DREYFUS ONE HUNDRED PERCENT US TREASURY MONEY MARKET FUND
N-30D, 1999-03-01
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YEAR 2000 ISSUES (UNAUDITED)

  The  fund  could  be  adversely  affected  if the computer systems used by The
Dreyfus  Corporation  and  the  fund' s  other service providers do not properly
process  and  calculate date-related information from and after January 1, 2000.
The  Dreyfus  Corporation  is working to avoid Year 2000-related problems in its
systems  and  to  obtain  assurances  from other service providers that they are
taking  similar  steps.  In  addition,  issuers  of securities in which the fund
invests may be adversely affected by Year 2000-related problems. This could have
an impact on the value of the fund's investments and its share price.

DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

LETTER TO SHAREHOLDERS

Dear Shareholder:

  We  are  pleased  to report the performance for the Dreyfus 100% U.S. Treasury
Money  Market  Fund  for  the 12-month period ended December 31, 1998. Your Fund
produced  a  yield  of  4.46%  and,  after  taking  into  account  the effect of
compounding, the effective yield was 4.55%.*

ECONOMIC REVIEW

  During  1998,  the  main  regions  of  the  world  had very different economic
fundamentals.  The  U.S.  entered  the  year  with  a  strong  economy near full
employment, with unemployment only slightly above 4%. The tight labor market led
the  Federal  Reserve Board to contemplate a rise in interest rates early in the
year,  but  world  economic  weakness  generated powerful enough disinflationary
forces  that  the Fed acted instead to ease credit beginning in September. After
many  years of subpar economic growth, continental Europe moved into a sustained
economic  expansion. The overall European economy benefited as interest rates in
peripheral  countries such as Spain and Italy fell, approaching the lower levels
established  by  Germany,  on  the eve of currency unification. Unlike the U.S.,
Europe  has  substantial excess capacity of productive plant and labor. In Asia,
weak  economies  were  pervasive  as  a  result of a financial crisis. The Latin
American  economies weakened in turn as the financial stresses spread throughout
that  region. On balance, there was a substantial weakening of the world economy
over  the  course  of  1998  moderated mainly by the American consumer's role as
"spender of last resort."

A main influence on the U.S. economy during the year was the foreign financial
crisis  and  consequent  cooling  of the world economy. The positive effects hit
first.  Actual  inflation  and  expected inflation dropped, causing a decline in
long-term  Treasury  bond  yields  and  mortgage  rates.  This  caused a boom in
housing.  The  fall in inflation left more of the growth in consumer income with
which to buy goods and services. Thus, consumers benefited from a combination of
good  growth  in income after inflation, a strong labor market, and increases in
the  prices  of assets they owned, including bonds, stocks and real estate. In a
sense,  1998  was  a  year  of  disinflationary boom in the U.S., as above-trend
economic growth coincided with negligible inflation.

  The  negative  effect of Asian weakness was felt in the industrial sector more
than  in  the consumer sector. Corporate profits weakened, especially in sectors
affected  by  the Asian crisis such as world-traded commodities (oil, metals and
paper)    and    exports.

  Evidence  of  a  weaker world economy accumulated during 1998 as the financial
stresses  continued.  A  worsened  financial crisis occurred between the Russian
default  in  mid-August  and  the  fallout from the Long Term Capital Management
hedge  fund crisis through early October. However, energetic steps were taken to
stabilize the Japanese banks, design a support package for Brazil, ease monetary
policy,   and  help  overinvested  financial  institutions  rebuild  their  cash
reserves.  Indications of a calming of financial fears were evident in the final
months  of  the  year.  In  any  case, there appears to have been a shift in the
priorities   of   key   policymakers   from   fighting  potential  inflation  to
restimulating future world economic growth.

  The  global  economy  survived  a  triple financial crisis in 1998 from Japan,
emerging  market  countries  and  overextended  financial  institutions.  Excess
capacity  persists  in  many  worldwide  industries  after years of high capital
spending  followed by the onset of a worldwide weakening in demand. Fortunately,
the  U.S.  has  led  the  world  in  making  the  transition  away  from the old
manufacturing  industries  to  the new growth industries, such as biotechnology,
software,  computer hardware and the Internet. This contributed to the favorable
combination  of low unemployment and low inflation in the U.S., and may yet lead
toward more efficient allocation of capital elsewhere in the world.

  As  1998 ended, interest rates set by central banks remained in a downtrend in
most  parts  of the world including Europe and the U.S. A similar trend had even
begun in many emerging countries, as the stresses of financial crisis relaxed.

MARKET ENVIRONMENT/PORTFOLIO FOCUS

  The  economic  forces described above drove down interest rates in late summer
and  early  fall. Later in the year there was a modest increase in rates. One of
its  effects  was to change the yield curve from one that had been negative to a
positive,  sloping  structure.  In this normal configuration, longer-term yields
exceeded those of the shorter-term instruments.

  A  flight  to  safety  by  global  investors  was  the  force  that drove down
longer-term  U.S.  yields  last  fall. In recent weeks, investors appear to have
become  more  confident about the economic outlook. One factor has been the rise
in  interest rates in Japan, which brought about some repatriation of investment
funds to that country. In addition, the introduction of the Euro currency at the
start  of  the  new year, which was well received, put some downward pressure on
the U.S. dollar.

Investor fears of worldwide financial turmoil seemed to have receded recently.
Currently,  prices  and  rates in the money market appear to be reacting more to
underlying  economic  forces  than  to  such market psychology factors. This, of
course,   can   be   constructive  for  investors  in  short-term  money  market
instruments.

The fact that the Federal Reserve Open Market Committee lowered interest rates
three   times   between   late   September   and  year-end  has  been  a  strong
confidence-building  factor  in  the  markets.  Currently,  we expect the Fed to
remain in a "wait and see" mode for a while.

  During  the reporting period, we lengthened the average portfolio maturity, as
we  deemed appropriate in order to take advantage of possible declining interest
rates.  We  will  continue  to  monitor the market, including interest rates, in
seeking investment opportunities for the Fund.

               Sincerely,



               [Patricia A. Larkin signature]


               Patricia A. Larkin

               Senior Portfolio Manager

January 13, 1999

New York, N.Y.

* Effective yield is based upon dividends declared daily and reinvested monthly

<TABLE>
<CAPTION>
DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS                                    DECEMBER 31, 1998

                                              Annualized
                                              Yield on
                                              Date of  Principal

U.S. Treasury Bills--27.6%                                                    Purchase            Amount              Value
- ---------------------------------------------------------------------------- _________      _________________ _________________
<S>                                                                              <C>        <C>                 <C>
  1/14/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     3.71%      $         449,000   $       448,403

  1/21/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.54             100,106,000        99,855,540

  2/4/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.44               1,402,000         1,395,158

  2/11/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.50             129,447,000       128,789,989

  3/4/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.43               4,025,000         3,994,638

  3/25/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.35              34,632,000        34,287,813

  4/1/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.69              19,406,000        19,184,286

  5/27/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.40               8,724,000         8,542,851

  6/3/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.42               1,262,000         1,238,830

  6/24/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.33               4,395,000         4,287,321

  7/22/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.32              10,090,000         9,803,866

  12/9/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.60               3,171,000         3,038,126
                                                                                                                _______________

TOTAL U.S. TREASURY BILLS (cost $314,866,821). . . . . . . . . . . . . . . .                                    $   314,866,821
                                                                                                                _______________

U.S. Treasury Notes--70.4%
- ----------------------------------------------

  5%, 1/31/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.12%       $      1,193,000   $     1,192,733

  5.875%, 1/31/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.33             125,000,000       125,136,297

  5%, 2/15/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.47              90,000,000        90,034,667

  8.875%, 2/15/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.53              78,000,000        78,394,255

  5.875%, 2/28/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.98             210,780,000       211,053,120

  6.25%, 3/31/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.25              52,143,000        52,385,727

  6.375%, 4/30/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.17              13,645,000        13,694,620

  6.50%, 4/30/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.43              72,000,000        72,236,577

  6.25%, 5/31/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.55              76,820,000        77,319,752

  6.375%, 7/15/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     5.25              25,000,000        25,106,961

  5.875%, 7/31/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.47              50,000,000        50,339,042

  6%, 10/15/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.61               8,032,000         8,112,160

                                                                                                                _______________

TOTAL U.S. TREASURY NOTES (cost $805,005,911). . . . . . . . . . . . . . . .                                    $   805,005,911
                                                                                                                _______________

TOTAL INVESTMENTS (cost $1,119,872,732). . . . . . . . . . . . . .     98.0%                                     $1,119,872,732
                                                                     _______                                    _______________

CASH AND RECEIVABLES (NET) . . . . . . . . . . . . . . . . . . . .      2.0%                                   $     22,710,117
                                                                     _______                                    _______________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . .    100.0%                                     $1,142,582,849
                                                                     _______                                    _______________

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>
DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF ASSETS AND LIABILITIES                         DECEMBER 31, 1998

                                                                                                   Cost              Value
                                                                                              _______________   _______________
<S>                                                                                            <C>               <C>
ASSETS:                          Investments in securities--See Statement of Investments . .   $1,119,872,732    $1,119,872,732

                                 Cash  . . . . . . . . . . . . . . . . . . . . . . . . . .                            7,567,955

                                 Interest receivable . . . . . . . . . . . . . . . . . . .                           15,881,175

                                 Prepaid expenses and other assets . . . . . . . . . . . .                               93,175
                                                                                                                _______________

                                                                                                                  1,143,415,037
                                                                                                                _______________

LIABILITIES:                     Due to The Dreyfus Corporation and affiliates . . . . . .                              530,667

                                 Accrued expenses  . . . . . . . . . . . . . . . . . . . .                              301,521
                                                                                                                _______________

                                                                                                                        832,188
                                                                                                                _______________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                       $1,142,582,849
                                                                                                                _______________


REPRESENTED BY:                  Paid-in capital . . . . . . . . . . . . . . . . . . . . .                       $1,142,928,826

                                 Accumulated net realized gain (loss) on investments . . .                             (345,977)

                                                                                                                _______________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                       $1,142,582,849

                                                                                                                _______________

SHARES OUTSTANDING

(UNLIMITED NUMBER OF $.001 PAR VALUE SHARES OF BENEFICIAL INTEREST AUTHORIZED) . . . . . .                        1,142,640,052

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

                                                                                                                         ______


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>
DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF OPERATIONS                          YEAR ENDED DECEMBER 31, 1998

INVESTMENT INCOME
<S>                                                                                              <C>                <C>
INCOME                           Interest Income . . . . . . . . . . . . . . . . . . . . .                          $58,041,612

EXPENSES:                        Management fee--Note 2(a) . . . . . . . . . . . . . . . .       $  5,564,881

                                 Shareholder servicing costs--Note 2(b)  . . . . . . . . .          2,465,661

                                 Custodian fees  . . . . . . . . . . . . . . . . . . . . .             81,133

                                 Trustees' fees and expenses--Note 2(c)  . . . . . . . . .             66,923

                                 Prospectus and shareholders' reports  . . . . . . . . . .             65,561

                                 Registration fees . . . . . . . . . . . . . . . . . . . .             61,804

                                 Professional fees . . . . . . . . . . . . . . . . . . . .             33,980

                                 Miscellaneous . . . . . . . . . . . . . . . . . . . . . .             16,564
                                                                                                 ____________

                                    Total Expenses . . . . . . . . . . . . . . . . . . . .                            8,356,507
                                                                                                                   ____________

INVESTMENT INCOME--NET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                           49,685,105

NET REALIZED GAIN (LOSS) ON INVESTMENTS--Note 1(b) . . . . . . . . . . . . . . . . . . . .                             (153,399)

                                                                                                                   ____________

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS . . . . . . . . . . . . . . . . . . .                          $49,531,706
                                                                                                                   ____________


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>
DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF CHANGES IN NET ASSETS

                                                                                          Year Ended           Year Ended
                                                                                       December 31, 1998   December 31, 1997
                                                                                       __________________   __________________
<S>                                                                                    <C>                   <C>
OPERATIONS:

  Investment income--net . . . . . . . . . . . . . . . . . . . . . . . . . . . .       $     49,685,105      $    55,924,827

  Net realized gain (loss) on investments  . . . . . . . . . . . . . . . . . . .               (153,399)             (14,055)
                                                                                        _______________       ______________

    Net Increase (Decrease) in Net Assets Resulting from Operations  . . . . . .             49,531,706           55,910,772
                                                                                        _______________       ______________

DIVIDENDS TO SHAREHOLDERS FROM:

  Investment income--net . . . . . . . . . . . . . . . . . . . . . . . . . . . .            (49,685,105)         (55,924,827)
                                                                                        _______________       ______________

BENEFICIAL INTEREST TRANSACTIONS ($1.00 per share):

  Net proceeds from shares sold  . . . . . . . . . . . . . . . . . . . . . . . .          1,045,848,980        2,196,547,255

  Dividends reinvested . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             47,140,240           52,673,880

  Cost of shares redeemed  . . . . . . . . . . . . . . . . . . . . . . . . . . .         (1,154,200,701)      (2,332,113,265)
                                                                                        _______________       ______________

    Increase (Decrease) in Net Assets from Beneficial Interest Transactions  . .            (61,211,481)         (82,892,130)
                                                                                        _______________       ______________

       Total Increase (Decrease) in Net Assets . . . . . . . . . . . . . . . . .            (61,364,880)         (82,906,185)

NET ASSETS:

  Beginning of Period  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          1,203,947,729        1,286,853,914
                                                                                        _______________       ______________

  End of Period  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         $1,142,582,849       $1,203,947,729
                                                                                        _______________       ______________

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>


DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

FINANCIAL HIGHLIGHTS

   Contained  below  is  per  share  operating  performance  data for a share of
Beneficial  Interest outstanding, total investment return, ratios to average net
assets  and  other supplemental data for each period indicated. This information
has been derived from the Fund's financial statements.

<TABLE>
<CAPTION>

                                                                                   Year Ended December 31,
                                                                       ______________________________________________________

PER SHARE DATA:                                                    1998         1997         1996         1995          1994
                                                                  ______        ______       ______       ______       ______
<S>                                                               <C>          <C>          <C>          <C>          <C>
   Net asset value, beginning of period  . . . . . . . . . .      $ 1.00       $  1.00      $  1.00      $  1.00      $  1.00
                                                                  ______        ______       ______       ______       ______

   Investment Operations:

   Investment income--net  . . . . . . . . . . . . . . . . .        .045          .046         .046         .051         .033
                                                                  ______        ______       ______       ______       ______

   Distributions:

   Dividends from investment income--net . . . . . . . . . .       (.045)        (.046)       (.046)        (.051)      (.033)
                                                                  ______        ______       ______       ______       ______

   Net asset value, end of period  . . . . . . . . . . . . .     $  1.00       $  1.00      $  1.00      $  1.00      $  1.00
                                                                  ______        ______       ______       ______       ______

TOTAL INVESTMENT RETURN. . . . . . . . . . . . . . . . . . .        4.55%         4.74%        4.67%        5.19%        3.38%

RATIOS/SUPPLEMENTAL DATA:

   Ratio of expenses to average net assets . . . . . . . . .         .75%          .71%         .73%         .69%         .71%

   Ratio of net investment income to average net assets  . .        4.46%         4.64%        4.55%        5.09%        3.29%

   Net Assets, end of period (000's Omitted) . . . . . . . .   $1,142,583    $1,203,948   $1,286,854   $1,310,691   $1,450,739

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS

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. Premier Mutual Fund Services,  Inc.  is  the
distributor of the Fund's shares, which are sold to the public without a sales
charge.

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 represents amortized cost.
Under the terms of the custody agreement, the Fund received net earnings credits
of  $20,346  during  the  period ended December 31, 1998 based on available cash
balances  left  on  deposit. Income earned under this arrangement is included in
interest income.

   (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, if any, 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 $264,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized  subsequent  to  December 31, 1998. The
carryover  does not include net realized securities losses from November 1, 1998
through  December  31,  1998  which  are  treated,  for Federal tax purposes, as
arising  in  fiscal  1999.  If  not applied, $13,000 of the carryover expires in
fiscal 2003, $153,000 expires in fiscal 2004, $23,000 expires in fiscal 2005 and
$75,000 expires in fiscal 2006.

At December 31, 1998, 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.

DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

   (B)  Under the Shareholder Services Plan, the Fund reimburses Dreyfus Service
Corporation,  a  wholly-owned subsidiary of the Manager, 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
December  31,  1998, the Fund was charged $1,468,424 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  December 31, 1998, the Fund was charged $506,254 pursuant to the transfer
agency agreement.

   (C)  Each  trustee  who  is  not an "affiliated person" as defined in the Act
receives from the Fund an annual fee of $4,500 and an attendance fee of $500 per
meeting.  The  Chairman  of  the  Board  receives  an  additional  25%  of  such
compensation and the Trustee Emeritus receives 50% of such compensation.


DREYFUS 100% U.S. TREASURY MONEY MARKET FUND
- -----------------------------------------------------------------------------

REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

SHAREHOLDERS AND BOARD OF TRUSTEES

DREYFUS 100% U.S. TREASURY MONEY MARKET FUND

   We  have  audited  the  accompanying  statement  of assets and liabilities of
Dreyfus  100%  U.S.  Treasury  Money  Market  Fund,  including  the statement of
investments,  as  of  December 31, 1998, and the related statement of operations
for  the year then ended, the statement of changes in net assets for each of the
two  years  in  the  period then ended, and financial highlights for each of the
years indicated therein. These financial statements and financial highlights are
the responsibility of the Fund's management. Our responsibility is to express an
opinion  on  these  financial  statements  and financial highlights based on our
audits.

   We  conducted  our  audits  in  accordance  with  generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about  whether  the  financial  statements  and financial
highlights  are free of material misstatement. An audit includes examining, on a
test  basis,  evidence  supporting  the amounts and disclosures in the financial
statements  and  financial  highlights.  Our procedures included confirmation of
securities  owned  as of December 31, 1998 by correspondence with the custodian.
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  100%  U.S. Treasury Money Market Fund at December 31, 1998, the results
of  its  operations  for  the year then ended, the changes in its net assets for
each of the two years in the period then ended, and the financial highlights for
each  of  the  indicated years, in conformity with generally accepted accounting
principles.

New York, New York

February 5, 1999

IMPORTANT TAX INFORMATION (UNAUDITED)

   For  State individual income tax purposes, the Fund hereby designates 100% of
the  ordinary  income  dividends  paid during its fiscal year ended December 31,
1998  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.


                                   [reg.tm logo]

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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

90 Washington Street

New York, NY 10286

TRANSFER AGENT &

DIVIDEND DISBURSING AGENT

Dreyfus Transfer, Inc.

P.O. Box 9671

Providence, RI 02940









Printed in U.S.A.                                             071AR9812

100% U.S. Treasury

Money Market

Fund

Annual Report

December 31, 1998












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