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. io ? 6 
(Hippolyta). 
