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Alberta
Butterfly.--This, the least attractive in appearance of the species composing the genus, has pale wings with a "washed-out" appearance on the upper side, almost all the dark markings being greatly reduced or obliterated. On the under side the wings are even more obscurely marked than on the upper side. The female is darker than the male, and specimens have a greasy look. Expanse, male, 1.55 inch; female, 1.65-1.75 inch.
Early Stages.--Unknown, except the egg and the young caterpillar, which have been most beautifully figured by Edwards in vol. iii of "The Butterflies of North America." The only locality from which specimens have as yet been received by collectors is Laggan, in Alberta, where the species apparently is not uncommon at lofty elevations above sea-level.