Butterflies 223 



iessellatus Scudder, and the much larger Silver-spotted Skipper, 

 Epargyreus tityrus Fabricius. The latter will readily be known 

 by its long front wings, and the splendid silver-white markings 

 on the under side of the hind wings. Although it is common with 

 us, it is a species of tropical affinities, ranging south to Central 

 America. The larva feeds on leguminous plants. Very recently 

 (1924) B. C. S. Warren has described a new Skipper, Hesperia 

 freija, which is found at 13,000 feet altitude in Colorado, and 

 ranges to Labrador and northern Europe. 



Two other families of butterflies, the Libytheidae and Rhio- 

 dinidae, have been found in Colorado, but the single representative 

 of the first, and the two of the second, are not commonly observed. 

 Libythea has the straight palpi greatly extended, resembling a 

 snout. The larva feeds on hackberry (Celtis). In former times 

 the Libytheidae were probably more abundant, as two species 

 have been found fossil at Florissant. 



