AdultThe Western Pine Elfin is slightly larger than other elfin species. The pattern of the ventral hindwing is very distinctive. The submarginal area is a row of connected black chevrons accented by a contiguous lateral row of tawny chevrons.
Immature StagesHardy (1959a) described the BC immatures. The egg is 0.75 mm x 0.50 mm, and thus not as flat as the egg of Moss' Elfin. The mature larva has a brown head and rich velvet green body with two cream white stripes on each side. The body is overlaid with fine brown hairs.
SubspeciesMost BC populations are the nominate subspecies, I.e. eryphon (Boisduval, 1852); TL: Hwy. 70 at Soda Creek, Plumas Co., CA (Emmel et al. 1998a). Vancouver Island and Lower Fraser Valley populations are I.e. sheltonensis Chermock & Frechin, 1948 (TL: Shelton [near Olympia], WA)