204 THE CANADIAN ENTOMOLOGIST. 



It is easily separated from Henrici by the presence of the discal 

 stigma in the male, the absence of "tails" on the secondaries, the hoary 

 margin and the prominence of the siibmarginal dots on the primaries 

 beneath. The latter are in Hetirici missing (usual) or at most represented 

 by blurred clouds slightly darker than the yellow-brown ground. 



From irus it may be distinguished by the relatively uniform colour 



of the basal area of the secondaries beneath (in irus this is strikingly 



variegated), the absence of tails, the hoary margin of the primaries, and 



by the almost total obliteration of the black-pupiled eye-spot, which in 



irus is a salient feature of the wing ornamentation, occupying the 

 interspace between the first and second median nervules of the secondaries 

 beneath. 



Folios most nearly resembles Mossi (Hy. Edwards), from which it 

 differs in the presence of the hoary margin of the primaries, the broad 

 hoary area of the secondaries (in the type Mossi these whitish scales are 

 confined to a small space along the inner margin, and elsewhere replaced 

 by large chestnut-brown spots, surmounted by black crescents), and in the 

 colour of the fringe. 



Five specimens from other localities in the collection of the junior 

 author are confidently referred to this species ; they bear the following 

 labels : f^ and ? , Calgary, Alberta (no date) ; V 9 ? » Graham's Park, 

 on Rio de los Finos, Cal., May nth and 12th, 1S99. 'J'here are also 

 specimens in the Museum of Natural History, New York City, and in the 

 National Museum at Washington, labelled Colorado, which agree very 

 closely with our specimens. 



Undoubtedly polios has been confused by collectors with irus, 

 Henrici o\ Mossi. and it is quite possible that the specimens mentioned by 

 Scudder* as varietal forms of irus, having "the outer margin of the 

 primaries. . . .narrowly hoary," should be referred to this species. 



The types have been deposited in the U. S. National Museum ; 

 paratypes Nos. i and 2 have been sent to the Museum of the Entomo- 

 logical Society of Ontario ; !)aratypes Nos. 3 and 4 were presented to Dr. 

 Henry .Skinner, of Philadelphia ; paratypes 5 and 6 arc now in the New 

 York- State Museum at Albany, and the other paratypes remain for the 

 present in the collections of the authors. 



'Butterflies of the Eastern U. S. and Canada, p. 837. 



