DREYFUS NEW YORK TAX EXEMPT MONEY MARKET FUND/NY
N-30D, 2000-02-01
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Dreyfus
New York Tax Exempt
Money Market Fund


SEMIANNUAL REPORT November 30, 1999



(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

Year 2000 Issues (Unaudited)

The fund could be adversely affected if the computer systems used by Dreyfus and
the fund's other service providers do not properly process and calculate
date-related information from and after January 1, 2000. Dreyfus has taken steps
designed to avoid year 2000-related problems in its systems and to monitor the
readiness  of other service providers.  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.


                                 Contents

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

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Statement of Investments

                            10   Statement of Assets and Liabilities

                            11   Statement of Operations

                            12   Statement of Changes in Net Assets

                            13   Financial Highlights

                            14   Notes to Financial Statements

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

                                 Back Cover

                                                                       The Fund
                                                               Dreyfus New York
                                                   Tax Exempt Money Market Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We are pleased to present this semiannual report for Dreyfus New York Tax Exempt
Money  Market  Fund,  covering  the  six-month  period from June 1, 1999 through
November  30,  1999. 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, Joseph Irace.

When  the  reporting period began, investors were concerned that strong economic
growth  in  the  United States might rekindle dormant inflationary pressures. In
response, the Federal Reserve Board raised short-term interest rates three times
during  the  summer  and  fall  of  1999  in an attempt to forestall a potential
resurgence of inflation. These increases effectively reversed all of last fall's
interest-rate  cuts,  and  led to higher yields on most money market securities,
including tax-exempt instruments.

We  appreciate  your confidence over the past six months, and we look forward to
your  continued  participation in Dreyfus New York Tax Exempt Money Market Fund

Sincerely,


Stephen E. Canter
President and Chief Investment Officer
The Dreyfus Corporation
December 15, 1999




DISCUSSION OF FUND PERFORMANCE

Joseph Irace, Portfolio Manager

How did Dreyfus New York Tax Exempt Money Market Fund perform during the period

For  the  six-month  period  ended  November  30,  1999,  the  fund  produced an
annualized  tax-exempt  yield  of  2.52% . Taking  into  account  the effects of
compounding, the fund's annualized effective yield was 2.55%.(1)

What is the fund's investment approach?

The  fund' s  objective is to seek a high level of federal, New York  state  and
city  tax-exempt  income  while  maintaining  a stable $1.00 share price. We are
especially vigilant in our efforts to preserve capital.

In  pursuing this objective, we employ two primary strategies. First, we attempt
to  add  value  by  constructing  a diverse portfolio of high quality tax-exempt
money  market  instruments from New York issuers. Second, we actively manage the
fund'  s   average   maturity   in  anticipation  of  interest-rate  trends  and
supply-and-demand changes in the short-term municipal marketplace.

For  example, if we expect an increase in short-term supply, we may decrease the
average  maturity  of the fund, which would enable us to purchase new securities
with  higher yields.  Yields tend to rise when there is an increase of new issue
supply competing for investor interest. New securities are generally issued with
maturities  in  the  one-year  range, which tend to lengthen the fund's weighted
average  maturity.  If we anticipate limited new issue supply, we may extend the
portfolio' s  average  maturity  to  maintain  current  yields  for  as  long as
practical.   At other times we try to maintain an average maturity that reflects
our  view  of  short-term  interest-rate  trends  and  future supply-and- demand
considerations.

                                                             The Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

What other factors influenced the fund's performance?

The  fund  was  positively  affected  by rising interest rates over the past six
months. When the reporting period began, it had already become apparent that the
U.S.  economy  was  growing  more  strongly than most analysts expected, raising
concerns that inflationary pressures might re-emerge. In an attempt to forestall
a  reacceleration  of  inflation, the Federal Reserve Board increased short-term
interest  rates  three  times  during  the  summer and fall of 1999. Because the
market anticipated these rate hikes before they were announced, much of the rise
of  tax-exempt  money market yields had already taken place by the time the last
monetary    policy    change    was    actually   implemented   in   November.

However,  tax-exempt  money  market  yields  did  not rise as much as comparable
taxable  yields,  primarily  because  of  a  relative lack of supply amid steady
investor  demand.  New York State and its municipalities have enjoyed higher tax
revenues  during  this period of economic prosperity, which have enabled them to
decrease their annual debt borrowings.

What is the fund's current strategy?

We have continued to focus on very high quality, liquid money market instruments
from  a  wide  array  of  issuers.  Some of the most frequently used instruments
include Variable Rate Demand Notes (VRDNs), which are issued by investment banks
through  the  securitization  of  longer  term  municipal  bonds.   VRDNs can be
redeemed at the buyer's option after either one day or seven days, which affords
the fund a high degree of liquidity as well as high credit quality. Accordingly,
as of November 30, much of the portfolio was composed of VRDNs. The remainder of
the  portfolio was comprised primarily of tax-exempt commercial paper and notes.
Of course, the portfolio's composition will change over time.

Although we took advantage of new issuance of tax-exempt notes in June and July,
which  effectively  enabled  us  to lock in prevailing yields, we have generally
maintained    a    relatively    short    average    maturity

throughout  the  reporting  period  in  anticipation  of  higher interest rates.
Recently,  however, we have begun to extend the fund's average maturity in order
to  help  protect  the  fund  from  any  market  disruptions that Y2K-related or
year-end factors may present.

December 15, 1999

(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
ANY OTHER GOVERNMENT AGENCY. 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. INCOME MAY BE SUBJECT TO STATE AND LOCAL TAXES FOR NON-NEW YORK
RESIDENTS, AND SOME INCOME MAY BE SUBJECT TO THE FEDERAL ALTERNATIVE MINIMUM TAX
(AMT) FOR CERTAIN INVESTORS.

                                                             The Fund

STATEMENT OF INVESTMENTS

November 30, 1999 (Unaudited)

<TABLE>

                                                                                              Principal
TAX EXEMPT INVESTMENTS--98.7%                                                                Amount ($)               Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                           <C>                      <C>

Buffalo, RAN 4.65%, Series A, 7/25/2000

   (LOC;    Landesbank Hessen)                                                                4,000,000                4,021,553

Connetquot Central School District, TAN

   3.75%, 6/29/2000                                                                           8,000,000                8,017,400

Erie County Industrial Development Agency, IDR, VRDN

  (Luminescent System Inc., Project)

   3.75% (LOC; HSBC Bank)                                                                     3,500,000  (a)           3,500,000

Lakeland Central School Distict, BAN (Shrub Oak)

   4.375%, 11/22/2000                                                                         5,000,000                5,019,910

Long Island Power Authority, Electric Systems Revenue, CP:

  3.70%, Sub-Series 4, 2/10/2000

    (LOC: Bayerische Landesbank and Westdeutsche

      Landesbank)                                                                             6,000,000                6,000,000

   3.75%, Sub-Series 4, 2/10/2000

      (LOC: Bayerische Landesbank and Westdeutsche

      Landesbank)                                                                             2,400,000                2,400,000

   3.85%, Sub-Series 3, 2/18/2000

      (LOC: Bayerische Landesbank and Westdeutsche

      Landesbank)                                                                             1,000,000                1,000,000

   3.70%, Sub-Series 3, 2/29/2000

      (LOC: Bayerische Landesbank and Westdeutsche

      Landesbank)                                                                             8,000,000                8,000,000

McGraw Central School District 4.875%, 6/15/2000

   (Insured; AMBAC)                                                                             700,000                  702,947

Metropolitan Transportation Authority, Transportation

  Facility Revenue, CP:

      3.50%, Series 1, 2/8/2000 (LOC; ABN-Amro Bank)                                          5,000,000                5,000,000

      3.70%, Series 1, 2/18/2000 (LOC; ABN-Amro Bank)                                         1,000,000                1,000,000

Monroe County Industrial Development Agency, Revenue,

  VRDN (Enbi Corp.)

   4.15% (LOC; Rabobank Nederland)                                                            4,700,000  (a)           4,700,000

Monroe County Industrial Development Agency, IDR,

   VRDN (Illbruck Office) 3.85% (LOC; Key Bank)                                               4,270,000  (a)           4,270,000

New York City, VRDN:

  3.70%, Sub-Series E-4

      (LOC; State Street Bank and Trust Co.)                                                  9,800,000  (a)           9,800,000

   3.80%, Series B (Insured; MBIA and LOC; Bank of Austria)                                   2,100,000  (a)           2,100,000

   3.80%, Series B (Insured; MBIA and

      Liquidity Facility; Credit Agricole de Indosuez)                                       11,900,000  (a)          11,900,000

New York City Health and Hospital Corporation,

  Health Systems Revenue, VRDN:

      3.70%, Series E (LOC; The Bank of New York)                                             6,000,000  (a)           6,000,000

      3.80%, Series B (LOC; Canadian Imperial Bank of

         Commerce)                                                                            7,800,000  (a)           7,800,000


                                                                                              Principal

TAX EXEMPT INVESTMENTS (CONTINUED)                                                           Amount ($)                 Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------

New York City Industrial Development Agency, VRDN:

  Civil Facility Revenue (Mercy College Project)

      3.80% (LOC; The Bank of New York)                                                       1,500,000  (a)           1,500,000

   IDR (Stroheim & Roman Inc. Project)

      3.80% (LOC; Westdeutsche Landesbank)                                                    5,700,000  (a)           5,700,000

New York City Municipal Water Finance Authority:

  CP:

    3.60%, Series 1, 12/23/1999

         (LOC: Bank of Nova Scotia, Commerzbank and

         and Toronto-Dominion Bank)                                                           5,000,000                5,000,000

      3.70%, Series 1, 12/23/1999

         (LOC: Bank of Nova Scotia, Commerzbank and

         and Toronto-Dominion Bank)                                                           5,000,000                5,000,000

      3.80%, Series 1, 3/10/2000

         (LOC: Bank of Nova Scotia, Commerzbank and

         and Toronto-Dominion Bank)                                                           3,400,000                3,400,000

   Water and Sewer System Revenue, VRDN

      3.80%, Series C (Insured; FGIC and

      Liquidity Facility; FGIC)                                                               6,300,000  (a)           6,300,000

New York City Transitional Finance Authority, Revenue,

   VRDN 3.85%, Series A-2 (LOC; Bank of Nova Scotia)                                         10,000,000  (a)          10,000,000

New York City Trust, Cultural Resource Revenue, Refunding,

  VRDN (American Museum of Natural History)

   3.65%, Series A (BPA; Credit Suisse and Insured; MBIA)                                     5,765,000  (a)           5,765,000

State of New York, CP 3.80%, 2/9/2000

   (LOC; Westdeutsche Landesbank)                                                            13,000,000               13,000,000

New York State Dormitory Authority, Revenues, VRDN:

  (Memorial Sloan Kettering)

      3.70%, Series A (LOC; Chase Manhattan Bank)                                             3,900,000  (a)           3,900,000

   (Saint Francis at the Knolls)

      3.80% (LOC; Banque Paribas)                                                             7,600,000  (a)           7,600,000

New York State Energy Research and Development Authority,

  PCR, VRDN:

    (Niagara Mohawk Power Corp.):

         3.70%, Series B (LOC; Toronto-Dominion Bank)                                         5,400,000  (a)           5,400,000

         4%, Series A (LOC; Toronto-Dominion Bank)                                            5,150,000  (a)           5,150,000

         4.10%, Series B (LOC; Morgan Guaranty Trust Co.)                                     9,000,000  (a)           9,000,000

      Refunding (New York State Electric and Gas)

         3.70%, Series D (LOC; Bank One Corp.)                                                2,500,000  (a)           2,500,000

New York State Environmental Facilities Corporation, RRR,

  VRDN (Equity Huntington Project)

   3.85% (LOC; Union Bank of Switzerland)                                                     2,300,000  (a)           2,300,000

New York State Environmental Quality

   3%, Series G, 12/8/1999 (LOC; Westdeutsche Landesbank)                                     7,000,000                7,000,000

                                                                                                     The Fund

STATEMENT OF INVESTMENTS (Unaudited) (CONTINUED)

                                                                                              Principal
TAX EXEMPT INVESTMENTS (CONTINUED)                                                           Amount ($)                Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------

New York State Housing Finance Agency,

  Service Contract Obligation, VRDN

   3.75%, Series A (LOC; Commerzbank)                                                        11,000,000  (a)          11,000,000

New York State Local Government Assistance Corporation,

  VRDN:

    3.75%, Series A (LOC: Bayerische Landesbank and

         Westdeutsche Landesbank)                                                            15,000,000  (a)          15,000,000

      3.80%, Series F (LOC; Toronto-Dominion Bank)                                            9,800,000  (a)           9,800,000

New York State Medical Care Facilities Finance Agency,

  Revenue, VRDN (Pooled Equipment Loan Program)

   3.55%, Series 1 (LOC; Chase Manhattan Bank)                                                2,200,000  (a)           2,200,000

Port Authority of New York and New Jersey,

  Special Obligation Revenue, VRDN

  (Versatile Structure Obligation):

      3.45%, Series 6 (LOC; Bank of Nova Scotia)                                                300,000  (a)             300,000

      3.65%, Series 3 (LOC; Bank of Nova Scotia)                                              2,000,000  (a)           2,000,000

      3.85%, Series 6 (LOC; Bank of Nova Scotia)                                             12,900,000  (a)          12,900,000

Rockland County, G.O. Notes

   5.125%, 10/15/2000 (Insured; FGIC)                                                         1,052,000                1,063,367

Sachem Central School District, TAN (Holbrook)

   4%, 6/29/2000                                                                              8,000,000                8,024,543

Schenectady County Industrual Development Agency, IDR,

  VRDN (Super Steel Inc., Project)

   3.85%, Series A (LOC; Key Bank)                                                            1,800,000  (a)           1,800,000

Smithtown Central School District, TAN 3.75%, 6/26/2000                                       5,000,000                5,011,260

Westchester County, TAN 2.83%, Series 1, 12/30/1999                                          12,000,000               12,000,090

Westhampton Beach Union Free School District, TAN

   4.25%, 6/30/2000                                                                           2,950,000                2,954,998
- ------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $273,801,068)                                                             98.7%              273,801,068

CASH AND RECEIVABLES (NET)                                                                         1.3%                3,498,496

NET ASSETS                                                                                       100.0%              277,299,564


Summary of Abbreviations

AMBAC               American Municipal Bond                             MBIA                 Municipal Bond
                        Assurance Corporation                                                    Investors Assurance
BAN                 Bond Anticipation Notes                                                      Insurance Corporation
BPA                 Bond Purchase Agreement                             PCR                  Pollution Control Revenue
CP                  Commercial Paper                                    RAN                  Revenue Anticipation Notes
FGIC                Federal Guaranty Insurance Company                  RRR                  Resources Recovery Revenue
GO                  General Obligation                                  TAN                  Tax Anticipation Notes
IDR                 Industrial Development Revenue                      VRDN                 Variable Rate Demand Notes
LOC                 Letter of Credit

Summary of Combined Ratings (Unaudited)

Fitch                or          Moody's               or        Standard & Poor's                           Value (%)
- ------------------------------------------------------------------------------------------------------------------------------------

F1+/F1                           VMIG1/MIG1, P1                  SP1+/SP1, A1+/A1                                 85.5
AAA/AAA(b)                       Aaa/Aa, A1(b)                   AAA/A(b)                                          4.0
Not Rated(c)                     Not Rated(c)                    Not Rated(c)                                     10.5
                                                                                                                 100.0

(A)  SECURITIES PAYABLE ON DEMAND.  VARIABLE INTEREST  RATE--SUBJECT TO PERIODIC
     CHANGE.

(B)  NOTES WHICH ARE NOT F, MIG OR SP RATED ARE  REPRESENTED  BY BOND RATINGS OF
     THE ISSUERS.

(C)  SECURITIES WHICH,  WHILE NOT RATED BY FITCH,  MOODY'S AND STANDARD & POOR'S
     HAVE BEEN  DETERMINED BY THE MANAGER TO BE OF  COMPARABLE  QUALITY TO THOSE
     RATED SECURITIES IN WHICH THE FUND MAY INVEST.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

STATEMENT OF ASSETS AND LIABILITIES

November 30, 1999 (Unaudited)

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

ASSETS ($):

Investments in securities--See Statement of
Investments                                           273,801,068   273,801,068

Cash                                                                  2,774,416

Interest receivable                                                   1,573,993

Prepaid expenses                                                         11,654

                                                                    278,161,131
- --------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                           129,724

Payable for investment securities purchased                             705,032

Accrued expenses                                                         26,811

                                                                        861,567
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      277,299,564
- --------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                     277,363,467

Accumulated net realized gain (loss) on investments                    (63,903)
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      277,299,564
- --------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares of Beneficial Interest authorized)
277,363,467

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

SEE NOTES TO FINANCIAL STATEMENTS.


STATEMENT OF OPERATIONS

Six Months Ended November 30, 1999 (Unaudited)

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

INVESTMENT INCOME ($):

INTEREST INCOME                                                      4,584,393

EXPENSES:

Management fee--Note 2(a)                                              719,823

Shareholder servicing costs--Note 2(b)                                 160,120

Professional fees                                                       24,005

Custodian fees                                                          17,237

Prospectus and shareholders' reports                                    12,469

Trustees' fees and expenses--Note 2(c)                                   9,445

Registration fees                                                        5,886

Miscellaneous                                                            4,363

TOTAL EXPENSES                                                         953,348

INVESTMENT INCOME--NET, REPRESENTING NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS                                          3,631,045

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

STATEMENT OF CHANGES IN NET ASSETS

                                         Six Months Ended
                                        November 30, 1999           Year Ended
                                              (Unaudited)         May 31, 1999
- --------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                          3,631,045            7,398,312

Net realized gain (loss) from investments             --               (1,432)

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                    3,631,045            7,396,880
- --------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                        (3,631,045)          (7,398,312)
- --------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($1.00 PER SHARE):

Net proceeds from shares sold                 143,690,258          388,327,235

Dividends reinvested                            3,462,574            6,959,328

Cost of shares redeemed                     (165,643,373)         (380,768,904)

INCREASE (DECREASE) IN NET ASSETS FROM
   BENEFICIAL INTEREST TRANSACTIONS          (18,490,541)           14,517,659

TOTAL INCREASE (DECREASE) IN NET ASSETS      (18,490,541)           14,516,227
- --------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of period                           295,790,105          281,273,878

END OF PERIOD                                 277,299,564          295,790,105

SEE NOTES TO FINANCIAL STATEMENTS.


FINANCIAL HIGHLIGHTS

The  following table describes the performance for the fiscal periods indicated.
Total  return shows how much our 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
                                         November 30, 1999                                   Year Ended May 31,
                                                                 -------------------------------------------------------------------
                                                (Unaudited)      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                                 .013       .025           .029          .028           .030          .027

Distributions:

Dividends from
   investment income--net                             (.013)     (.025)         (.029)        (.028)         (.030)        (.027)

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

TOTAL RETURN (%)                                      2.53(a)    2.54           2.97          2.83           3.05          2.76
- ------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                  .66(a)     .65            .67           .68            .64           .68

Ratio of net investment income
   to average net assets                              2.51(a)    2.50           2.93          2.79           3.00          2.71
- ------------------------------------------------------------------------------------------------------------------------------------

Net Assets,
   end of period ($ x 1,000)                        277,300   295,790        281,274       291,529        298,768        317,840

(A) ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--Significant Accounting Policies:

Dreyfus  New  York Tax Exempt Money Market Fund (the "fund") is registered under
the Investment Company Act of 1940, as amended (the "Act"), as a non-diversified
open-end  management  investment  company. The fund's investment objective is to
provide  investors  with  as high a level of current income exempt from Federal,
New  York  State  and  New  York  City  income  taxes  as is consistent with the
preservation   of   capital  and  the  maintenance  of  liquidity.  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.  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. Interest income, adjusted for amortization of
premiums  and original issue discounts on investments, is earned from settlement
date and recognized on the accrual basis. Realized gain and loss from securities
transactions  are  recorded  on  the  identified cost basis. Cost of investments
represents  amortized  cost.  Under the terms of the custody agreement, the fund
received  net  earnings  credits of $10,734 during the period ended November 30

1999  based on available cash balances left on deposit. Income earned under this
arrangement is included in interest income.

The  fund  follows  an  investment  policy  of  investing primarily in municipal
obligations  of  one  state. Economic changes affecting the state and certain of
its  public  bodies  and municipalities may affect the ability of issuers within
the  state to pay interest on, or repay principal of, municipal obligations held
by the fund.

(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, which can distribute tax exempt dividends, by
complying  with the applicable provisions of the Code, and to make distributions
of  income  and  net  realized  capital  gain  sufficient  to  relieve  it  from
substantially all Federal income and excise taxes.

The fund has an unused capital loss carryover of approximately $47,000 available
for  Federal  income  tax  purposes  to be applied against future net securities
profits,  if any, realized subsequent to May 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,  $2,000  of  the  carryover  expires in fiscal 2002, $27,000 expires in
fiscal  2003,  $7,000  expires  in  fiscal  2004, $3,000 expires in fiscal 2005,
$4,000 expires in fiscal 2006 and $4,000 expires in fiscal 2007.

At  November  30,  1999, 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

NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

NOTE 2--Management Fee and Other Transactions

With Affiliates:

(A)  Pursuant  to  a  management  agreement  ("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. The Agreement provides
that if in any full fiscal year the aggregate expenses of the fund, exclusive of
taxes,  brokerage,  interest  on  borrowings  and extraordinary expenses, exceed
11_2% of the value of the fund's average net assets the fund may deduct from the
payments  to  be  made  to  the  Manager,  or  the Manager will bear such excess
expense.  During  the  period  ended  November  30,  1999,  there was no expense
reimbursement pursuant to the Agreement.

(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
November  30,  1999,  the  fund  was charged $93,372 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  November  30, 1999, the fund was charged $52,088 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 $1,500 and an attendance fee of $250 per
meeting.  The  Chairman  of  the  Board  receives  an  additional  25%  of  such
compensation.


                                                           For More Information

                        Dreyfus New York Tax Exempt
                        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

                        Premier Mutual Fund Services, Inc.
                        60 State Street
                        Boston, MA 02109

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                                  273SA9911





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