Size: 1.25 - 1.5 inches wingspan
Key ID features: Above both sexes brown. Below chocolate brown. Long tails on HW. White median line containing flattened "W" near white-tipped tails, and submarginal row of black spots (sometimes vague) along half of trailing margin of HW.
Similar species: Thicket HS has more prominent "W" in white median line, is blue above, and submarginal spots on HW below run entire length of trailing margin.
Host plant: Dwarf mistletoes that grow on Western Hemlock and Grand fir (in the Cascade Range) and on Ponderosa Pine (in the Blue Mountains).
Habitat: Clearings in old growth coniferous forest (Ponderosa pine, Douglas-fir, western hemlock, grand fir).
Range: Cascade Range, Siskiyou Mtns, and in the Blue Mtns in Baker and Union counties.
Season: Mid-May to early September
Conservation Status: Oregon State Species of Concern