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Santa Barbara Field Guides Butterflies

     Satyrium sylvinus
     Sylvan Hairstreak


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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