PERIODICAL APPEARANCE OF KORSCHELTELLUS-GRACILIS (LEPIDOPTERA, HEPIALIDAE)

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 sug gest that the odd- and even-year broods from Camels Hump Mountain, Ver mont, may be the same population, with little genetic differentiation. Distribution maps of field collections and museum records show period ical abundance at the vast majority of localities, thus refuting hypot heses of recent colonization and natural abiotic catastrophe. Availabl e evidence for competition, parasitism, and pathogens as agents of per iodical abundance in K. gracilis is discussed.