The answer to your question can be found in this paper:
MOUNT SM; BURKS C; HERTZ G; STORMO GD; and others.
SPLICING SIGNALS IN DROSOPHILA - INTRON SIZE, INFORMATION CONTENT, AND
NUCLEIC ACIDS RESEARCH, 1992 AUG 25, V20 N16:4255-4262.
>Can anyone give me a consensus sequence for splice sites characteristic
>to Drosophila genes? I have suspected introns in a genomic clone but
>would like to know how likely these are to be real.
Center for Population Biology
University of California
Davis, CA 95616