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North American Ecology (US and Canada)

Resident throughout the US and southern Canada, migratory to the north (Scott 1986). Habitats are OPEN AREAS at all altitudes. Host plants are usually herbaceous including many species, but mostly in one family, LEGUMINOSAE. Eggs are laid on the host plant singly. Individuals overwinter as 3rd or 4th instar larvae. There are multiple flights each year with the approximate flight time FEB1-NOV1 depending on latitude (Scott 1986).


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