating in response to gradual and relatively mild
rate  hikes.  Home  and  auto  sales  continue at record paces through the first
quarter  and  into the second quarter of 2000. The tightest U.S. labor market in
the past 30 years added the threat of wage-driven inflation. Such price and wage
factors  led  the  Fed to its largest rate hike in its current credit tightening
cycle: a 0.50 percentage-point increase at its May 16th meeting.

More  recently,  we have seen signs that the Fed's series of rate hikes may have
begun  to slow the economy. Retail sales declined in both April and May, housing
starts  have  slowed  dramatically,  and  inflation  figures  through early 2000
appeared to be lower than market expectations. As a result, the Fed chose not to
tighten rates further at its June 28th meeting.

But  economic signals remain contradictory; it is not clear that the economy has
yet  cooled  sufficiently  for  the  Fed  to  consider its job done. Immediately
following  the  Fed's  June  meeting, economic reports indicated that, although
growth  may  be  slowing, inflation may be higher than previously thought. While
indexes  measuring  demand  for housing and labor fell back in May, the personal
consumption expenditures price index for first quarter 2000 was adjusted upward,
from  3.1%  to  3.5%. This measure, closely followed by Federal Reserve Chairman
Alan  Greenspan,  generally is considered by many to be among the best gauges of
inflation  and  could indicate that the Fed's concern over "heightened inflation
pressure" may lead to a further tightening when the Fed meets again in August.


What is the fund's current strategy?

As  of  June  30,  2000,  the  fund's average maturity remained longer than the
industry  average  for  all  treasury  money  market  funds. We will continue to
monitor  the  situation, including the economy and changes in the Fed's monetary
policy,  and  we  will  look  to take what we believe are appropriate actions in
response  with  respect to the fund's portfolio, including its average portfolio
maturity.

July 17, 2000

(1)  ANNUALIZED EFFECTIVE YIELD IS BASED UPON DIVIDENDS DECLARED DAILY AND
REINVESTED MONTHLY. PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. YIELDS
FLUCTUATE. AN INVESTMENT IN THE FUND IS NOT INSURED OR GUARANTEED BY THE FDIC OR
THE U.S. GOVERNMENT. ALTHOUGH THE FUND SEEKS TO PRESERVE THE VALUE OF YOUR
INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE
FUND.

                                                             The Fund

June 30, 2000 (Unaudited)

<TABLE>

STATEMENT OF INVESTMENTS


                                            Annualized
                                            Yield on
                                            Date of                 Principal
U.S. TREASURY BILLS--29.1%                  Purchase (%)            Amount ($)            Value ($)
------------------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>                    <C>                  <C>

7/6/2000                                      5.69                   3,481,000            3,478,274

7/13/2000                                     5.72                  16,390,000           16,359,175

7/20/2000                                     5.70                   7,160,000            7,138,780

8/3/2000                                      5.80                   2,647,000            2,633,121

8/10/2000                                     6.05                   2,491,000            2,474,504

8/17/2000                                     5.79                   6,243,000            6,196,451

8/24/2000                                     5.78                 151,843,000          150,545,101

8/31/2000                                     5.64                   3,020,000            2,991,548

9/7/2000                                      5.83                   2,410,000            2,383,847

9/21/2000                                     5.76                   8,185,000            8,079,114

10/12/2000                                    5.82                   1,791,000            1,761,689

11/30/2000                                    6.20                  76,000,000           74,071,964

1/4/2001                                      6.07                  19,795,000           19,206,039

TOTAL U.S. TREASURY BILLS

   (cost $297,319,607)                                                                  297,319,607
------------------------------------------------------------------------------------------------------------------------------------

U.S. TREASURY NOTES--69.5%
------------------------------------------------------------------------------------------------------------------------------------

6.125%, 7/31/2000                             5.84                  31,270,000           31,273,222

6.00%, 8/15/2000                              5.74                   5,180,000            5,180,188

8.75%, 8/15/2000                              5.88                 260,000,000          260,846,285

6.25%, 8/31/2000                              5.91                 200,000,000          200,037,922

4.00%, 10/31/2000                             6.30                  15,000,000           14,881,301

5.75%, 11/15/2000                             6.17                 130,000,000          129,718,758

4.625%, 11/30/2000                            6.30                  70,000,000           69,497,596

TOTAL U.S. TREASURY NOTES

   (cost $711,435,272)                                                                  711,435,272
------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $1,008,754,879)       98.6%                                   1,008,754,879

CASH AND RECEIVABLES (NET)                     1.4%                                      14,242,586

NET ASSETS                                   100.0%                                   1,022,997,465

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



STATEMENT OF ASSETS AND LIABILITIES

June 30, 2000 (Unaudited)

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

ASSETS ($):

Investments in securities--See Statement of
Investments                                        1,008,754,879  1,008,754,879

Interest receivable                                                  14,985,134

Prepaid expenses and other assets                                        43,254

                                                                  1,023,783,267
--------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                           454,359

Cash overdraft due to Custodian                                         219,918

Accrued expenses                                                        111,525

                                                                        785,802
--------------------------------------------------------------------------------

NET ASSETS ($)                                                    1,022,997,465
--------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                   1,023,010,037

Accumulated net realized gain (loss) on investments                     (12,572)
--------------------------------------------------------------------------------

NET ASSETS ($)                                                    1,022,997,465
--------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares of Beneficial
Interest authorized)                                              1,022,721,263

NET ASSET VALUE, offering and redemption price per share ($)              1.00

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

STATEMENT OF OPERATIONS

Six Months Ended June 30, 2000 (Unaudited)

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

INVESTMENT INCOME ($):

INTEREST INCOME                                                      29,935,742

EXPENSES:

Management fee--Note 2(a)                                             2,672,184

Shareholder servicing costs--Note 2(b)                                  922,735

Custodian fees                                                           40,857

Trustees' fees and expenses--Note 2(c)                                   36,489

Registration fees                                                        26,829

Prospectus and shareholders' reports                                     25,437

Professional fees                                                        18,567

Miscellaneous                                                             5,265

TOTAL EXPENSES                                                        3,748,363

INVESTMENT INCOME--NET                                               26,187,379
--------------------------------------------------------------------------------

NET REALIZED GAIN (LOSS) ON INVESTMENTS-NOTE 1(B) ($):                  394,596

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                 26,581,975

SEE NOTES TO FINANCIAL STATEMENTS.



STATEMENT OF CHANGES IN NET ASSETS

                                         Six Months Ended
                                            June 30, 2000  Year Ended
                                              (Unaudited)  December 31, 1999
--------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                         26,187,379       44,845,198

Net realized gain (loss) from investments         394,596          (61,191)

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                   26,581,975       44,784,007
-------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                        (26,187,379)     (44,845,198)
--------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($1.00 per share):

Net proceeds from shares sold                 547,612,142    1,066,213,178

Dividends reinvested                           24,900,613       42,769,116

Cost of shares redeemed                      (656,038,010)  (1,145,375,828)

INCREASE (DECREASE) IN NET ASSETS FROM
   BENEFICIAL INTEREST TRANSACTIONS           (83,525,255)     (36,393,534)

TOTAL INCREASE (DECREASE) IN NET ASSETS       (83,130,659)     (36,454,725)
--------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of Period                         1,106,128,124    1,142,582,849

END OF PERIOD                               1,022,997,465    1,106,128,124

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

FINANCIAL HIGHLIGHTS

The  following table describes the performance for the fiscal periods indicated.
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.

<TABLE>

                                        Six Months Ended
                                          June 30, 2000
                                           (Unaudited)                            Year Ended December 31,
                                        --------------------------------------------------------------------------------------
                                                1999           1998            1997            1996            1995
------------------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>          <C>             <C>            <C>               <C>            <C>

PER SHARE DATA ($):

Net asset value,
   beginning of period                         1.00         1.00           1.00           1.00              1.00           1.00

Investment Operations:

Investment income--net                         .024          .041           .045           .046              .046           .051

Distributions:

Dividends from
   investment
   income--net                               (.024)          (.041)           (.045)         (.046)          (.046)         (.051)

Net asset value,
   end of period                             1.00            1.00             1.00           1.00            1.00           1.00
------------------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                             4.93(a)         4.17             4.55           4.74            4.67           5.19
------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                         .70(a)          .71              .75            .71             .73            .69

Ratio of net investment
   income to average
   net assets                                 4.89(a)        4.10             4.46           4.64             4.55          5.09
------------------------------------------------------------------------------------------------------------------------------------

Net Assets,end of period
   ($ x 1,000)                           1,022,997      1,106,128        1,142,583      1,203,948        1,286,854      1,310,691

(A) ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--Significant Accounting Policies:

Dreyfus  100%  U.S.  Treasury Money Market 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 as high a level of current income as is consistent with
the  preservation  of  capital  and the maintenance of liquidity by investing in
obligations  of the U.S. Treasury that provide interest income exempt from state
and  local  income  taxes. The Dreyfus Corporation (the "Manager") serves as the
fund' s  investment  adviser. The Manager is a direct subsidiary of Mellon Bank,
N.A,  which  is  a  wholly-owned  subsidiary  of  Mellon  Financial Corporation.
Effective  March  22,  2000, Dreyfus Service Corporation ("DSC"), a wholly-owned
subsidiary  of  the  Manager, became the distributor of the fund's shares, which
are  sold to the public without a sales charge. Prior to March 22, 2000, Premier
Mutual Fund Services, Inc. was the distributor.

It  is  the  fund's policy to maintain a continuous net asset value per share of
$1.00; the fund has adopted certain investment, portfolio valuation and dividend
and distribution policies to enable it to do so. There is no assurance, however,
that  the  fund  will  be able to maintain a stable net asset value per share of
$1.00.

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 are valued at amortized cost,
which  has been determined by the fund's Board of Trustees to represent the fair
value of the fund's investments.

(B)  SECURITIES  TRANSACTIONS AND INVESTMENT INCOME: Securities transactions are
recorded  on  a  trade  date  basis.  Realized  gain  and  loss  from securities
transactions  are  recorded  on  the  identified  cost basis. Interest income is
recognized on the accrual basis.  Cost of investments repre-
                                                                        The Fund

NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

sents  amortized  cost.  Under  the  terms  of  the  custody agreement, the fund
receives net earnings credits based on available cash balances left on deposit.

(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  the 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 $403,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized  subsequent  to December 31, 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,  $13,000 of the carryover expires in fiscal 2003,
$153,000 expires in fiscal 2004, $23,000 expires in fiscal 2005, $75,000 expires
in fiscal 2006 and $139,000 expires in fiscal 2007.

At  June  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).

NOTE 2--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 .50 of 1% of the value of the fund's average
daily net assets and is payable monthly.


(B)  Under  the Shareholder Services Plan, the fund reimburses DSC an amount not
to  exceed  an annual rate of .25 of 1% of the value of the fund's average daily
net  assets for certain allocated expenses of providing personal services and/or
maintaining  shareholder  accounts.  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. During the period
ended  June  30, 2000, the fund was charged $649,631 pursuant to the Shareholder
Services Plan.

The  fund  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. During the period
ended  June  30,  2000,  the  fund was charged $159,109 pursuant to the transfer
agency agreement.

(C)  Each  Board  member also serves as a Board member of other funds within the
Dreyfus complex (collectively, the "Fund Group"). Effective April 11, 2000, each
Board member who is not an "affiliated person" as defined in the Act receives an
annual fee of $30,000 and an attendance fee of $4,000 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  April  11,  2000,  each  Board  member  who was not an
" affiliated  person" as defined in the Act received from the fund an annual fee
of  $4,500  and an attendance fee of $500 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.

                                                             The Fund

                                  For More Information

                        Dreyfus 100% U.S. Treasury Money Market Fund
                        200 Park Avenue
                        New York, NY 10166

                        Manager

                        The Dreyfus Corporation
                        200 Park Avenue
                        New York, NY 10166

                        Custodian

                        The Bank of New York
                        100 Church Street
                        New York, NY 10286

                        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                                   071SA006





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