Abstract
The electrophoretic separation of enzymes and other proteins has become a powerful tool to investigate evolutionary problems. Among insects, Drosophila has been the organism most extensively studied electrophoretically. The present study of electrophoretically detectable genetic variation in butterflies of the genus Speyeria was undertaken to investigate a series of questions of evolutionary interest, specifically the amount of genetic variation in natural populations of 10 different species, the degree of genetic differentiation between local populations and the processes responsible for such differentiation, and the amount of differentiaton between the subspecies and between the species of Speyeria. A tentative phylogeny as well as some taxonomic conclusions are additional outcomes of our study.
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