128 BUULiETIN 15 7, U. S. NATIONAL MUSEUM 



wings are broadly margined with white. A closely related dwarf 

 form occurs in the West Indies, and there are various other forms, 

 more or less well marked, in the West Indies and in Central and 

 South America. 



Subfamily Libytheinae 



Genus LIBYTHEA Fabricius 



LIBYTHEA BACHMANII Kirtland 



Snout Butterfly 

 Plate 6, Figures 2, 3 



Occurrence. — Very local. Mr. Shoemaker has specimens from 

 Arlington County, Va., near the end of Free Bridge, and Dr. Wil- 

 liam Schaus has taken it in the same general region and also along 

 the canal. 



Remarks. — The snout butterfly passes the winter as an adult and 

 appears in May. Fresh butterflies are seen throughout the summer. 

 In this region there are probably three broods and a partial fourth. 



This species grows more rapidly than any other of our butter- 

 flies. W. H. Edwards found that the time from the laying of the 

 egg to the emergence of the adult is 15 to 17 days. 



Except for the fact that it occurs, we know nothing of this species 

 in the District. 



The four specimens in the Schonborn collection, all of which 

 are fresh, were taken on August 12. 



Family RIODINIDAE 



No species of this family has been recorded from the District or 

 from its immediate vicinity. One species is to be looked for here, 

 and there is a possibility that another might be found as a casual. 

 Both are very small mothlike butterflies with the curious habit of 

 resting on the undersurface of leaves with the wings spread out and 

 resting on the surface of the leaf, like geometrid moths. Even if 

 fairly common, they are likely to be overlooked. These are con- 

 sidered in the appendix (p. 247). 



Family LYCAENIDAE 



KEY TO THE LOCAL SUBFAMILIES 



a\ Hind wings not lobed at the inner angle. 



6\ Hind wings below yellow-brown with large blotches of darker 

 more or less outlined with white ; wings above dull golden 

 and dark brown Gerydinae (p. 129). 



&^ Hind wings below whitish or butty gray, with small black or 

 dark-brown spots; wings above blue, or the fore wings 

 coppery red and the hind wings dark gray Lycaeninae (p. 131). 



