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North American Ecology (US and Canada)Resident in western North America (Scott 1986). Habitats are DESERT, CHAPARRAL, SAGEBRUSH, OPEN WOODLAND. Host plants are usually herbaceous with known including many species, but mostly 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 APR1-MAY30 in most areas, MAR15-MAY1 in the southern part of their range, and JUNE in mountain areas (Scott 1986).