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North American Ecology (US and Canada)Callophrys spinetorum is resident to much of western North America from British Colombia south to Baja and Mexico (Scott 1986). Habitats are upper Sonoran to lower Hudsonian zone coniferous forest. Host plants are several species of mistletoe restricted to the genus Arceuthobium (Viscaceae), which are parasitic on Pinaceae trees. Eggs are laid on the host plant singly. Individuals overwinter as pupae. There is a variable number of flights based on latitude, in the northern part of the range there is one flight, mostly June1-Jun30, and in the southern part of their range there are several flights Mar1-Aug31, mostly May and July (Scott 1986).