Abstract
The presence or absence of certain esterase types in ejaculatory bulbs of 93 Drosophilaspecies was determined by appropriate staining after starch gel electrophoresis. One entire subgenus (Sophophora)and several primitive species were found lacking in one type of esterase. This esterase was present in numerous species of the large Drosophilasubgenus, but presence and absence did not follow closely the lines of taxonomic subdivisions in the subgenus. Correlation of presence-absence of the bulb esterase and previous results in interspecific hybridization tests indicated a greater chance for a successful interspecific cross when males possessed the bulb esterase.
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