DREYFUS MONEY MARKET INSTRUMENTS INC
N-30D, 1998-08-25
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DREYFUS MONEY MARKET INSTRUMENTS, INC.
- -----------------------------------------------------------------------------

LETTER TO SHAREHOLDERS

Dear Shareholder:

We are pleased to report the performance for Dreyfus Money Market Instruments,
Inc.  for  the  six-month  period  ended June 30, 1998 as shown in the following
table:
<TABLE>
                                                                          ANNUALIZED                    ANNUALIZED

                                                                            YIELD                     EFFECTIVE YIELD*

                                                                          _________                    _____________
<S>                                                                         <C>                             <C>
        Money Market Series                                                 4.75%                           4.85%

        Government Securities Series                                        4.83%                           4.94%
</TABLE>
THE ECONOMY AND MARKET ENVIRONMENT

  A  major  influence  on  the  money  market  in  the  past few months has been
increased  evidence  of  a  slowdown  in general economic activity. Overall, the
economy appears to be healthy, the job market has been strong, consumers seem to
be  in  a constructive frame of mind and inflation has remained at bay. However,
the  fast  pace  of  expansion  that  prevailed  earlier in the year has clearly
cooled.

The problems in Japan and Southeast Asia are finally having some repercussions
in this country. Demand for our exports from that part of the world has declined
sharply. Furthermore, the flight to the dollar which has resulted from the Asian
problems has made the U.S. dollar very expensive for those trading partners.

  Lately,  the virtual shutdown of U.S. production at General Motors plants, due
to  the UAW strike in Flint, Michigan, has been another factor reducing the pace
of the economy.

  Although  growth  in  corporate  profits has slowed in many sectors during the
past  year,  consensus  estimates  of future profit growth continue to be cut by
several analysts. Profit margins had already begun to shrink under the weight of
rising labor costs, making companies' reported profits increasingly dependent on
growth  of  sales. Overall profits could thus prove quite vulnerable to a period
of significantly slower economic growth.

  In  view  of  this  cooling trend, it has come as no surprise that the Federal
Reserve  Board, though still watchful for signs of wage inflation, has not taken
any recent action to raise interest rates.

  Thus,  the  money  market  is  feeling the effects of economic cross-currents.
Factors  tending  to  restrain  interest  rates  include  the  demand  for  U.S.
instruments  from  foreign  investors  seeking  a  "safe  haven"  as well as the
prospect of the U.S. Government running a budget surplus, thus reducing the need
for  Treasury borrowing. Yet, we believe that the continuing economic expansion,
albeit at a slower rate, helped to keep money market rates from going lower than
they did during the reporting period.

PORTFOLIO FOCUS

In this market environment, we have maintained an average maturity in both the
Money  Market  Series and Government Securities Series approximating that of our
peer  group.  This  is  a moderately defensive strategy which we feel is wise at
this  juncture.  Of course, we will look to vary our approach should new factors
in the market make this desirable.

               Sincerely,


               [Patricia A. Larkin signature logo]


               Patricia A. Larkin

               Senior Portfolio Manager

July 15, 1998

New York, N.Y.

*Annualized  effective  yield  is  based  upon  dividends  declared  daily  and
reinvested monthly.

<TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC., MONEY MARKET SERIES
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS                            JUNE 30, 1998 (UNAUDITED)

                                                                                                   Principal

Negotiable Bank Certificates of Deposit--4.4%                                                       Amount           Value
- -------------------------------------------------------

                                                                                                _____________      ____________

SwedBank (Yankee)

 5.79%, 10/2/98
<S>                                                                                            <C>               <C>
  (cost $5,000,000)                                                                            $    5,000,000    $    5,000,000

                                                                                                                  =============


Commercial Paper--46.7%
- -------------------------------------------------------

Associates Corp. of North America

  6.25%, 7/1/98                                                                                $    4,000,000    $    4,000,000

Commonwealth Bank of Australia

  5.64%, 10/28/98                                                                                   5,000,000         4,915,208

FINOVA Capital Corp.

  5.63%, 10/16/98                                                                                   5,000,000         4,917,967

General Electric Capital Corp.

  5.52%, 7/31/98                                                                                    5,000,000         4,977,625

General Electric Capital Services

  5.59%, 9/4/98                                                                                     5,000,000         4,950,979

General Motors Acceptance Corp.

  5.54%, 9/2/98                                                                                     4,000,000         3,962,340

Goldman Sachs Group L.P.

  5.60%, 9/18/98                                                                                    5,000,000         4,939,653

Hertz Corp.

  5.57%, 7/16/98                                                                                    5,000,000         4,988,521

Merrill Lynch & Co. Inc.

  5.52%, 7/28/98                                                                                    5,000,000         4,979,900

Paine Webber Group Inc.

  5.71%, 9/8/98                                                                                     6,000,000         5,936,175

Prudential Funding Corp.

  6.42%, 7/1/98                                                                                     4,000,000         4,000,000

                                                                                                                  _____________

TOTAL COMMERCIAL PAPER

  (cost $52,568,368)                                                                                              $  52,568,368

                                                                                                                  =============

Bank Notes--22.2%
- -------------------------------------------------------

BankBoston, N.A.

  5.71%, 12/10/98(a)                                                                           $    5,000,000    $    5,000,000

Bankers Trust N.Y. Corp.

  5.65%, 3/19/99(a)                                                                                 5,000,000         4,998,598

Huntington National Bank

  5.60%, 12/8/98(a)                                                                                 5,000,000         4,997,961

Key Bank N.A.

  5.62%, 2/24/99(a)                                                                                 5,000,000         4,997,783
</TABLE>
<TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC., MONEY MARKET SERIES
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS (CONTINUED)                JUNE 30, 1998 (UNAUDITED)

                                                                                                   Principal

Bank Notes (continued)                                                                              Amount            Value
- -------------------------------------------------------

                                                                                                _____________      ____________

Societe Generale N.A. Inc.
<S>                                                                                            <C>               <C>
  5.63%, 2/23/99(a)                                                                            $    5,000,000    $    4,998,734

                                                                                                                  _____________

TOTAL BANK NOTES

  (cost $24,993,076)                                                                                              $  24,993,076

                                                                                                                  =============

Corporate Notes--13.3%
- -------------------------------------------------------

CTN Trust Series 1

  5.66%, 9/2/98(a,b,c)                                                                         $    4,990,000    $    4,992,803

Heller Financial Inc.

  5.80%, 4/13/99(a)                                                                                 5,000,000         5,000,000

Lehman Brothers Holdings Inc.

  5.67%-5.71%, 3/5/99-3/22/99(a)                                                                    5,000,000         5,000,786

                                                                                                                  _____________

TOTAL CORPORATE NOTES

  (cost $14,993,589)                                                                                              $  14,993,589

                                                                                                                  =============

U.S. Government Agencies--4.5%
- -------------------------------------------------------

Federal Farm Credit Bank

Floating Rate Notes

 5.67%, 10/23/98(a)

  (cost $4,999,148)                                                                            $    5,000,000    $    4,999,148

                                                                                                                  =============
Time Deposits--7.8%
- -------------------------------------------------------

Berliner Handels-und Frankforter Bank (Grand Cayman)

  6.25%, 7/1/98                                                                                $    4,000,000    $    4,000,000

Republic National Bank of New York (London)

  5.71%, 7/1/98                                                                                     4,731,000         4,731,000

                                                                                                                  _____________

TOTAL TIME DEPOSITS

  (cost $8,731,000)                                                                                              $    8,731,000

                                                                                                                  =============

TOTAL INVESTMENTS

  (cost $111,285,181)                                                                98.9%                         $111,285,181

                                                                                    ======                        =============


CASH AND RECEIVABLES (NET)                                                            1.1%                       $    1,224,489

                                                                                    ======                        =============

NET ASSETS                                                                          100.0%                         $112,509,670

                                                                                    ======                        =============

Notes to Statement of Investments:
- -----------------------------------------------------------------------------

(a)  Variable interest rate-subject periodic change.

(b)This  note  was  acquired  for investment, not with intent to distribute or
 sell.

(c)Security  restricted  as  to  public  resale. This security was acquired on
 12/15/97  at  a  cost of 100.2327. At June 30, 1998 the aggregate value of this
 security  is  $4,992,803,  representing approximately 4.4% of net assets and is
 valued at amortized cost.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC., GOVERNMENT SECURITIES SERIES
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS                            JUNE 30, 1998 (UNAUDITED)

                                              Annualized

                                               Yield on

                                                Date of  Principal

U.S. Treasury Bills--12.2%                                                    Purchase            Amount            Value
- ---------------------------------------------------------------------------

                                                                             ___________       _____________     _____________

   8/20/98
<S>                                                                            <C>             <C>               <C>
       (cost $49,662,500)                                                      4.89%           $  50,000,000     $  49,662,500

                                                                                                                ==============


U.S. Treasury Notes--41.9%
- ----------------------------------------------

   8.25%, 7/15/98                                                              5.40%            $  25,000,000     $  25,022,763

   6.25%, 7/31/98                                                               5.46               30,000,000        30,014,107

   6.00%, 9/30/98                                                               5.48               25,000,000        25,021,193

   5.125%, 11/30/98                                                             5.63               20,000,000        19,954,934

   5.00%, 2/15/99                                                               5.89               21,000,000        20,931,103

   6.375%, 7/15/99                                                        .     5.25               50,000,000        50,415,775

                                                                                                                  _____________

TOTAL U.S. TREASURY NOTES

   (cost $171,359,875)                                                                                             $171,359,875

                                                                                                                  =============

Repurchase Agreements--45.5%
- ----------------------------------------------

Bear Stearns & Co.

  dated 6/30/98, due 7/1/98 in the amount of $45,007,313

  (fully collateralized by $46,670,000 U.S. Treasury

   Bills, due 12/17/98, value $45,557,050)                                     5.85%              $45,000,000     $  45,000,000

CIBC Oppenheimer Corp.

  dated 6/30/98, due 7/1/98 in the amount of$45,007,038

  (fully collateralized by $44,101,000 U.S. Treasury

   Notes, 5.875%-8.875%, due 10/31/98-2/15/99, value $45,553,234)               5.63               45,000,000        45,000,000

Donaldson, Lufkin & Jenrette Securities, Inc.

  dated 6/30/98, due 7/1/98 in the amount of $45,007,188

  (fully collateralized by $44,780,000 U.S. Treasury

   Notes, 5.00%, due 2/15/99, value$45,419,074)                                 5.75               45,000,000        45,000,000

J.P. Morgan Securities Inc.

  dated 6/30/98, due 7/1/98 in the amount of $45,007,188

  (fully collateralized by $48,444,000 U.S. Treasury

   Bills, due 6/24/99, value $45,985,050)                                       5.75               45,000,000        45,000,000

SBC Warburg Dillon Read Inc.

  dated 6/30/98, due 7/1/98 in the amount of $6,204,913

  (fully collateralized by $6,235,000 U.S. Treasury

   Notes, 6.75%, due 5/31/99, value $6,338,842)                                 5.30                6,204,000         6,204,000

                                                                                                                  _____________

TOTAL REPURCHASE AGREEMENTS

   (cost $186,204,000)                                                                                             $186,204,000

                                                                                                                  =============

TOTAL INVESTMENTS

   (cost $407,226,375)                                             99.6%                                           $407,226,375

                                                                   =====                                          =============


CASH AND RECEIVABLES (NET)                                           .4%                                         $    1,705,817

                                                                   =====                                          =============

NET ASSETS                                                        100.0%                                           $408,932,192

                                                                   =====                                          =============

                       SEE NOTES TO FIANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC.
- -----------------------------------------------------------------------------

STATEMENT OF ASSETS AND LIABILITIES                 JUNE 30, 1998 (UNAUDITED)

                                                                                                  Money           Government

                                                                                                  Market          Securities

                                                                                                  Series            Series

                                                                                               _____________     _____________

ASSETS:                          Investments in securities, at value (including repurchase
                                   agreements of $186,204,000 for the Government
<S>                                                                                              <C>               <C>
                                   Securities Series)--Note 2(b)                                 $111,285,181      $407,226,375

                                 Cash                                                               1,031,763         2,393,528

                                 Interest receivable                                                  373,149         4,019,385

                                                                                                _____________     _____________

                                                                                                  112,690,093       413,639,288

                                                                                                _____________     _____________

LIABILITIES:                     Due to The Dreyfus Corporation and affiliates                        102,077           305,340

                                 Payable for shares of Common Stock redeemed                               --         4,218,812

                                 Accrued expenses and other liabilities                                78,346           182,944

                                                                                                _____________     _____________

                                                                                                      180,423         4,707,096

                                                                                                _____________     _____________

NET ASSETS                                                                                       $112,509,670      $408,932,192

                                                                                                =============     =============


REPRESENTED BY:                  Paid-in capital                                                 $112,533,764      $408,931,743

                                 Accumulated net realized gain (loss) on investments                  (24,094)              449

                                                                                                _____________     _____________

NET ASSETS                                                                                       $112,509,670      $408,932,192

                                                                                                =============     =============

                               NET ASSET VALUE PER SHARE

                              _____________________________

                                                                                                  Money             Government

                                                                                                  Market            Securities

                                                                                                  Series              Series

                                                                                                _____________     _____________

Net Assets                                                                                       $112,509,670      $408,932,192

Shares Outstanding                                                                                112,517,264       408,931,743

NET ASSET VALUE PER SHARE                                                                               $1.00             $1.00

                                                                                                       ======            ======


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC.
- -----------------------------------------------------------------------------

STATEMENT OF OPERATIONS            SIX MONTHS ENDED JUNE 30, 1998 (UNAUDITED)


                                                                                                  Money             Government

                                                                                                  Market            Securities

                                                                                                  Series              Series

                                                                                                _____________     _____________

INVESTMENT INCOME
<S>                                                                                              <C>                <C>
INCOME                           Interest Income                                                 $  3,244,041       $11,325,451

                                                                                                 ____________      ____________

EXPENSES--Note 2(c):             Management fee--Note 3(a)                                      $     285,171      $  1,017,008

                                 Shareholder servicing costs--Note 3(b)                               168,749           381,525

                                 Professional fees                                                     32,914               638

                                 Registration fees                                                     18,964            21,673

                                 Custodian fees                                                        14,309            40,168

                                 Directors' fees and expenses--Note 3(c)                                8,118            26,568

                                 Prospectus and shareholders' reports                                   6,201             7,238

                                 Miscellaneous                                                          1,916                --

                                                                                                 ____________      ____________

                                    Total Expenses                                                    536,342         1,494,818

                                                                                                 ____________      ____________

INVESTMENT INCOME--NET                                                                              2,707,699         9,830,633

NET REALIZED GAIN (LOSS) ON INVESTMENTS--Note 2(b)                                                    (1,836)               696

                                                                                                 ____________      ____________

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                                             $  2,705,863      $  9,831,329

                                                                                                 ============      ============


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>

DREYFUS MONEY MARKET INSTRUMENTS, INC.
- -----------------------------------------------------------------------------

STATEMENT OF CHANGES IN NET ASSETS

                                  Money Market Series  Government Securities Series

                                                       ___________________________________  __________________________________

                                                       Six Months Ended      Year Ended     Six Months Ended     Year Ended

                                                         June 30, 1998      December 31,      June 30, 1998     December 31,

                                                          (Unaudited)           1997           (Unaudited)          1997

                                                       ________________   _______________  ________________   _______________

OPERATIONS:
<S>                                                     <C>              <C>               <C>                <C>
  Investment income--net                                $     2,707,699  $      6,057,427  $      9,830,633   $    19,697,451

  Net realized gain (loss) on investments                        (1,836)           (3,878)              696             7,009

                                                       ________________   _______________  ________________   _______________

    Net Increase (Decrease) in Net Assets

       Resulting from Operations                              2,705,863        6,053,549          9,831,329        19,704,460

                                                       ________________   _______________  ________________   _______________

DIVIDENDS TO SHAREHOLDERS FROM:

  Investment income--net                                     (2,707,699)       (6,057,427)       (9,830,633)      (19,697,451)

                                                       ________________   _______________  ________________   _______________

CAPITAL STOCK TRANSACTIONS :

 ($1.00 per share):

  Net proceeds from shares sold                             133,918,869       301,641,056       626,835,877     1,411,479,603

  Dividends reinvested                                        1,854,621         4,474,950         5,808,304        12,621,559

  Cost of shares redeemed                                  (142,029,025)     (316,689,108)     (604,704,502)   (1,484,884,885)

                                                       ________________   _______________  ________________   _______________

    Increase (Decrease) in Net Assets from
       Capital Stock Transactions                            (6,255,535)      (10,573,102)       27,939,679       (60,783,723)

                                                       ________________   _______________  ________________   _______________

    Total Increase (Decrease) in
       Net Assets                                            (6,257,371)      (10,576,980)       27,940,375       (60,776,714)

                                                       ________________   _______________  ________________   _______________

NET ASSETS:

  Beginning of Period                                       118,767,041       129,344,021       380,991,817       441,768,531

                                                       ________________   _______________  ________________   _______________

  End of Period                                       $     112,509,670   $   118,767,041  $    408,932,192   $   380,991,817

                                                       ================   ================ ================   ================


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC., MONEY MARKET SERIES
- -----------------------------------------------------------------------------

FINANCIAL HIGHLIGHTS

  Contained  below is per share operating performance data for a share of Common
Stock  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.


                                                      Six Months Ended

                                                        June 30, 1998                       Year Ended December 31,

                                                                            ___________________________________________________

PER SHARE DATA:                                           (Unaudited)        1997       1996       1995       1994      1993

                                                         __________         ______     ______     ______    ______     ______
<S>                                                        <C>             <C>        <C>       <C>        <C>        <C>
   Net asset value, beginning of period                    $  1.00         $  1.00    $  1.00   $  1.00    $  1.00    $  1.00

                                                            ______          ______     ______     ______    ______     ______

   Investment Operations:

   Investment income--net                                     .024            .047       .046      .053       .034       .026

                                                            ______          ______     ______     ______    ______     ______

   Distributions:

   Dividends from investment income--net                     (.024)          (.047)     (.046)     (.053)    (.034)     (.026)

                                                            ______          ______     ______     ______    ______     ______

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

                                                            ======          ======     ======     ======    ======     ======


TOTAL INVESTMENT RETURN                                       4.80%*          4.76%      4.73%      5.46%     3.42%      2.64%

RATIOS/SUPPLEMENTAL DATA:

   Ratio of expenses to average net assets                     .94%*          1.00%       .93%       .84%      .88%       .83%

   Ratio of net investment income
       to average net assets                                  4.75%*          4.66%      4.63%      5.33%     3.35%      2.62%

   Decrease reflected in above expense ratios
       due to undertakings by the Manager                        --            .01%         --        --         --         --

   Net Assets, end of period (000's Omitted)               $112,510       $118,767    $129,344  $144,172   $170,548   $207,537
- -----------------------------

*  Annualized.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC., GOVERNMENT SECURITIES SERIES
- -----------------------------------------------------------------------------

FINANCIAL HIGHLIGHTS (CONTINUED)

  Contained  below is per share operating performance data for a share of Common
Stock  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.


                                                      Six Months Ended

                                                        June 30, 1998                       Year Ended December 31,

                                                                            ___________________________________________________

PER SHARE DATA:                                           (Unaudited)        1997       1996       1995       1994      1993

                                                         __________         ______     ______     ______    ______     ______
<S>                                                        <C>             <C>        <C>       <C>        <C>        <C>
   Net asset value, beginning of period                    $  1.00         $  1.00    $  1.00   $  1.00    $  1.00    $  1.00

                                                            ______          ______     ______     ______    ______     ______

   Investment Operations:

   Investment income--net                                     .024            .046       .045      .051       .033       .025

                                                            ______          ______     ______     ______    ______     ______

   Distributions:

   Dividends from investment income--net                     (.024)          (.046)     (.045)     (.051)    (.033)     (.025)

                                                            ______          ______     ______     ______    ______     ______

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

                                                            ======          ======     ======     ======    ======     ======

TOTAL INVESTMENT RETURN                                       4.88%*          4.72%      4.60%      5.18%     3.31%      2.48%

RATIOS/SUPPLEMENTAL DATA:

   Ratio of expenses to average net assets                     .73%*           .87%       .90%       .83%      .88%       .80%

   Ratio of net investment income
       to average net assets                                  4.83%*          4.62%      4.50%      5.07%     3.24%      2.46%

   Net Assets, end of period (000's Omitted)              $408,932        $380,992   $441,769   $431,444  $465,956   $520,708
- -----------------------------

*  Annualized.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
DREYFUS MONEY MARKET INSTRUMENTS, INC.
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

NOTE 1--GENERAL:

  Dreyfus  Money  Market  Instruments, Inc. (the "Fund") is registered under the
Investment  Company  Act  of  1940  ("Act") as a diversified open-end management
investment  company  and  operates  as  a  series company issuing two classes of
Common  Stock: the Money Market Series and the Government Securities Series. The
Fund  accounts  separately  for  the  assets, liabilities and operations of each
series.  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. The Dreyfus Corporation ("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. The Fund is authorized to
issue  5  billion  shares  of  $.01  par value Common Stock for the Money Market
Series  and  10 billion shares of $.01 par value Common Stock for the Government
Securities Series.

  It  is the Fund's policy to maintain a continuous net asset value per share of
$1.00  for  each  series;  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 for each series.

  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.

NOTE 2--SIGNIFICANT ACCOUNTING POLICIES:

  (A)  PORTFOLIO  VALUATION:  Investments  in securities are valued at amortized
cost,  which  has  been determined by the Fund's Board of Directors 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  custodian agreement, the Money Market Series and the
Government  Securities  Series received net earnings credits of $272 and $2,797,
respectively,  during  the  period  ended  June 30, 1998 based on available cash
balances  left  on  deposit. Income earned under this arrangement is included in
interest income.

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

DREYFUS MONEY MARKET INSTRUMENTS, INC.
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

  (C)  EXPENSES:  Expenses  directly  attributable to each series are charged to
that  series'  operations;  expenses  which  are  applicable  to both series are
allocated between them.

  (D)  DIVIDENDS  TO SHAREHOLDERS: It is the policy of the Fund, with respect to
both  series,  to  declare dividends from investment income-net on each business
day;  such dividends are paid monthly. Dividends from net realized capital gain,
with  respect  to both series, are normally declared and paid annually, but each
series  may  make  distributions  on  a  more  frequent basis to comply with the
distribution  requirements  of the Internal Revenue Code. However, to the extent
that  a  net  realized capital gain of either series can be reduced by a capital
loss carryover of that series, such gain will not be distributed.

  (E)  FEDERAL  INCOME  TAXES:  It  is  the policy of each series 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  Internal  Revenue  Code,  and  to  make  distributions  of  taxable  income
sufficient to relieve it from substantially all Federal income and excise taxes.

  The  Money Market Series has an unused capital loss carryover of approximately
$22,000  available  for Federal income tax purposes to be applied against future
net securities profits, if any, realized subsequent to December 31, 1997. If not
applied,  $18,000  of the carryover expires in fiscal 2004 and $4,000 expires in
fiscal 2005.

  The  Government  Securities  Series  has  an  unused capital loss carryover of
approximately  $3,700  available  for  Federal income tax purposes to be applied
against  future  net securities profits, if any, realized subsequent to December
31, 1997. If not applied, the carryover expires in fiscal 2004.

  At  June  30,  1998, the cost of investments of each series for Federal income
tax  purposes  was  substantially  the  same as the cost for financial reporting
purposes (see the Statements of Investments).

NOTE 3--MANAGEMENT FEE AND OTHER TRANSACTIONS WITH AFFILIATES:

  (A)  Pursuant  to  a  management agreement ("Agreement") with the Manager, the
management  fee  for  each series is computed at the annual rate of .50 of 1% of
the value of the average daily net assets of each series and is payable monthly.
The Agreement provides that if in any full fiscal year the aggregate expenses of
either series, exclusive of taxes, brokerage commissions, interest on borrowings
and extraordinary expenses, exceed 1% of the value of such series' average daily
net  assets, the Fund may deduct from payments to be made to the Manager, or the
Manager  will  bear  the  amount  of  such  excess. No expense reimbursement was
required pursuant to the Agreement for the period ended June 30, 1998.

  (B)  Under  the  Shareholder  Services  Plan,  each  series 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 each series' 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  DREYFUS  MONEY  MARKET
INSTRUMENTS, INC.
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

accounts. During the period ended June 30, 1998, the Money Market Series and the
Government  Securities  Series  were charged $79,975 and $216,060, respectively,
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,  1998,  the  Money  Market Series and the Government Securities
Series,  were  charged  $55,990  and  $110,854,  respectively,  pursuant  to the
transfer agency agreement.

  (C)  Each  director  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.


[dreyfus lion "d" logo]                          (reg.tm)

[dreyfus logo]                                   (reg.tm)

DREYFUS MONEY MARKET

INSTRUMENTS, INC.

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.                                          008/060SA986

Money Market

Instruments, Inc.

Semi-Annual

Report

June 30, 1998



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