DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
NSAR-A, 1998-05-29
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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> 2
     <NAME>   INVESTOR
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1998
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<INVESTMENTS-AT-VALUE>                          124905
<RECEIVABLES>                                     1850
<ASSETS-OTHER>                                     126
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<TOTAL-ASSETS>                                  126881
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        130106
<SHARES-COMMON-STOCK>                            12431
<SHARES-COMMON-PRIOR>                            17716
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (3133)
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<NUMBER-OF-SHARES-SOLD>                           9550
<NUMBER-OF-SHARES-REDEEMED>                    (15253)
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<PER-SHARE-NAV-BEGIN>                             1.99
<PER-SHARE-NII>                                   .060
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<PER-SHARE-NAV-END>                               1.99
<EXPENSE-RATIO>                                   .005
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<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000912492
<NAME> DREYFUS INSTITUTIONAL SHORT TERM TREASURY FUND
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     <NUMBER> 1
     <NAME>   INSTITUTIONAL
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1998
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<INVESTMENTS-AT-VALUE>                          124905
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<PAYABLE-FOR-SECURITIES>                             0
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<SHARES-COMMON-STOCK>                            51571
<SHARES-COMMON-PRIOR>                            59670
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<ACCUMULATED-NET-GAINS>                         (3133)
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<NET-ASSETS>                                    101988
<DIVIDEND-INCOME>                                    0
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<OTHER-INCOME>                                       0
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<NUMBER-OF-SHARES-REDEEMED>                    (18350)
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<PER-SHARE-NAV-BEGIN>                             1.98
<PER-SHARE-NII>                                   .060
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<PER-SHARE-DIVIDEND>                            (.060)
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<PER-SHARE-NAV-END>                               1.98
<EXPENSE-RATIO>                                   .002
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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