on the gemis Colias. 19 



Judging from the materials at my disposal, which, 

 though pretty large, are by no means equal to those 

 which Dr. Hagen had, I see no reason to doubt the 

 truth of this, and I do not find any characters which 

 are present in one or other of these species that are not 

 sometimes to be found in the others. 



The point, however, remains to be settled whether the 

 Pelidne described by Boisduval, of which the type cannot 

 be found, was the same as interior, Scudd., which Dr. 

 Hagen seems to doubt.* 



The geographical distribution of the species would, in 

 case of the correctness of my views, be circumpolar ; 

 but, if interior and Pelidne are distinct, it has yet to be 

 unravelled. The American forms range from Labrador, 

 all over British North America to Alaska, and the 

 Pacific and Rocky Mountain States, occurring, as it 

 seems, wherever the climate is of an arctic character. 



PS. — Since this paper was read I have seen, in the 

 6th number of ' Papilio,' 1883, which reached me in 

 February, 1884, Mr. W. H. Edwards' reply to Dr. 

 Hagen's paper, in which he laughs to scorn the notion 

 of uniting any of these so-called species. I can only 

 say that after reading it carefully, I fail to see that he 

 has seriously shaken Dr. Hagen's position, and he 

 certainly has failed to point out how these forms may be 

 distinguished in all cases from each other, though picked 

 specimens no doubt would afford slight distinctive 

 characters. In the same number of 'Papilio ' he describes 

 another new species ? under the name of C. Hageni. I 

 have just had an opportunity of hastily looking over a 

 number of specimens collected in the Saskatchewan 

 District in 1883 by Capt. Geddes, in Mr. H. Smith's 

 collection, and am more puzzled than ever. Some of 

 the forms which Dr. Hagen considers to belong to 

 interior certainly seem to have more affinity to Philodice, 

 but Mr. Edwards denies stoutly that any example of 

 Philodice was ever seen in the Rocky Mountains, in 

 Oregon or within a thousand miles of it. The question 

 must remain unsettled until much more is known about 

 the forms occurring in British America. 



* I have just heard from Dr. Stauclinger that the type of 

 Pelidne in Sommer's collection, which he now possesses, is the 

 well-known form from Labrador. 



