1983] 
Shapiro — Species recognition 
65 
hybridization which outweighs the discrimination against bandless 
females, and no such disadvantage has been found. Bandlessness 
may be quite incidental to hybridization, but that still leaves the 
question of why it persists. 
Acknowledgements 
This research was supported by the Department of Zoology, UC 
Davis, to which 1 express my thanks. This paper is dedicated to the 
memory of Robert E. Silberglied, who would no doubt have had 
great fun with shock phenotypes in behavioral studies. 
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