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North American Ecology (US and Canada)Resident in western North America (Scott 1986). Habitats are CONIFEROUS FOREST. Host plants are usually trees with known hosts largely restricted to a few species in one family, PINACEAE. Eggs are laid on the host plant in rows of 3-22 eggs. Individuals overwinter as eggs. There is one flight each year with the approximate flight time JUL15-SEP15 depending on latitude (Scott 1986).