THE CANADIAN ENTOMOLOGIST. 197 



^ray and black. A distinct fuscous band as in Chryxus crosses the wing • 

 it has a sharp tooth extending out on the upper branch of median nervule 

 and occasionally one also in the last median interspace. Within this band 

 is another, less distinct and often partly obsolete, but corresponding with 

 the inner crenate band of secondaries. Near the outer margin is a border 

 of sprinkled fuscous scales, condensed inwardly to a line which is nearer 

 the margin than the similar one in Chryxus. The cell is closed by a bar 

 of dark fuscous. 



Ground color of secondaries gray with a tint of ochraceous, mottled 



with black ; the ocellus of the upper side is always more distinct, even 



when absent above it is indicated below. The usual band of secondaries 



is as a rule distinct, though sometimes hardly distinguishable from the 



ither mottling of the surface ; as in Uhleri, the border is crenulate, quite 



viable as to the depth of the crenulations ; the inner border with a 



lS where it crosses the median nervure, in these respects much dike 



i us. 



tale — Expanse 21V to 2 T 4 o inches. Primaries ochraceous above ; 

 and of under side shown distinctly in fuscous, its tooth on upper 

 bu •• h of median nervure very noticeable ; the nervures fuscous. Costa 

 and outer margin rather broadly bordered with grayish fuscous ; this bor- 

 der usually becomes obsolete near the angle of the wing, except a narrow 

 line at the margin, which is always dark fuscous. 



The two ocelli mentioned in the description of the male are always 

 present in the female ; usually also another on either side of the lower 

 ocellus — in that case four in all. 



Secondaries as in the male. 



Margins of the fore wings entire, of the hind wings slightly crenulate 

 in the male, decidedly so in the female ; fringes fuscous cut with white. 



C Ivallda is distinguished immediately from Chryxus by the pale 

 color ; there is no trace of the fulvous tint shown by most of our Western 

 species of Chionobas. The color, in fact, is almost exactly that of the 

 curious Hipparchia Ridin^sii, which has not only the appearance, but the 

 habits of a Chionobas. 



C Ivallda is here described from 39 £ 8 °. , one pair of which were 

 taken by Mr. Morrison at Summit, and the rest by myself on Freel's Peak 

 and Tallac Mountain, all three localities being within a few miles of Lake 

 Tahoe, near the boundary line between California and Nevada. They 



