1865.] 25 



at the edges; the adverse circumstances happening to attend the effort 

 to rear them in the valley below were enough to account for my want 

 of success. Mr. F. G. Sanborn has since discovered them, some drowned 

 in pools of water, but all living ones crawling about on the rocks whex'e 

 this lichen grows, though never feeding. 



In a paper already referred to, entitled • Remarks ou some charac- 

 teristics of the Insect Fauna of the White Mountains, N. H." when 

 speaking of this insect, I remarked as follows: -whether or not it is 

 distinct from those of Greenland and Labrador, or the numerous, but 

 most closely allied spBcies which have been described and figured from 

 northern Europe, I cannot, from the confusion in which the spe- 

 cies of this genus appear to be, and for the want of any specimens from 

 other quarters, at present determine, but satisfy myself, on this occa- 

 sion, with a more detailed description of the species than has yet been 

 o-iven. only suggesting, that should it ultimately prove to be distinct, 

 it will only be a case analagous to what we find in the species next to 

 be mentioned," i. e. the presence upon the barren summits of a species 

 of Argynnis {A. Moiituim Scudd.), distinct from, though closely allied 

 to A. Boisduvalii 8omm., found farther north. Only a month or two 

 afterwards Mbschler's Memoir on the genus Chionohas in Europe ap- 

 peared, in which the species described by previous authors were treated 

 to a thorough revision, so that every difficulty from that source van- 

 ished, and at the present time the opportunity of examining quite a 

 number of individuals from various parts of this country, belonging to 

 all the hitherto described species recognized on the continent, has sat- 

 isfied me that the conjecture ventured there is fully established; but I 

 have found that the description last given by me, though • more de- 

 tailed" than any previous one, was still not explicit enough to be used 

 satisfactorily in distinguishing it from the allied species, and have 

 therefore presented one here which will be sufficient, I hope, for that 

 purpose. 



It is more nearly allied to C. Oeno than to any other Chionohas. thf 

 two being true representative species rather than what I have termed 

 equivalent species or species of replacement (Proc. Bost. Soc. Nat. Hist. 

 IX. 106) ; it is. moreover, more nearly allied to those forms of the spe- 

 cies which have been called C. Oeno by Boisduval than to those he 

 would place in C. Also, although he referred it to his 0. Also. 



7. Chionobas Nevadensis. 



Chionobas Xevadcruns Boisduval MS., Behr. Proc. Calif. Acad. Nat. So. III. 163. 



Another species of Chionohas is referred to by Dr. Behr in his in- 



ter'^sting "Notes on Californian Satyrides" (1. c. pp. 163 — 166) not 



