DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
NSAR-B, 1997-11-25
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<PAGE>      PAGE  1
000 B000000 09/30/97
000 C000000 0000912492
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001 A000000 DREYFUS INSTITUTIONAL SHORT TERM TREAS FUND
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022 A000001 AUBREY G. LANSTON & CO. INC.
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022 A000002 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
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022 A000003 BARCLAY DE ZOETE WEDD SECURITIES, INC.
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SIGNATURE   MICHAEL S. PETRUCELLI                        
TITLE       V.P & ASST TREASURER
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000912492
<NAME> DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
<SERIES>
   <NUMBER> 001
   <NAME> INSTITUTIONAL SHARES - CLASS A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
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<PERIOD-END>                               SEP-30-1997
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<INVESTMENTS-AT-VALUE>                          149936
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        156802
<SHARES-COMMON-STOCK>                            59670
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<EXPENSE-RATIO>                                   .002
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<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000912492
<NAME> DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
<SERIES>
   <NUMBER> 002
   <NAME> INVESTOR SHARES - CLASS B
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               SEP-30-1997
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<INVESTMENTS-AT-VALUE>                          149936
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<SHARES-COMMON-STOCK>                            17716
<SHARES-COMMON-PRIOR>                            12298
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (3547)
<OVERDISTRIBUTION-GAINS>                             0
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<NET-ASSETS>                                     35296
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<OTHER-INCOME>                                       0
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1066)
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<NUMBER-OF-SHARES-REDEEMED>                    (13223)
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<NET-CHANGE-IN-ASSETS>                         (41382)
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<PER-SHARE-NII>                                    .12
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<PER-SHARE-NAV-END>                               1.99
<EXPENSE-RATIO>                                   .005
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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