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North American Ecology (US and Canada)Satyrium acadica is resident throughout the northeastern United States, into southern Canada (Scott 1986). Habitats are along streams with willows. Host plants are tree-shrubs restricted to one genus Salix (Salicaceae). Eggs are laid on twigs of the host plant. Larvae are associated with ants. Individuals overwinter as eggs. There is one flight each year with the approximate flight time late June- early Aug (Scott 1986).