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North American Ecology (US and Canada)Chlosyne pallais resident to the northwestern United States and southwestern Canada, with an isolated population in northern Alberta (Scott 1986). Habitats are coastal chaparral and open woodland, and transition to Canadian zone moist wooded areas and clearings. Host plants are herbs and shrubs, with known hosts restricted to one family, Compositae. Eggs are laid on the host plant in clusters. Individuals overwinter as half grown larvae. There are is one flight each year with approximate flight time late Apr. ? June 15 in the southern part of their range, and June15-July 15 in high altitude, northern and inland parts of the range (Scott 1986).