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North American Ecology (US and Canada)Hesperia uncas is a year-round resident in the central western United States, north into south central Canada and south to southern Mexico (Scott 1986). Habitats are prairie, open woodland and sagebush. Host plants are several species of grasses, especially Bouteloua gracilis. Eggs are laid on or near the host plant singly. There is a variable number of flights depending on latitude with one flight at high altitude with the approximate flight time June 150 July 31, two flights, mainly June 1-June 30 and Aug.1-Aug.31 on the plains, and several flights from late April- Sept. 15 in the southern part of their range (Scott 1986).