GENUS COLIAS 123 



the statement might have more force, but so far as I know the two 

 species inhabit quite different locaUties, neither intruding upon the 

 territory of the other, the Cascade Range of mountains forming 

 a barrier between the two species. 



Edwardsi is a rare species, and I have never taken very many 

 of them in any place. 



90. Colias Christina. Not elsewhere illustrated in accessible 



form. 

 Plate XI ; Figures 90, b, bb. 

 Fig. 90, Male, Central Montana, July 10, 1890; Author. 



b, Female, Shoshone, Idaho, July 24, 1890; Author, 

 bb, Female, albino, Shoshone, Idaho, July 24, 1890; 

 Author. 

 The Author of this species says of it that, "It is the most vari- 

 able Coliad in America." The deep orange of the male Christina 

 is similar to that of Eurytheme, but the pattern of it is unlike, in 

 that the orange of Christina is deepest at the margin, and evenly 

 grows less deep till near the base there is little or no orange, but 

 only the regular yellow ground-color of the wings. The albino 

 females prevail, and the normal-colored one is extremely rare, 

 being apparently nearly extinct. On the underside the hind wings, 

 especially of the females, are thickly dusted with black scales. 



Christina inhabits British America immediately east of the 

 Rocky Mountains, and comes south into Montana a little, but not 

 far. It may be looked for in the region west of the Rocky Moun- 

 tains and east of the Cascade Range, in Idaho, Oregon and Wash- 

 ington, though I am not aware that any specimens of it have as yet 

 been taken in those regions. 



91. Colias Astrae. Not figured elsewhere except in Butt. 



N. A. 

 Plate XI; Figures 91, b. 



Fig. 91, Male, Central Montana, July, 1890; Author. 

 b. Albino Female, Montana, July, 1890; Author. 

 Astrae is believed to be the paler, southern, form or variety of 

 Christina, but the fact is yet to be proved. It inhabits generally 

 the same territory, but does not go so far north and comes much 

 further south than Christina, even to Northeastern California, but 

 it is quite rare, and not enough is at present known about it or its 

 range to enable me to say positively much about it. I do not know 



