(4) Pholisora alpheus, Edwards, Plate XLV, Fig. 2, ♂ (Alpheus).
Butterfly.—This little species is nearer P. hayhursti than any of the others we have described, but may at once be recognized and discriminated by the checkered margins and white tip of the fore wing and the linear shape of the spots composing the submarginal and median bands on the upper side of this wing. The hind wings on the under side are marked with a number of light spots arranged in marginal and median bands.
Early Stages.—Unknown.
Alpheus occurs in Nevada, Arizona, and New Mexico.
There are four other species of the genus found in our fauna.
Genus THANAOS, Boisduval
(The Dusky-wings)
Butterfly.—The antennæ have a moderately large club, curved, bluntly pointed. The palpi are porrect, the third joint almost concealed in the dense hairy vestiture of the second joint. The neuration of the wings is represented in the cut. The fore wing in the case of the male always has a costal fold. The butterflies comprised in this genus are all, without exception, dark in color, in a few species having bright spots upon the hind wings.
The genus reaches its largest development in North America. The discrimination of the various species is somewhat difficult.
