HOW TO KNOW THE BUTTERFLIES 



The Dreamy Dusky-wing 

 Thanaos icelus (Than'a-os i-ce'lus) 

 Plate XLV, Fig. i 

 The upper surface is blackish brown, the fore wings sprin- 

 kled with pale bluish scales ; these are most abundant on the 

 outer half of the wing ; and just beyond the middle of the 

 wing, they form a distinct hoary patch, which extends from 

 the costal margin nearly half-way to the inner margin. There 

 are no distinct white spots on the fore wings as in the follow- 

 ing species. The hind wings have two irregular rows of dull 

 yellow spots parallel with the outer margin. Expanse of wings 

 from one and one-tenth to one and one-fourth inches. 



This skipper is found in nearly all parts of the 

 United States. The larva will feed on aspen. 



Lucilius's Dusky-wing 



Thanaos lucilius (Than'a-os lu-cil'i-us) 



Plate XLV, Fig. 4 



The wings are dark brown above with a row of small white 

 spots just before the apex of the fore wings and a single one in 

 cell M a . The fore wings are crossed just beyond the middle 

 by a transverse paler band, which is fairly well defined ; this 

 is the most important characteristic distinguishing this species 

 from the following. Expanse of wings from one and one- 

 tenth to one and one-fourth inches. 



This species is found in the Atlantic States. 

 The larva feeds on the wild columbine and on 

 pigweed. 



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