84 



BULLETIN UNIVERSITY OF MONTANA. 



GENUS POLYGONIA, HUBNER. 

 The Angle-Wings. Fig. 67. 



Butterfly — Medium sized or small, characterized by the more or less 

 deeply excavated inner and outer margins of the fore wings, the tail-like 

 projection of the hind wings at the extremity of the third median nervule, 

 the closed cell of the fore wings, and the thick covering of scales on the 

 upper side of the palpi, while on the sides and tops of the palpi there 

 are but few scales. They are tawny on the upper side, spotted and 

 bordered with black; on the under side mimicking the bark of trees and 

 dead leaves, often with a C-shaped silvery spot on the hind wings. The 

 insects hibernate in the butterfly form in hollow trees, under bark and 

 leaves, and like places. 



Early Stages — The eggs taller than broad, tapering upward from the 

 base. The sides are ribbed. They are laid in clusters or in a short 

 string-like series. The caterpillar is cylindrical, adorned with rows of 

 branching spines. They feed upon the nettle, elm, hopvine, and other 

 plants 



Fig. G7. Venation of Polygonia. 



Key to Species. 

 Small, under side crossed by a pale gray or white band 

 Under side marked with dark and pale shades, heavy 

 above 



gracilis. 



black border 

 faunus. 



