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North American Ecology (US and Canada)Native through the western and northern United States and up into northern Canada and Alaska in North America (Scott 1986). Habitats are mountains and woods. Host plants are herbaceous, largely restricted to one genus, Urtica (Urticaceae). Eggs are laid on the host plant in clusters usually of several hundred eggs per clutch (as many as 713 have been recorded). Individuals overwinter as adults. There are variable numbers of flights each year depending on latitude; in the far northern part of the range there is one flight in late July, further south there are two flights late June-early Aug. and late August (Scott 1986).