(2) Euchloë ausonides, Boisduval, Plate XXXII, Fig. 24, ♂; Fig. 25, ♁; Plate XXXIV, Fig. 3, ♂, under side (Ausonides).
Butterfly.—On the under side the fore wings are greenish; the hind wings are marked with three irregular green bands, the outer one forking into six or seven branches toward the outer and inner margins. Expanse, 1.65-1.90 inch.
Early Stages.—The larva and chrysalis are described by Edwards in "The Butterflies of North America," vol. ii. The caterpillar is pale whitish-green, with dark-green longitudinal stripes on the side and back. It feeds on cruciferous plants.
Ausonides ranges from Arizona to Alaska, and eastward to Colorado.
(3) Euchloë creusa, Doubleday and Hewitson, Plate XXXII, Fig. 23, ♂; Plate XXXIV, Fig. 2, ♁, under side (Creusa).
Butterfly.—Similar to the preceding species, but smaller, the white more lustrous on the under side, and the green markings on the under side of the wings heavier. Expanse, 1.20-1.40 inch.
Early Stages.—We know very little of these.
The species is reported from California, Colorado, and Alberta. I possess a singular varietal form or aberration from Arizona, in which the black spot on the upper side of the primaries fills the outer half of the cell.
(4) Euchloë rosa, Edwards, Plate XXXII, Fig. 39, ♂, under side (Rosa).