DREYFUS MIDCAP INDEX FUND
N-30D, 1999-01-12
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DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------


LETTER TO SHAREHOLDERS

Dear Shareholder:

  We  are  pleased to provide you with this annual report for the Dreyfus MidCap
Index Fund for the 12-month period ended October 31, 1998. As you know, it was a
turbulent  year  in  the stock market, particularly for mid-cap stocks. Even so,
your  Fund produced a total return of 5.88%,* as compared with a total return of
6.71%  for  the  Standard & Poor's MidCap 400 Index, the Fund's benchmark.** The
difference  in  performance is accounted for by transaction costs and other Fund
expenses.

ECONOMIC REVIEW

So far in 1998, the main regions of the world have 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.  The  U.S.  economy  cooled enough over the months that the Fed decided to
stand  pat.  Evidence  of  economic  cooling continued to accumulate and worries
about  the  world economy intensified. Financial stresses pushed the Fed to ease
credit  in  both  late  September  and  mid-October.  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 the Asian financial crisis. The Latin
American  economies  weakened  as  the financial stresses spread throughout that
region.

  A  main  influence  on  the  U.S.  economy this year was the foreign financial
crisis  and 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 helped the consumer sector as more of the growth in consumer income
was  left  over  after  inflation to buy goods and services. Consumers benefited
from  a  combination  of  good  growth in income after inflation, a strong labor
market and past increases in the price of assets they owned.

  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.  One  result of this industrial weakness was to cool off a
U.S.    economy    that    had    been    growing    rapidly.

  The  major  change  in  the  economic  outlook  over  recent months has been a
downward  shift  in  expectations  for  world  economic  growth. A credit crunch
developed in emerging countries and former communist countries, sharply reducing
the   economic   outlook   for   Asia   and   Latin   America  as  well  as  for
commodity-exporting countries throughout the world. The effect on Europe and the
U.S. has been to lower expectations of profit growth and drive down bond yields

  Evidence  of  a  weaker  world  economy  accumulated 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, proactive steps were taken to stabilize
the  Japanese  banks,  design  a  support  package  for Brazil and ease monetary
policy. The prospects for world economic weakness and monetary ease in the major
countries  will  be  powerfully influenced by whether foreign financial stresses
calm  down or intensify in the coming months. There appears to be a shift in the
priorities   of   key   policymakers   from   fighting  potential  inflation  to
restimulating future world economic growth.

MARKET OVERVIEW

  The  12  months ended October 31, 1998, encompassed some very different market
phases.  There  was  stock  market strength during the early part of the period.
Then  small-cap  indices  started  to  erode  in  the  spring and were joined by
large-cap  indices  by  midsummer.  A  sharp decline until the end of August was
followed  by  a  brief  rebound  and then a renewed decline amid financial fears
until early October. The last few weeks of the fiscal year saw a strong rally in
response  to  the easing of monetary policy. Over the 12-month period, the total
return on the Standard & Poor's Stock Price Index was 22.01%. Returns on mid-cap
and  small-cap  stock  indices  tended  to  be weaker than on large-caps, with a
negative total return on small-cap indices.

  Three  key  trends  influenced  stock  market behavior during the fiscal year.
First,  the  Federal Reserve kept the Federal Funds rate flat at 5.5% for nearly
11  months  of the fiscal year, but then eased policy twice. Second, weakness in
emerging  country economies contributed to declining commodity prices and a drop
in  long-term  Treasury bond yields to multidecade lows. Third, expectations for
corporate  profits dropped, first in the sectors sensitive to Asian developments
such as oil, basic materials and exports, and then for a broader list of stocks

  The  trigger  for  the  sharp  decline  in stocks in August appeared to be the
Russian default in the summer of 1998. This resulted in deepening concerns about
weaker  economic  growth  and  corporate profits. There was also a global margin
call on risky assets held by hedge funds and financial institutions. This raised
the  cost  of  debt financing for many corporations and many emerging countries.
Expectations  for  economic  activity  in  emerging  countries in Asia and Latin
America  shifted  down  sharply  while  expectations  for U.S. corporate profits
weakened  somewhat.  Despite  the fall in Treasury bond yields, financial stocks
led  the summer selloff due to concerns about financial contagion among emerging
countries  and  potential loan losses by financial institutions. However, in the
last few weeks of the fiscal year, these fears began to ebb and the stock market
rebounded.

  The  erosion  of  expectations  about average corporate profit growth over the
last  year contributed to an outperformance by a small group of super-cap growth
stocks  for  much  of  the  fiscal  year.  Investors  had more confidence in the
prospect  for  strong  persistent earnings growth for this small group of stocks
than  for  the  broad  market.  Value  stocks, which often have greater cyclical
sensitivity  to  earnings fluctuations, lagged behind these super-growth stocks.
In addition, many of the financial stocks that fall into the value category fell
sharply following the Russian default and global margin call concerns.

  The  fiscal  year  ended  October 31, 1998 was characterized by very different
performances  of  the  various market sectors. Super-cap growth stocks did best,
followed  by  large-cap  stocks  in  general  with  mid-cap and small-cap stocks
lagging behind. For example, the total return for the fiscal year on the Russell
1000  Index  with a heavy large-cap representation was 19.71%, while the Russell
1000  Growth  Index  returned  24.64%  and the Russell 1000 Value Index returned
14.83% . The  return  on the Russell Midcap Index was 4.46%, while the small-cap
Russell 2000 Index return was -11.84%.***

PORTFOLIO FOCUS

  The  Dreyfus MidCap Index Fund is designed to provide returns in line with the
S&P MidCap 400 Index. Stocks in this category, as noted earlier, had a difficult
year,  significantly underperforming large-capitalization stocks. A strong rally
in mid-cap stocks in October helped year-over-year returns significantly.

  We thank you for being an investor in this Dreyfus Fund.

               Sincerely,


               [signature logo Steven A. Falci]


               Steven A. Falci

               Portfolio Manager

November 24, 1998

New York, N.Y.

*   Total return includes reinvestment of dividends and any capital gains paid.

**SOURCE:  LIPPER  ANALYTICAL  SERVICES,  INC. -- Reflects the reinvestment of
income dividends and, where applicable, capital gain distributions. The Standard
&  Poor' s  Midcap 400 Index is a broad-based index of 400 companies with market
capitalizations  generally  ranging  from  $50  million  to $10 billion and is a
widely accepted, unmanaged index of overall mid-cap stock market performance.

***  SOURCE: LIPPER ANALYTICAL SERVICES, INC. -- The Russell 1000 Index measures
the  performance of the 1,000 largest companies in the Russell 3000 Index, which
represent  approximately  89%  of the total market capitalization of the Russell
3000  Index.  The  Russell  1000  Growth Index measures the performance of those
Russell  1000  companies  with higher price-to-book ratios and higher forecasted
growth  values.  The  Russell 1000 Value Index measures the performance of those
Russell  1000  companies  with  lower  price-to-book ratios and lower forecasted
growth values. The Russell Midcap Index consists of the bottom 800 securities in
the  Russell 1000 Index as ranked by total market capitalization and is a widely
accepted  measure of medium-cap stock market performance. The Russell 2000 Index
is  composed  of  the  2,000  smallest  companies in the Russell 3000 Index. The
Russell  3000 Index is composed of 3,000 of the largest U.S. companies by market
capitalization. All indices are unmanaged and include reinvested dividends.


DREYFUS MIDCAP INDEX FUND                                    OCTOBER 31, 1998
- -----------------------------------------------------------------------------

COMPARISON OF CHANGE IN VALUE OF $10,000 INVESTMENT IN DREYFUS MIDCAP INDEX FUND
   WITH THE STANDARD & POOR'S MIDCAP 400 INDEX AND THE STANDARD & POOR'S 500
                          COMPOSITE STOCK PRICE INDEX

                                    Dollars

$35,410

Standard & Poor's 500 Composite Stock Price Index*

$31,597

Standard & Poor's MidCap 400 Index*

$29,489

Dreyfus MidCap Index Fund

*Source: Lipper Analytical Services, Inc.

Average Annual Total Returns
- --------------------------------------------------------------------------------



     One Year Ended           Five Years Ended         From Inception (6/19/91)
     October 31, 1998          October 31, 1998         to October 31, 1998
    __________________        __________________        __________________

         5.88%                      14.95%                      15.81%
- --------------

Past performance is not predictive of future performance.

The  above graph compares a $10,000 investment made in Dreyfus MidCap Index Fund
on  6/19/91  (Inception  Date)  to a $10,000 investment made on that date in the
Standard  & Poor' s  MidCap  400  Index  as well as to the Standard & Poor's 500
Composite Stock Price Index which are described below. For comparative purposes,
the  value  of  each Index on 6/30/91 is used as the beginning value on 6/19/91.
All dividends and capital gain distributions are reinvested.

The Fund's performance shown in the line graph takes into account all applicable
fees and expenses. The Standard & Poor's MidCap 400 Index is a broad-based index
of  400 companies with market capitalizations generally ranging from $50 million
to $10 billion and is a widely accepted, unmanaged index of overall midcap stock
market  performance.  The  Fund holds stocks in generally the same proportion as
the  stocks  within  the Index itself. The Standard & Poor's 500 Composite Stock
Price  Index  is  a  widely  accepted,  unmanaged  index of overall stock market
performance.  The  Indices  do  not  take  into  account charges, fees and other
expenses.  Further  information  relating to Fund performance, including expense
reimbursements,  if applicable, is contained in the Financial Highlights section
of the Prospectus and elsewhere in this report.


DREYFUS MIDCAP INDEX FUND
- --------------------------------------------------------------------------------

STATEMENT OF INVESTMENTS OCTOBER 31, 1998

     Shares                   COMMON STOCKS--90.6%                    Value
________________                                                _______________

                              Basic Industries--5.9%

                19,800  (a)   Airgas . . . . . . . . . . . . . .  $     227,700

                13,200        Albemarle  . . . . . . . . . . . .        251,625

                 1,400  (a)   American Standard  . . . . . . . .         44,713

                14,710        Bowater  . . . . . . . . . . . . .        600,352

                18,900        Cabot  . . . . . . . . . . . . . .        530,381

                11,089        Calgon Carbon  . . . . . . . . . .         78,316

                 6,633        CalMat . . . . . . . . . . . . . .        155,461

                 5,891        Chesapeake . . . . . . . . . . . .        206,185

                33,016        Clayton Homes  . . . . . . . . . .        509,685

                25,042        Consolidated Papers  . . . . . . .        602,573

                20,676        Crompton & Knowles . . . . . . . .        332,108

                12,400  (a)   Cytec Industries . . . . . . . . .        297,600

                 6,443        Dexter . . . . . . . . . . . . . .        188,458

                23,200        Ethyl  . . . . . . . . . . . . . .        127,600

                10,079        Ferro  . . . . . . . . . . . . . .        257,015

                 3,842        Fuller (H.B.)  . . . . . . . . . .        158,002

                11,551        GenCorp  . . . . . . . . . . . . .        255,566

                 8,579        Georgia Gulf . . . . . . . . . . .        146,379

                25,700        Georgia Pacific (Timber Group) . .        570,219

                11,700        Glatfelter (P.H.)  . . . . . . . .        144,056

                 7,625        Granite Construction . . . . . . .        254,008

                13,802        Hanna (M.A.) . . . . . . . . . . .        202,717

                31,722        IMC Global . . . . . . . . . . . .        824,772

                 7,121  (a)   Jacobs Engineering Group . . . . .        232,323

                 9,446        Lawter International . . . . . . .         72,026

                14,336        Longview Fibre . . . . . . . . . .        172,032

                15,488        Lubrizol . . . . . . . . . . . . .        431,728

                21,838        Lyondell Petrochemical . . . . . .        368,516

                 6,200        Minerals Technologies  . . . . . .        282,488

                 1,517        NCH  . . . . . . . . . . . . . . .        103,915

                13,240        Olin . . . . . . . . . . . . . . .        366,583

                27,813        RPM  . . . . . . . . . . . . . . .        467,606

                 7,800        Rayonier . . . . . . . . . . . . .        305,663

                 9,625        Schulman (A.)  . . . . . . . . . .        191,297

                33,700        Solutia  . . . . . . . . . . . . .        739,294

                28,393        Sonoco Products  . . . . . . . . .        805,651

                10,641        Southdown  . . . . . . . . . . . .        579,269

                28,100  (a)   Sybron International . . . . . . .        695,475

                19,500        Unisource Worldwide  . . . . . . .        179,156

                 9,400        Vulcan Materials . . . . . . . . .      1,115,075

                16,113        Wausau-Mosinee Paper . . . . . . .        280,970

                 8,661        Wellman  . . . . . . . . . . . . .        108,804

                16,016        Witco  . . . . . . . . . . . . . .        301,301

                                                                  _____________

                                                                     14,764,663
                                                                  _____________


STATEMENT OF INVESTMENTS (CONTINUED) OCTOBER 31, 1998

     Shares                   COMMON STOCKS (CONTINUED)               Value

________________                                                   _____________
                              Capital Goods--27.4%

                16,500        AGCO . . . . . . . . . . . . . . . .   156,750

                 9,122        AMETEK . . . . . . . . . . . . . . .   193,272

                15,900  (a)   ACNielsen  . . . . . . . . . . . . .   425,325

                37,312  (a)   ADC Telecommunications . . . . . . .   858,176

                 8,448        Albany International, Cl. A  . . . .   154,176

                              Capital Goods (continued)

                48,800  (a)   Allied Waste Industries  . . . . . .  $ 1,055,300

                27,104  (a)   Altera . . . . . . . . . . . . . . .    1,128,204

                61,000        America Online . . . . . . . . . . .    7,750,779

                26,500  (a)   American Power Conversion  . . . . .    1,124,594

                22,300        American Water Works . . . . . . . .      712,206

                45,226  (a)   Analog Devices . . . . . . . . . . .      898,867

                26,562  (a)   Arrow Electronics  . . . . . . . . .      579,384

                27,600  (a)   Atmel  . . . . . . . . . . . . . . .      319,125

                10,704        Avnet  . . . . . . . . . . . . . . .      532,524

                59,010  (a)   Cadence Design System  . . . . . . .    1,261,339

                15,800  (a)   Cambridge Technology Partners  . . .      349,575

                27,220        Cintas . . . . . . . . . . . . . . .    1,456,270

                17,628  (a)   Cirrus Logic . . . . . . . . . . . .      171,322

                11,700  (a)   Citrix Systems . . . . . . . . . . .      829,238

                42,276        Comdisco . . . . . . . . . . . . . .      652,636

                50,800  (a)   Compuware  . . . . . . . . . . . . .    2,752,725

                12,100  (a)   Comverse Technology  . . . . . . . .      556,600

                10,142        Cordant Technologies . . . . . . . .      412,653

                11,300  (a)   Corrections Corporation of America  .     217,525

                16,100  (a)   Covance  . . . . . . . . . . . . . .      448,788

                25,218  (a)   Cypress Semiconductor  . . . . . . .      280,550

                37,204        Danaher  . . . . . . . . . . . . . .    1,485,835

                19,201        Diebold  . . . . . . . . . . . . . .      598,831

                13,608        Donaldson  . . . . . . . . . . . . .      247,496

                16,800  (a)   Electronic Arts  . . . . . . . . . .      690,900

                12,713        Federal Signal . . . . . . . . . . .      305,907

                17,560  (a)   First Health Group . . . . . . . . .      404,978

                22,800  (a)   Fiserv . . . . . . . . . . . . . . .    1,060,200

                10,915  (a)   Flowserve  . . . . . . . . . . . . .      196,470

                28,200  (a)   FORE Systems . . . . . . . . . . . .      440,625

                11,500  (a)   GTECH Holdings . . . . . . . . . . .      276,000

                12,746        Harsco . . . . . . . . . . . . . . .      417,432

                18,280        Hubbell  . . . . . . . . . . . . . .      728,915

                 8,109  (a)   Information Resources  . . . . . . .       64,365

                33,000  (a)   Informix . . . . . . . . . . . . . .      168,094

                22,800  (a)   Intergrated Device Technology  . . .      158,175

                16,300  (a)   Intuit . . . . . . . . . . . . . . .      823,150

                 9,088        Kaydon . . . . . . . . . . . . . . .      319,216

                 3,100  (a)   Keane  . . . . . . . . . . . . . . .      103,075

                10,585        Kelly Services, Cl. A  . . . . . . .      332,766

                 8,300        Kennametal . . . . . . . . . . . . .      172,225

                18,500  (a)   Lexmark International Group,  Cl. A     1,293,844

                21,340        Linear Technology  . . . . . . . . .    1,272,398

                12,800  (a)   Litton Industries  . . . . . . . . .      835,200

                 8,726  (a)   MagneTek . . . . . . . . . . . . . .      110,711

                22,400        Manpower . . . . . . . . . . . . . .      540,400

                15,007        Mark IV Industries . . . . . . . . .      230,733

                36,400  (a)   Maxim Integrated Products  . . . . .    1,299,025

                12,000  (a)   Medaphis . . . . . . . . . . . . . .       39,000

STATEMENT OF INVESTMENTS (CONTINUED) OCTOBER 31, 1998

     Shares                   COMMON STOCKS (CONTINUED)               Value

________________                                                   ____________

                              Capital Goods (continued)

                18,209  (a)   Mentor Graphics  . . . . . . . . . . $    146,810

                15,800  (a)   Microchip Technology . . . . . . . .      427,588

                 2,200  (a)   Modis Professional Services  . . . .       38,775

                43,563        Molex  . . . . . . . . . . . . . . .    1,554,655

                28,200  (a)   NCR  . . . . . . . . . . . . . . . .      948,225

                19,200  (a)   NOVA . . . . . . . . . . . . . . . .      554,400

                36,100  (a)   Networks Associates  . . . . . . . .    1,534,250

                 4,568        Nordson  . . . . . . . . . . . . . .      204,704

                13,900        Ogden  . . . . . . . . . . . . . . .      373,563

                22,550        Olsten . . . . . . . . . . . . . . .      207,178

                10,740        Pentair  . . . . . . . . . . . . . .      404,093

                11,400        Pittston Brinks Group  . . . . . . .      339,150

                 2,900  (a)   Platinum Technology  . . . . . . . .       47,669

                10,254  (a)   Policy Management Systems  . . . . .      465,916

                 6,723        Precision Castparts  . . . . . . . .      295,812

                17,200        Premark International  . . . . . . .      545,025

                19,400  (a)   QUALCOMM . . . . . . . . . . . . . .    1,079,125

                47,306  (a)   Quantum  . . . . . . . . . . . . . .      827,855

                20,980  (a)   Quintiles Transnational  . . . . . .      949,345

                25,650  (a)   Robert Half International  . . . . .    1,029,206

                 9,105        Rollins  . . . . . . . . . . . . . .      157,061

                 8,500  (a)   SPX  . . . . . . . . . . . . . . . .      462,719

                16,700  (a)   SCI Systems  . . . . . . . . . . . .      659,650

                20,621  (a)   Sensormatic Electronics  . . . . . .      115,993

                 2,836  (a)   Sequa, Cl. A . . . . . . . . . . . .      181,504

                12,082  (a)   Sequent Computer Systems . . . . . .      119,310

                24,400  (a)   Siebel Systems . . . . . . . . . . .      498,675

                32,500  (a)   Solectron  . . . . . . . . . . . . .    1,860,625

                15,818        Sotheby's Holdings, Cl. A  . . . . .      342,064

                25,411  (a)   Sterling Commerce  . . . . . . . . .      895,738

                22,100  (a)   Sterling Software  . . . . . . . . .      578,744

                 7,726        Stewart & Stevenson Services . . . .      105,750

                27,100        Stewart Enterprises  . . . . . . . .      624,994

                25,926  (a)   Storage Technology . . . . . . . . .      866,901

                10,069  (a)   Structural Dynamics Research . . . .      144,742

                15,726        Sundstrand . . . . . . . . . . . . .      738,139

                28,900  (a)   SunGuard Data Systems  . . . . . . .      975,375

                15,976  (a)   Symantec . . . . . . . . . . . . . .      255,616

                16,311        Symbol Technologies  . . . . . . . .      729,917

                18,600  (a)   Synopsys . . . . . . . . . . . . . .      841,650

                13,500  (a)   Tech Data  . . . . . . . . . . . . .      531,563

                 6,000        Tecumseh Products, Cl. A . . . . . .      312,000

                10,400        Teleflex . . . . . . . . . . . . . .      402,350

                23,344  (a)   Teradyne . . . . . . . . . . . . . .      758,680

                12,051        Trinity Industries . . . . . . . . .      447,393

                30,600  (a)   U.S. Filter  . . . . . . . . . . . .      648,338

                 6,200  (a)   UCAR International . . . . . . . . .      111,600

                 8,238        Varian Associates  . . . . . . . . .      322,312

                27,600        Viad . . . . . . . . . . . . . . . .      757,275

                17,869  (a)   Vishay Intertechnology . . . . . . .      270,269


                              Capital Goods (continued)

                7,482         Watts Industries, Cl. A  . . . . . . $    137,482

               20,066  (a)    Xilinx . . . . . . . . . . . . . . .      896,072

               11,350         York International . . . . . . . . .      427,044

                                                                    ___________

                                                                     69,044,758
                                                                    ___________

                             Consumer Cyclical--12.7%

               15,200  (a)   Abercrombie & Fitch, Cl. A . . . . . .     603,250

                6,768        Arvin Industries . . . . . . . . . . .     268,182

                6,300        Bandag . . . . . . . . . . . . . . . .     222,863

                8,186        Banta  . . . . . . . . . . . . . . . .     203,627

               19,000  (a)   Barnes & Noble . . . . . . . . . . . .     619,875

               38,600  (a)   Bed Bath & Beyond  . . . . . . . . . .   1,063,913

               34,764        Belo (A.H.), Cl. A . . . . . . . . . .     632,270

               27,900  (a)   Best Buy . . . . . . . . . . . . . . .   1,339,200

               10,507  (a)   BJ's Wholesale Club  . . . . . . . . .     377,595

               11,544        Bob Evans Farms  . . . . . . . . . . .     227,273

                1,500  (a)   Borders Group  . . . . . . . . . . . .      38,063

                6,500        Borg-Warner Automotive . . . . . . . .     304,688

               18,371  (a)   Brinker International  . . . . . . . .     444,349

               12,700  (a)   Buffets  . . . . . . . . . . . . . . .     137,319

               17,300  (a)   Burlington Industries  . . . . . . . .     160,025

               20,900        Callaway Golf  . . . . . . . . . . . .     227,288

                8,432        Carlisle Cos.  . . . . . . . . . . . .     325,686

                9,066  (a)   Chris-Craft Industries . . . . . . . .     404,004

               26,473  (a)   Circus Circus Enterprises  . . . . . .     296,167

               14,152        Claire's Stores  . . . . . . . . . . .     239,700

               13,200  (a)   CompUSA  . . . . . . . . . . . . . . .     183,150

               17,325        Cracker Barrel Old Country Store . . .     448,284

               16,400        Dollar Tree Stores . . . . . . . . . .     632,425

               47,870        Family Dollar Stores . . . . . . . . .     867,644

               10,500        Fastenal . . . . . . . . . . . . . . .     379,313

               14,817        Federal-Mogul  . . . . . . . . . . . .     802,896

                9,200  (a)   General Nutrition  . . . . . . . . . .     133,975

               11,700        Hannaford Brothers . . . . . . . . . .     512,606

               42,424        Harley-Davidson  . . . . . . . . . . .   1,643,930

               16,370        Heilig-Meyers  . . . . . . . . . . . .     125,844

               17,122        HON Industries . . . . . . . . . . . .     362,772

                8,506        Houghton Mifflin . . . . . . . . . . .     331,734

               31,476        International Game Technology  . . . .     710,177

               23,300  (a)   Jones Apparel Group  . . . . . . . . .     401,925

                8,448  (a)   Lands' End . . . . . . . . . . . . . .     144,144

                1,600  (a)   Lear . . . . . . . . . . . . . . . . .      51,400

               12,400        Lee Enterprises  . . . . . . . . . . .     337,125

               54,692        Leggett & Platt  . . . . . . . . . . .   1,278,426

               10,900  (a)   Lone Star Steakhouse/Saloon  . . . . .      87,200

                7,400        Media General, Cl. A . . . . . . . . .     331,150

               19,200        Meritor Automotive . . . . . . . . . .     358,800

                9,600  (a)   Micro Warehouse  . . . . . . . . . . .     209,400

               24,160        Miller (Herman)  . . . . . . . . . . .     533,030

                8,220        Modine Manufacturing . . . . . . . . .     269,205

               10,000  (a)   Nine West Group  . . . . . . . . . . .     126,875


STATEMENT OF INVESTMENTS (CONTINUED) OCTOBER 31, 1998

     Shares                   COMMON STOCKS (CONTINUED)               Value

________________                                                   ____________

                              Consumer Cyclical (continued)

                 5,688        OEA  . . . . . . . . . . . . . . . .       63,635

                68,468  (a)   Office Depot . . . . . . . . . . . .    1,711,700

                34,600  (a)   OfficeMax  . . . . . . . . . . . . .      315,725

                13,700  (a)   Outback Steakhouse . . . . . . . . .      474,363

                 9,700  (a)   Payless ShoeSource . . . . . . . . .      455,294

                24,223  (a)   Promus Hotel . . . . . . . . . . . .      772,108

                21,552        Reynolds & Reynolds, Cl. A . . . . .      387,936

                13,200        Ross Stores  . . . . . . . . . . . .      429,000

                13,000        Ruddick  . . . . . . . . . . . . . .      252,688

                39,330  (a)   Saks . . . . . . . . . . . . . . . .      894,758

                 5,700        Sbarro . . . . . . . . . . . . . . .      133,950

                 4,500  (a)   Scholastic . . . . . . . . . . . . .      177,469

                34,032        Shaw Industries  . . . . . . . . . .      591,306

                 7,907        Standard Register  . . . . . . . . .      226,832

                24,800  (a)   Starbucks  . . . . . . . . . . . . .    1,075,700

                 7,700        Superior Industries International  .      201,644

                13,896        TCA Cable TV . . . . . . . . . . . .      384,746

                 9,738        Tiffany  . . . . . . . . . . . . . .      314,659

                12,800  (a)   U.S. Foodservice . . . . . . . . . .      608,000

                 6,712  (a)   U.S. Office Products . . . . . . . .       51,599

                17,137        Unifi  . . . . . . . . . . . . . . .      289,187

                12,114        Wallace Computer Services  . . . . .      264,994

                17,600        Warnaco Group, Cl. A . . . . . . . .      449,900

                 2,769        Washington Post, Cl. B . . . . . . .    1,470,339

                16,400  (a)   Westpoint Stevens  . . . . . . . . .      466,375

                                                                    ___________

                                                                     31,862,674

                                                                    ___________

                              Consumer Staples--3.8%

                 5,388        Church & Dwight  . . . . . . . . . .      165,344

                11,177        Dean Foods . . . . . . . . . . . . .      523,922

                28,600        Dial . . . . . . . . . . . . . . . .      788,288

                16,743        Dole Food  . . . . . . . . . . . . .      504,383

                 7,528        Dreyers Grand Ice Cream  . . . . . .       98,805

                 4,478        Enesco Group . . . . . . . . . . . .      113,629

                11,016        First Brands . . . . . . . . . . . .      415,854

                27,725        Flowers Industries . . . . . . . . .      568,363

                20,800        Hormel Foods . . . . . . . . . . . .      677,300

                25,700        IBP  . . . . . . . . . . . . . . . .      695,506

                11,300  (a)   Imation  . . . . . . . . . . . . . .      199,869

                20,200        Interstate Bakeries  . . . . . . . .      506,263

                 5,177        International Multifoods . . . . . .      107,746

                11,999        Lancaster Colony . . . . . . . . . .      359,970

                 8,345        Lance  . . . . . . . . . . . . . . .      159,598

                20,436        McCormick & Co.  . . . . . . . . . .      634,793

                 8,120        Smucker (J.M.), Cl. A  . . . . . . .      178,640

                64,266        Tyson Foods, Cl. A . . . . . . . . .    1,478,118

                 9,766        Universal  . . . . . . . . . . . . .      362,563

                14,228        Universal Foods  . . . . . . . . . .      308,570

                12,600  (a)   Vlasic Foods International . . . . .      235,463

                28,200        Whitman  . . . . . . . . . . . . . .      604,538

                                                                    ___________

                                                                      9,687,525
                                                                    ___________

                              Energy--6.4%

                15,862        AGL Resources  . . . . . . . . . . .      332,111

                20,070  (a)   BJ Services  . . . . . . . . . . . .      410,181

                33,500        El Paso Energy . . . . . . . . . . .    1,187,156

                39,100        ENSCO International  . . . . . . . .      525,406

                48,100  (a)   Global Marine  . . . . . . . . . . .      595,238

                 8,325        Indiana Energy . . . . . . . . . . .      186,272

                44,094        KeySpan Energy . . . . . . . . . . .    1,317,308

                12,500        KN Energy  . . . . . . . . . . . . .      621,094

                36,014        LG&E Energy  . . . . . . . . . . . .      949,869

                21,980        MCN  . . . . . . . . . . . . . . . .      424,489

                12,482        Murphy Oil . . . . . . . . . . . . .      515,663

                28,000  (a)   Nabors Industries  . . . . . . . . .      518,000

                10,637        National Fuel Gas  . . . . . . . . .      502,598

                15,877        Noble Affiliates . . . . . . . . . .      519,972

                36,500  (a)   Noble Drilling . . . . . . . . . . .      627,344

                 7,800  (a)   Ocean Energy . . . . . . . . . . . .       97,500

                21,337  (a)   Parker Drilling  . . . . . . . . . .      105,351

                 7,100        Pioneer Natural Resources  . . . . .      106,944

                10,086        Quaker State . . . . . . . . . . . .      142,465

                22,896        Questar  . . . . . . . . . . . . . .      450,765

                34,982  (a)   Ranger Oil . . . . . . . . . . . . .      223,010

                17,520  (a)   Seagull Energy . . . . . . . . . . .      209,145

                13,410  (a)   Smith International  . . . . . . . .      481,922

                16,205        Tidewater  . . . . . . . . . . . . .      458,804

                43,469        Tosco  . . . . . . . . . . . . . . .    1,219,849

                27,900        Transocean Offshore  . . . . . . . .    1,030,556

                25,100        Ultramar Diamond Shamrock  . . . . .      676,131

                14,900        UtiliCorp United . . . . . . . . . .      535,469

                15,576        Valero Energy  . . . . . . . . . . .      389,400

                17,930  (a)   Varco International  . . . . . . . .      193,868

                12,160        Washington Gas Light . . . . . . . .      321,480

                 9,523  (a)   Weatherford International  . . . . .      258,907

                                                                    ___________

                                                                     16,134,267
                                                                    ___________


                              Health Care--9.0%

                 7,795  (a)   Acuson . . . . . . . . . . . . . . .      117,412

                 8,600  (a)   Agouron Pharmaceuticals  . . . . . .      333,250

                31,400        Allegiance . . . . . . . . . . . . .    1,167,688

                14,400  (a)   Apria Healthcare Group . . . . . . .       58,500

                 7,912        Beckman Coulter  . . . . . . . . . .      371,864

                14,038        Bergen Brunswig, Cl. A . . . . . . .      685,230

                28,700  (a)   Beverly Enterprises  . . . . . . . .      193,725

                20,452  (a)   Biogen . . . . . . . . . . . . . . .    1,421,414

                12,551        Carter-Wallace . . . . . . . . . . .      222,780

                19,597  (a)   Centocor . . . . . . . . . . . . . .      872,067

                49,380  (a)   Chiron . . . . . . . . . . . . . . .    1,111,050

                13,100  (a)   Concentra Managed Care . . . . . . .      134,275

                14,700        DENTSPLY International . . . . . . .      378,525

                22,400  (a)   Forest Laboratories  . . . . . . . .      936,600

                20,620  (a)   Foundation Health  . . . . . . . . .      242,285

                21,958  (a)   Genzyme  . . . . . . . . . . . . . .      923,608


STATEMENT OF INVESTMENTS (CONTINUED) OCTOBER 31, 1998

     Shares                   COMMON STOCKS (CONTINUED)               Value

________________                                                   ____________

                              Health Care (continued)

                69,800  (a)   Health Management Association  . . .  $ 1,243,313

                18,800        Hillenbrand Industries . . . . . . .    1,112,725

                33,250  (a)   IVAX . . . . . . . . . . . . . . . .      315,875

                 2,900        ICN Pharmaceuticals  . . . . . . . .       67,788

                17,600  (a)   Lincare Holdings . . . . . . . . . .      702,900

                26,400        McKesson . . . . . . . . . . . . . .    2,032,800

                34,198        Mylan Laboratories . . . . . . . . .    1,177,694

                17,148  (a)   NovaCare . . . . . . . . . . . . . .       70,736

                24,600        Omnicare . . . . . . . . . . . . . .      850,238

                11,300  (a)   Oxford Health Plans  . . . . . . . .      133,481

                12,736  (a)   PacifiCare Health Systems, Ser. B  .    1,002,960

                20,700  (a)   Perrigo  . . . . . . . . . . . . . .       164,306

                19,300  (a)   PSS World Medical  . . . . . . . . .       427,013

                20,900  (a)   Quorum Health Group  . . . . . . . .       303,050

                19,000  (a)   Steris . . . . . . . . . . . . . . .       437,000

                26,750        Stryker  . . . . . . . . . . . . . .     1,121,828

                22,400  (a)   Total Renal Care Holdings  . . . . .       548,800

                11,500  (a)   Trigon Healthcare  . . . . . . . . .       431,250

                24,800  (a)   Watson Pharmaceuticals . . . . . . .     1,379,500

                                                                    ___________

                                                                      22,693,530
                                                                    ___________


                              Interest Sensitive--13.4%

                74,168        AFLAC  . . . . . . . . . . . . . . .    2,827,655

                19,400        AMBAC  . . . . . . . . . . . . . . .    1,128,838

                17,059        American Financial Group . . . . . .      598,131

                17,625        Associated Banc-Corp . . . . . . . .      619,078

                11,300  (a)   CCB Financial  . . . . . . . . . . .      594,663

                37,134        Charter One Financial  . . . . . . .    1,018,864

                12,957        City National  . . . . . . . . . . .      442,967

                31,190        Crestar Financial  . . . . . . . . .    2,054,641

                31,700        Dime Bancorp . . . . . . . . . . . .      754,856

                26,374        Edwards (A.G.) . . . . . . . . . . .      911,551

                15,700        FINOVA Group . . . . . . . . . . . .      765,375

                52,182        First Security . . . . . . . . . . .    1,066,470

                35,544        First Tennessee National . . . . . .    1,126,301

                14,409        First Virginia Banks . . . . . . . .      657,411

                40,500        Firstar  . . . . . . . . . . . . . .    2,298,375

                26,800  (a)   Greenpoint Financial . . . . . . . .      879,375

                43,300        Hibernia, Cl. A  . . . . . . . . . .      722,569

                 8,044        HSB Group  . . . . . . . . . . . . .      324,777

                29,491        Marshall & Iisley  . . . . . . . . .    1,437,686

                19,951        Mercantile Bankshares  . . . . . . .      650,901

                39,800        North Fork Bancorp . . . . . . . . .      791,025

                29,605        Old Kent Financial . . . . . . . . .    1,245,260

                38,050        Old Republic International . . . . .      722,950

                22,370        Pacific Century Financial  . . . . .      455,789

                39,150        Paine Webber Group . . . . . . . . .    1,309,078

                 8,700        PMI Group  . . . . . . . . . . . . .      438,806


                              Interest Sensitive (continued)

                33,200        T. Rowe Price Associates . . . . . . $  1,180,675

                17,500  (a)   Protective Life  . . . . . . . . . .      648,594

                12,200        Provident Financial Group  . . . . .      470,081

                25,400        ReliaStar Financial  . . . . . . . .    1,112,838

                45,742        SouthTrust . . . . . . . . . . . . .    1,669,583

                40,100        Sovereign Bancorp  . . . . . . . . .      526,313

                24,800        TCF Financial  . . . . . . . . . . .      584,350

                 9,300        Wilmington Trust . . . . . . . . . .      512,081

                20,900        Zions Bancorp  . . . . . . . . . . .    1,109,006

                                                                    ___________

                                                                     33,656,913
                                                                    ___________


                             Mining and Metals--.6%

               16,500        AK Steel Holding . . . . . . . . . . .     285,656

                6,344        Carpenter Technology . . . . . . . . .     222,437

                3,168        Cleveland-Cliffs . . . . . . . . . . .     125,730

                6,300        Inland Steel Industries  . . . . . . .     114,975

                1,900  (a)   MAXXAM . . . . . . . . . . . . . . . .     100,581

               12,900        Martin Marietta Materials  . . . . . .     632,906

                7,168        Oregon Steel Mills . . . . . . . . . .      87,808

                                                                    ___________

                                                                      1,570,093
                                                                    ___________


                              Transportation--1.6%

                13,938        Airborne Freight . . . . . . . . . .     326,672

                 7,287  (a)   Alaska Air Group . . . . . . . . . .     261,877

                12,457        Alexander & Baldwin  . . . . . . . .     253,033

                 7,200        Arnold Industries  . . . . . . . . .      91,800

                 8,280        ASA Holdings . . . . . . . . . . . .     297,045

                13,300        CNF Transportation . . . . . . . . .     402,325

                13,646        GATX . . . . . . . . . . . . . . . .     470,787

                 9,900        Hunt (J.B.) Transport  . . . . . . .     165,825

                30,388        Kansas City Southern Industries  . .    1,173,737

                 9,800        Newport News Shipbuilding  . . . . .      257,863

                10,270        Overseas Shipholding Group . . . . .      181,009

                14,200  (a)   Wisconsin Central Transportation . .      214,775

                                                                    ___________

                                                                      4,096,748
                                                                    ___________


                              Utilities--9.8%

                 9,868        Aliant Communications  . . . . . . .      278,463

                34,022        Allegheny Energy . . . . . . . . . .    1,046,177

                 5,992        Black Hills  . . . . . . . . . . . .      154,669

                16,700  (a)   Calenergy  . . . . . . . . . . . . .      457,163

                25,487        Century Telephone Enterprises  . . .    1,447,980

                10,600        Cincinnati Bell  . . . . . . . . . .      274,938

                 6,220        Cleco  . . . . . . . . . . . . . . .      210,314

                 9,015        CMP Group  . . . . . . . . . . . . .      166,214

                28,145        CMS Energy . . . . . . . . . . . . .    1,240,139

                14,536        Comsat . . . . . . . . . . . . . . .      573,264

DREYFUS STATEMENT OF INVESTMENTS (CONTINUED) OCTOBER 31, 1998

     Shares                   COMMON STOCKS (CONTINUED)               Value

________________                                                   ____________


                              Utilities (continued)

                29,799        Conectiv . . . . . . . . . . . . . .   $  681,652

                17,688        Energy East  . . . . . . . . . . . .      864,501

                26,916        Florida Progress . . . . . . . . . .    1,128,790

                 8,929        Hawaiian Electric Industries . . . .      353,812

                10,483        Idacorp  . . . . . . . . . . . . . .      327,594

                19,876        Illinova . . . . . . . . . . . . . .      503,111

                21,279        Interstate Energy  . . . . . . . . .      658,319

                12,451        IPALCO Enterprises . . . . . . . . .      571,190

                17,180        Kansas City Power & Light  . . . . .      494,999

                26,233        MidAmerican Energy Holdings  . . . .      682,058

                 9,437        Minnesota Power & Light  . . . . . .      395,764

                15,315        Montana Power  . . . . . . . . . . .      663,331

                14,211        Nevada Power . . . . . . . . . . . .      358,828

                31,028        New Century Energies . . . . . . . .    1,499,040

                17,416        New England Electric System  . . . .      708,614

                33,396        NIPSCO Industries  . . . . . . . . .      999,793

                36,260  (a)   Northeast Utilities  . . . . . . . .      566,563

                22,446        OGE Energy . . . . . . . . . . . . .      596,222

                23,536        Pinnacle West Capital  . . . . . . .    1,031,171

                32,883        Potomac Electric Power . . . . . . .      861,124

                11,594        Public Service of New Mexico . . . .      255,793

                23,490        Puget Sound Power & Light  . . . . .      634,230

                29,364        SCANA  . . . . . . . . . . . . . . .      992,870

                36,618        TECO Energy  . . . . . . . . . . . .    1,011,572

                17,000        Telephone & Data Systems . . . . . .      677,875

                              Utilities (continued)

                10,257  (a)   Vanguard Cellular Systems  . . . . .      235,911

                31,387        Wisconsin Energy . . . . . . . . . .      961,227

                                                                    ___________

                                                                     24,565,275
                                                                    ___________

                              TOTAL COMMON STOCKS

                                 (cost $203,680,013)  . . . . . .  $228,076,446
                                                                  =============


 Principal        SHORT-TERM
 Amount             INVESTMENTS--8.5%

 ___________

                  U.S. Government Agency--7.9%

$19,940,000       Federal Home Loan Bank,

                        5.40%, 11/2/1998 . . . . . . . . . . . .  $  19,937,009
                                                                  _____________

                  U.S. Treasury Bills--.6%

    246,000  (b)        4.84%, 11/27/98  . . . . . . . . . . . . .      245,414

    426,000  (b)        4.45%, 12/17/98  . . . . . . . . . . . . .      423,917

    100,000  (b)        4.53%, 12/24/98  . . . . . . . . . . . . .       99,407

    142,000  (b)        4.14%, 12/31/98  . . . . . . . . . . . . .      141,046

    350,000  (b)        3.72%, 1/7/99  . . . . . . . . . . . . . .      347,354

    300,000  (b)        3.95%, 1/14/99 . . . . . . . . . . . . . .      297,462
                                                                    ___________

                                                                      1,554,600
                                                                    ___________

TOTAL SHORT-TERM INVESTMENTS
  (cost $21,491,219). . . . . . . . . . . . . . . . . . .         $  21,491,609
                                                                   =============

TOTAL INVESTMENTS
  (cost $225,171,232). . . . . . . . . . . . .      99.1%         $ 249,568,055
                                                    ======        =============

CASH AND RECEIVABLES (NET) . . . . . . . . . . . . .   9%         $   2,203,510
                                                    =======       =============

NET ASSETS . . . . . . . . . . . . . . . . . . . . . 100.0%       $ 251,771,565
                                                    =======       =============

NOTES TO STATEMENT OF INVESTMENTS:
- -------------------------------------------------------------------------------

(a) Non-income producing.
(b) Held by the custodian in a segregated account as collateral for open
    financial futures positions.


<TABLE>
<CAPTION>
STATEMENT  OF FINANCIAL FUTURES
OCTOBER 31, 1998

Financial Futures Purchased
- ----------------------

                                                                               Market Value                           Unrealized
                                                                                 Covered                             Appreciation
                                                               Contracts       by Contracts         Expiration        at 10/31/98
                                                               ________        ____________        ____________       ___________
<S>                                                               <C>           <C>                <C>                 <C>
Standard & Poor's MidCap 400 . . . . . . . . . . . . . . .        141           $23,716,200        December '98        $1,884,700
                                                                                                                       ==========


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>

DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

STATEMENT OF ASSETS AND LIABILITIES                          OCTOBER 31, 1998

                                                                                                    Cost               Value
                                                                                                _____________     _____________
<S>                              <C>                                                             <C>               <C>
ASSETS:                          Investments in securities--See Statement of Investments . .     $225,171,232      $249,568,055

                                 Cash  . . . . . . . . . . . . . . . . . . . . . . . . . .                              238,156

                                 Receivable for investment securities sold . . . . . . . .                            1,585,469

                                 Receivable for futures variation margin--Note 4(a)  . . .                              432,200

                                 Receivable for shares of Common Stock subscribed  . . . .                              303,200

                                 Dividends and interest receivable . . . . . . . . . . . .                              231,433
                                                                                                                   ____________

                                                                                                                    252,358,513
                                                                                                                   ____________


LIABILITIES:                     Due to The Dreyfus Corporation and affiliates . . . . . .                               48,720

                                 Due to Distributor  . . . . . . . . . . . . . . . . . . .                               48,720

                                 Payable for shares of Common Stock redeemed . . . . . . .                              489,508
                                                                                                                   ____________

                                                                                                                        586,948
                                                                                                                   ____________


NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                         $251,771,565
                                                                                                                   ============


REPRESENTED BY:                  Paid-in capital . . . . . . . . . . . . . . . . . . . . .                         $172,223,830

                                 Accumulated undistributed investment income--net  . . . .                            2,289,671

                                 Accumulated net realized gain (loss) on investments . . .                           50,976,541

                                 Accumulated net unrealized appreciation (depreciation)
                                   on investments (including $1,884,700 net unrealized
                                   appreciation on financial futures)--Note 4(b) . . . . .                           26,281,523
                                                                                                                   ____________


 NET ASSETS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                         $251,771,565
                                                                                                                   ============


SHARES OUTSTANDING

(200 MILLION SHARES OF $.001 PAR VALUE COMMON STOCK AUTHORIZED). . . . . . . . . . . . . .                            9,760,163


NET ASSET VALUE, offering and redemption price per share--Note 3(c). . . . . . . . . . . .                               $25.80
                                                                                                                         ======

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>


DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

STATEMENT OF OPERATIONS                           YEAR ENDED OCTOBER 31, 1998

INVESTMENT INCOME
<S>                                                                                         <C>                   <C>
INCOME:                          Cash dividends  . . . . . . . . . . . . . . . . .          $ 3,133,874

                                 Interest    . . . . . . . . . . . . . . . . . . .              905,444

                                                                                           ____________


                                    Total Income . . . . . . . . . . . . . . . . .                                $ 4,039,318


EXPENSES:                        Management fee--Note 3(a) . . . . . . . . . . . .              683,079

                                 Shareholder servicing costs--Note 3(b)  . . . . .              683,079

                                 Interest expense--Note 2  . . . . . . . . . . . .                1,239

                                 Loan commitment fees--Note 2  . . . . . . . . . .                  205

                                                                                           ____________

                                    Total Expenses . . . . . . . . . . . . . . . .                                  1,367,602

                                                                                                                 ____________

INVESTMENT INCOME--NET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                  2,671,716

                                                                                                                 ____________

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

                                 Net realized gain (loss) on investments . . . . .          $54,266,513

                                 Net realized gain (loss) on financial futures . .           (2,358,928)

                                                                                           ____________

                                    Net Realized Gain (Loss) . . . . . . . . . . .                                 51,907,585

                                 Net unrealized appreciation (depreciation) on

                                    investments (including $1,822,400 net unrealized

                                    appreciation on financial futures) . . . . . .                               (38,375,039)

                                                                                                                 ____________



NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS . . . . . . . . . . . . . .                                 13,532,546

                                                                                                                 ____________

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS . . . . . . . . . . . . . . .                                $16,204,262

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

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>
DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

STATEMENT OF CHANGES IN NET ASSETS


                                                                                             Year Ended           Year Ended
                                                                                          October 31, 1998     October 31, 1997
                                                                                          _______________      _______________

OPERATIONS:
<S>                                                                                         <C>                  <C>
   Investment income--net  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        $    2,671,716       $    2,140,753

   Net realized gain (loss) on investments . . . . . . . . . . . . . . . . . . . . .            51,907,585           17,095,238

   Net unrealized appreciation (depreciation) on investments . . . . . . . . . . . .           (38,375,039)          36,244,257

                                                                                           _______________       ______________

       Net Increase (Decrease) in Net Assets Resulting from Operations . . . . . . .            16,204,262           55,480,248

                                                                                           _______________       ______________


DIVIDENDS TO SHAREHOLDERS FROM:

   Investment income--net  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            (2,039,372)          (2,236,912)

   Net realized gain on investments  . . . . . . . . . . . . . . . . . . . . . . . .           (17,600,666)          (8,243,435)

                                                                                           _______________       ______________

       Total Dividends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           (19,640,038)         (10,480,347)

                                                                                           _______________       ______________


CAPITAL STOCK TRANSACTIONS:

   Net proceeds from shares sold . . . . . . . . . . . . . . . . . . . . . . . . . .           196,809,454           76,561,680

   Dividends reinvested  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            16,175,235            9,015,232

   Cost of shares redeemed . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          (179,206,556)         (80,546,553)

   Redemption fee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               412,437             --

                                                                                           _______________       ______________

       Increase (Decrease) in Net Assets from Capital Stock Transactions . . . . . .            34,190,570            5,030,359

                                                                                           _______________       ______________

          Total Increase (Decrease) in Net Assets  . . . . . . . . . . . . . . . . .            30,754,794           50,030,260


NET ASSETS:

   Beginning of Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           221,016,771          170,986,511

                                                                                           _______________       ______________

   End of Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        $  251,771,565       $  221,016,771

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



UNDISTRIBUTED INVESTMENT INCOME--NET . . . . . . . . . . . . . . . . . . . . . . . .       $     2,289,671       $    1,657,327

                                                                                           _______________       ______________


                                                                                               Shares                Shares

                                                                                           _______________       ______________

CAPITAL SHARE TRANSACTIONS:

   Shares sold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             7,389,574            3,242,152

   Shares issued for dividends reinvested  . . . . . . . . . . . . . . . . . . . . .               654,969              428,888

   Shares redeemed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            (6,607,784)          (3,366,259)

                                                                                           _______________       ______________

       Net Increase (Decrease) in Shares Outstanding . . . . . . . . . . . . . . . .             1,436,759              304,781

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

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

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 statement.
<TABLE>
<CAPTION>



                                               Year Ended October 31,


                                                                   ____________________________________________________________

PER SHARE DATA:                                                      1998         1997        1996         1995        1994
                                                                    ______       ______      _______      _______     _______
<S>                                                                 <C>          <C>          <C>          <C>         <C>
   Net asset value, beginning of period  . . . . . . . . . .        $26.55       $21.32       $19.40       $17.14      $17.63
                                                                    ______       ______      _______      _______     _______

   Investment Operations:

   Investment income--net  . . . . . . . . . . . . . . . . .           .27          .25          .28          .29         .26

   Net realized and unrealized gain (loss) on investments  .          1.16         6.25         2.81         3.00         .08

                                                                    ______       ______      _______      _______     _______

   Total from Investment Operations  . . . . . . . . . . . .          1.43         6.50         3.09         3.29         .34

                                                                    ______       ______      _______      _______     _______

   Distributions:

   Dividends from investment income--net . . . . . . . . . .          (.23)        (.27)        (.30)        (.28)       (.27)

   Dividends from net realized gain on investments . . . . .         (1.99)       (1.00)        (.87)        (.75)       (.56)

                                                                    ______       ______      _______      _______     _______

   Total Distributions . . . . . . . . . . . . . . . . . . .         (2.22)       (1.27)       (1.17)       (1.03)       (.83)

                                                                    ______       ______      _______      _______     _______

   Redemption fee added to paid-in capital . . . . . . . . .           .04           --           --           --          --

                                                                    ______       ______      _______      _______     _______

   Net asset value, end of period  . . . . . . . . . . . . .        $25.80       $26.55       $21.32       $19.40      $17.14

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


TOTAL INVESTMENT RETURN. . . . . . . . . . . . . . . . . . .          5.88%       32.02%       16.65%       20.78%       1.89%

RATIOS/SUPPLEMENTAL DATA:

   Ratio of expenses to average net assets . . . . . . . . .           .50%         .50%         .50%         .50%        .40%

   Ratio of net investment income to average
       net assets  . . . . . . . . . . . . . . . . . . . . .           .98%        1.07%        1.49%        1.80%       1.68%

   Decrease reflected in above expense ratios due to
       undertakings by the Manager . . . . . . . . . . . . .            --          .09%         .17%         .35%        .43%

   Portfolio Turnover Rate . . . . . . . . . . . . . . . . .         67.85%       20.15%       14.66%       20.46%      19.81%

   Net Assets, end of period (000's Omitted) . . . . . . . .      $251,772     $221,017     $170,987     $122,982     $75,404

                      SEE NOTES TO FINANCIAL STATEMENTS.

</TABLE>

DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS

NOTE 1--SIGNIFICANT ACCOUNTING POLICIES:

  Dreyfus  MidCap  Index  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
investment  results  that  correspond  to  the  price  and  yield performance of
publicly-traded   common   stocks  of  medium-size  domestic  companies  in  the
aggregate, as represented by the Standard & Poor's MidCap 400 Index. The Dreyfus
Corporation  (" Dreyfus" ) serves  as the Fund's investment adviser. Boston Safe
Deposit  and  Trust  Company,  an affiliate of Dreyfus, is the Fund's custodian.
Dreyfus  is  a  direct  subsidiary  of  Mellon  Bank,  N.A.  Premier Mutual Fund
Services,  Inc.  (the  "Distributor" ) is  the distributor of the Fund's shares,
which are sold to the public without a sales charge.

  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 (including options and
financial futures) are valued at the last sales price on the securities exchange
on  which such securities are primarily traded or at the last sales price on the
national securities market. Securities not listed on an exchange or the national
securities  market,  or  securities  for  which  there were no transactions, are
valued  at  the  average of the most recent bid and asked prices. Securities for
which  there  are  no  such valuations are valued at fair value as determined in
good faith under the direction of the Board of Directors. Bid price is used when
no  asked  price is available. Investments denominated in foreign currencies are
translated to U.S. dollars at the prevailing rates of exchange.

(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. Dividend income is
recognized  on  the  ex-dividend  date  and  interest  income,  including, where
applicable,  amortization  of  discount  on  investments,  is  recognized on the
accrual    basis.

(C) DIVIDENDS TO SHAREHOLDERS: Dividends are recorded on the ex-dividend date.
Dividends  from  investment  income-net  and dividends from net realized capital
gain are normally declared and paid annually. 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, if any, 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.

DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

NOTE 2--BANK LINE OF CREDIT:

  The  Fund  participates  with  other  Dreyfus-managed  funds in a $600 million
redemption  credit  facility  (" Facility" ) to  be  utilized  for  temporary or
emergency  purposes,  including  the  financing  of  redemptions.  In connection
therewith, the Fund has agreed to pay commitment fees on its pro rata portion of
the  Facility.  Interest  is  charged  to  the Fund at rates based on prevailing
market    rates    in    effect    at    the    time    of    borrowings.

  The  average  daily  amount  of borrowings outstanding during the period ended
October  31,  1998  was  approximately  $20,500, with a related weighted average
annualized interest rate of 6.03%.

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

  (A)  Pursuant  to  a  management  agreement  (" Agreement" ) with Dreyfus, the
management  fee  is computed at the annual rate of .25 of 1% of the value of the
Fund' s average daily net assets, and is payable monthly. Under the terms of the
Agreement,  Dreyfus  has  agreed  to  pay  all  of  the  Fund's expenses, except
management  fees,  brokerage commissions, taxes, commitment fees, interest, fees
and  expenses  of non-interested Directors (including counsel fees), Shareholder
Services  Plan fees and extraordinary expenses. In addition, Dreyfus is required
to reduce its fee in an amount equal to the Fund's allocable portion of the fees
and  expenses  of  non-interested  Directors  (including counsel). Each director
receives  an  annual fee of $2,500 and an attendance fee of $500 per meeting and
is  reimbursed  for travel and out-of-pocket expenses. The Chairman of the Board
receives  an additional 25% of such compensation. Amounts required to be paid by
the  Fund  directly  to  the  non-interested Directors, that would be applied to
offset  a  portion  of  the  management fee payable to Dreyfus, are in fact paid
directly by Dreyfus to the non-interested Directors.

(B) Under the Shareholder Services Plan, the Fund pays the Distributor for the
provision  of  certain  services at the annual rate of .25 of 1% of the value of
the  Fund's average daily net assets. 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. The Distributor may
make  payments  to Service Agents (a securities dealer, financial institution or
other  industry  professional)  in  respect  of  these services. The Distributor
determines  the  amounts  to  be paid to Service Agents. During the period ended
October  31,  1998,  the  Fund  was charged $683,079 pursuant to the Shareholder
Services Plan.

  (C)  A  1%  redemption  fee  is  charged  and  retained by the Fund on certain
redemptions  of  Fund  shares  (including  redemptions  through  use of the Fund
Exchanges  service)  where  the redemption or exchange occurs within a six month
period following the date of issuance.

DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

NOTE 4-- SECURITIES TRANSACTIONS:

  (A)  The  aggregate  amount  of  purchases and sales of investment securities,
excluding  short-term  securities and financial futures, during the period ended
October 31, 1998 amounted to $171,438,250 and $172,559,546, respectively.

  The  Fund  may invest in financial futures contracts in order to gain exposure
to  or protect against changes in the market. The Fund is exposed to market risk
as  a  result  of  changes in the value of the underlying financial instruments.
Investments in financial futures require the Fund to "mark to market" on a daily
basis,  which  reflects  the  change  in the market value of the contract at the
close of each day's trading. Accordingly, variation margin payments are received
or  made  to  reflect  daily  unrealized gains or losses. When the contracts are
closed,  the  Fund recognizes a realized gain or loss. These investments require
initial  margin  deposits  with  a  custodian,  which  consist  of  cash or cash
equivalents, up to approximately 10% of the contract amount. The amount of these
deposits  is  determined by the exchange or Board of Trade on which the contract
is  traded  and is subject to change. Contracts open at October 31, 1998 are set
forth in the Statement of Financial Futures.

  (B)   At   October  31,  1998,  accumulated  net  unrealized  appreciation  on
investments  and  financial  futures was $26,281,523, consisting of  $43,318,098
gross unrealized appreciation and $17,036,575 gross unrealized depreciation.

  At  October  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).

DREYFUS MIDCAP INDEX FUND
- -----------------------------------------------------------------------------

REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

SHAREHOLDERS AND BOARD OF DIRECTORS

DREYFUS MIDCAP INDEX FUND

  We  have  audited  the  accompanying  statement  of  assets and liabilities of
Dreyfus  MidCap Index Fund including the statements of investments and financial
futures, as of October 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 verification by
examination  of  securities  held  by  the  custodian as of October 31, 1998 and
confirmation  of  securities  not  held  by the custodian by correspondence with
others.  An  audit  also  includes  assessing the accounting principles used and
significant  estimates  made  by  management,  as well as evaluating the overall
financial   statement  presentation.  We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

  In  our opinion, the financial statements and financial highlights referred to
above  present  fairly,  in  all  material  respects,  the financial position of
Dreyfus MidCap Index Fund at October 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

December 4, 1998



Dreyfus lion "d" logo                                   (reg.tm)

Dreyfus logo                                   (reg.tm)

DREYFUS MIDCAP INDEX FUND

200 Park Avenue

New York, NY 10166

MANAGER

The Dreyfus Corporation

200 Park Avenue

New York, NY 10166

CUSTODIAN

Boston Safe Deposit and Trust Company

One Boston Place

Boston, MA 02109

TRANSFER AGENT &

DIVIDEND DISBURSING AGENT

Dreyfus Transfer, Inc.

P.O. Box 9671

Providence, RI 02904









Printed in U.S.A.                                             113AR9810

MidCap Index

Fund

Annual Report

October 31, 1998



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