PL. XXVIt 



side mottled conspicuously with paler shades. 

 2.00-2.15 inches. The larva feeds on willows. 



Expanse 



Ranges from New England and Ontario to the Carolinas, 

 thence westward to the Pacific. 



As I have remarked of the genus Argynnis that it is difficult, 

 so also I may say of the genus Grapta that it provokes much 

 discussion among those who have not had the opportunity 

 to study full series of specimens of the various species. The 

 resemblances are very great, and the differences are not ac- 

 centuated, so that the superficial observer is easily led astray. 

 The differences are, however, valid, even on the upper side 

 of the specimens, which are more nearly alike than the lower 

 side. Take the two species here presented to view on opposite 

 pages. They resemble each other closely, but the student 

 will soon see that there are differences, and these are constant. 

 On the under side they are very great, G. faunus being light 

 in color below, while G. silenus is very dark. In both species 

 at the end of the cell of the hind wing there is on the under 

 side a silvery spot which has the form of an inverted L ( r l), 

 or is rudely comma-shaped. 



