Genus Argynnis 



most easily distinguished by the fact that the hind wings are 

 uniformly dark cinnamon-brown, without any band of buff on 

 the outer margin. Expanse, 2.50-3.00 inches. The insect flies 

 from late June to the end of August. 



Egg. — Greenish, conoidal, with about eighteen vertical ribs. 



Caterpillar. — Head black, yellowish behind. The body vel- 

 vety-black, ornamented with black spines which are yellowish at 

 their basal ends. The caterpillar feeds on violets. 



Chrysalis. — Reddish-brown or gray, irregularly mottled and 

 striped with black, the abdominal segments slaty-gray, marked 

 with black on the edges where the short angular projections are 

 located. 



This butterfly is found in the Western States, extending from 

 the prairie lands of northwestern Ohio to Montana. It largely 

 replaces aphrodite in these regions. 



(10) Argynnis nausicaa, Edwards, Plate XI, Fig. 9, 6 (The 

 Arizona Silver-spot). 



Butterfly. — The species is related to the foregoing, but is 

 rather smaller in size. The upper side of the wings is dusky 

 reddish-brown, with the characteristic markings of the genus. 

 On the under side the fore wings are pink, laved with buff at the 

 tip. The hind wings on this side are deep cinnamon-brown, 

 mottled with buff on the inner two thirds ; a narrow but clearly 

 defined submarginal band of bright yellowish-buff surrounds 

 them. The silvery spots are clearly marked. The female has the 

 black markings broader and more conspicuous than the male. 

 Expanse, 2.25-2.50 inches. 



This insect is quite common in the mountain valleys of Ari- 

 zona, at an elevation of from six to seven thousand feet above 

 the level of the sea, and flies in July and August. We have no 

 knowledge of the early stages, but it probably does not differ 

 greatly in its larval state from the allied species of the genus. 



(11) Argynnis atlantis, Edwards, Plate X, Fig. 9, 6 ; Plate 

 V, Fig. 6, chrysalis (The Mountain Silver-spot). 



Butterfly. — This insect, which resembles aphrodite, is distin- 

 guished from that species by its smaller size, its somewhat nar- 

 rower wings, the deeper brown color of the base of the wings on 

 the upper side, and their darker color on the under side. The 

 submarginal band is pale yellow, narrow, but distinct and always 

 present. Expanse, 2.50 inches. 



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