234 THE BUTTERFLIES OF THE WEST COAST 



that time I had never known Isophthalma. This species has not 

 the white space in the fringe of fore wing just above inner angle, 

 and can be separated from Exilis in that way. 



Considering that Isophthalma is a semi-tropical, low-land 

 species, it is probable that upon fuller examination and compari- 

 son of a series this Californian alpine form will prove to be a 

 separate species. 



Genus PHOLISORA. 



404. Pholisora Catullus. Erroneously numbered 403 on the 

 plate. 



Plate XXX ; Figures 404, a. 

 Fig. 404, Male, Southern California, no data; Author. 



a. Male, underside, Greenhorn Mountains, June, 



1888; Author. 

 This is a common butterfly all over the United States, but I 

 have not met it in the more northern parts of the West Coast. It 

 flies on the plains and to 8,000 feet elevation on the mounttins, 

 this figure a was taken at 7,000 feet. 



406. Pholisora Libya. 



Plate XXX ; Figures 406, b, c. 



Fig. 406, Male, Fish Spring, Mojave Desert, April 8, 1889 ; 

 Author. 



b. Female, Colorado Desert, Lone Palm, May 2, 



1889 ; Author. 



c. Female, underside, Colorado Desert, Lone Palm, 



May 3, 1889 ; Author. 

 Libya is a true desert butterfly. In general the deserts are not 

 adapted to butterfly life, and but few are ever seen in a real desert, 

 although several species are found around the borders of the dry 

 and sandy wastes, but Libya is an exception, and is oftenest found 

 in the thoroughly desert locations, and seldom found in any less 

 rigorous locality. I observed the females ovipositing on the leaves 

 of Atriplex canescens, a small desert shrub, in the Colorado desert, 

 May 2, 1889. Libya is reported to be found in some parts of Utah, 

 and presumably may be seen in the intervening regions of Nevada. 



