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North American Ecology (US and Canada)Resident in western North America (Scott 1986): southern Oregon, much of California and northern Baja peninsula. Habitats are OPEN WOODLAND CANYONS. Host plants are usually herbaceous with most known hosts largely restricted to a few species in one family, Cruciferae. Eggs are laid on the host plant singly. Individuals overwinter as pupae. There is one flight each year with the approximate flight time MAR1-MAY31 depending on latitude (Scott 1986).