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Upperside of both male and female is white, with black spots near tip of forewing. Inside the forewing cell is a square black bar with a curved white center. The underside of the hindwing of both sexes has wide green edging along the veins, confined by a white median band. Wing Span: 1 5/8 - 2 inches (4 - 5 cm).
Spotted in a meadow near the Umtanum creek. Cascade foothills above 2000 ft. Habitat: Arid brushlands, desert foothills and canyons, fields. Range: British Columbia and Alberta south to Baja California; east of the Cascades and Sierra Nevada, east and south to western Montana and New Mexico.
Adult Food: Flower nectar including hedge mustard and alfalfa.