Genus Argynnis 



The female is much lighter than the male, and, as usual, the dark 

 lines are heavier than in that sex. The spots of the median band 

 are bent and partly lanceolate, and the light spots of the outer 

 border are whitish. Expanse, 2.25-2.50 inches. 



Caterpillar, etc. — The early stages have not as yet been 

 worked out. 



This species, which is related to electa, may easily be distin- 

 guished from it by the pale marginal series of light spots, in the 

 male, between the sagittate spots and the dark outer marginal 

 lines, which latter are confluent, forming a solid dark outer bor- 

 der to the wing, while in electa they are separated by a narrow 

 band of light-brown spots. The female is also much lighter and 

 larger than in electa, as has been pointed out. The types which 

 came from the Caribou mining region of British Columbia are in 

 my possession, as are those of most of the other North American 

 species of the genus. 



(17) Argynnis hesperis, Edwards, Plate XII, Fig. 1, $ ; 

 Fig. 2, ? (Hesperis). 



Butterfly. — The male on the upper side of the wings is ful- 

 vous, shaded with dark fuscous for a short distance from the 

 base. The black spots of the median band are rather broad, and 

 seem to coalesce through dark markings along the nervules. 

 The under side of the fore wings is pale ferruginous, tinged with 

 a little buff at the tips, which, together with the outer margin, are 

 somewhat heavily clouded with dark ferruginous. The under 

 side of the hind wings is dark ferruginous, with a narrow buff 

 submarginal band, which in some specimens is almost lost. 

 The female is paler than the male in the ground-color of the 

 upper side, the black markings are heavier, the marginal lines fuse, 

 as do also the sagittate marginal markings, leaving the marginal 

 spots between them, which are quite light in color, deeply bor- 

 dered on all sides by black. The under side is like that of the 

 male, but darker and richer in color. In neither sex are the light 

 spots marked with silver; they are opaque, yellowish-white. 

 Expanse, 2.25-2.40 inches. 



Caterpillar, etc. — The life-history remains to be learned. 



This insect is not uncommon among the mountains of Colo- 

 rado. 



(18) Argynnis hippolyta, Edwards, Plate XII, Fig. 10, 3 

 (Hippolyta). 



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