Abstract
Korscheltellus gracilis (Grote) has a 2-yr life cycle, with numbers of emerging adults in odd and even years differing by one to two orders of magnitude. Results from starch-gel electrophoresis of allozymes suggest that the odd- and even-year broods from Camels Hump Mountain, Vermont, may be the same population, with little genetic differentiation. Distribution maps of field collections and museum records show periodical abundance at the vast majority of localities, thus refuting hypotheses of recent colonization and natural abiotic catastrophe. Available evidence for competition, parasitism, and pathogens as agents of periodical abundance in K. gracilis is discussed.
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