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North American Ecology (US and Canada)Oeneis navadensis is resident to Washington, Oregon, northern California and Vancouver Island (Scott 1986). Habitats are forest glades and rocky hills. Host plants are unknown (larvae eat grass in the lab). This species is biennial; individuals overwinter as second or third instar larvae the first winter, and as fifth instar larvae the second winter. There is one flight each year (mostly even years) with the approximate flight time late May ? July 15 (Scott 1986).