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North American Ecology (US and Canada)Callophyrus mossii is resident in northwestern North America, with several small isolated populations further east and south (Scott 1986). Habitats are transition to lower Canadian zone wooded canyons, in Ca. rocky areas and cliffs in open woodland. Host plants limited to several species within one family, succulent Crassulaceae. Eggs are laid on the host plant singly. Individuals overwinter as pupae. There is one flight each year with the approximate flight time Mar15-May30 (Scott 1986).