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Santa Barbara Field Guides – Butterflies Lepidoptera Lycaenidae Satyrium sylvinus Sylvan Hairstreak |
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Size:
wingspread 1-1.4 in. Recognition: Gray to brownish gray, occasionally with bluish tones; orange coloring on bottom of HW; may or may not have tail; very similar to Satyrium californica, but underside has less orange and fewer spots.. Flight period: The adults are active from May to August. Hostplants: The larvae feed on willows (Salix). Habitat: They prefer riparian settings in foothills and canyons, also willow woodland. Distribution: Much of western U.S., including California, and south into Baja California. 
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