22 LEPIDOPTERA. 



B-. A large obscure clavk brown sjDot occupies the middle of 

 the wing. 0. criedana. 



A^. Fore wings purplish-brown. 0. rvfana. 



A^. Fore wings glistening light purple-red. 0. purpurana. 



A*". Fore wiugs dark crimson, faintly dotted with silvery 

 white. 0. arhutella. 



A'. Fore wings purple-crimson, faintly latticed with darker. 



0. mygindana. 



1. O. branderiana, Linn. — Expanse f to 1 inch (21-25 

 mm.). A large species, silky olive-brown ; fore wings often 

 with one or two broad transverse dark brown bands. 



Antennas dark brown; palpi, head, and thorax olive- 

 brown ; abdomen paler brown. Fore wings ample, broad 

 and without fold, silky or faintly glistening ; costa arched 

 toward the base, apex bluntly angulated ; soft olive-brown 

 without markings, or else paler olive-brown with, more or 

 less distinctly, a large deep umbreous basal blotch with its 

 outer margin in part erect, the rest oblique ; and a dark 

 brown central band, irregular, but very broad on the dorsal 

 margin, and diminishing to a mere point at the costa ; cilia 

 olive-brown. Hind wings smioky brown with a golden gloss ; 

 cilia dull white. Female similar, or sometimes having the 

 markings more distinct. 



Underside of the fore wings dull leaden-brown. Hind 

 wings leaden-white. 



On the wing at the end of June and in July and August, 

 occasionally to the beginning of September. 



Larva slender, vqvj active, when young nearly black, with 

 raised black dots, bearing hairs ; when more grown, head, 

 dorsal plate, and claw-feet black, the dorsal plate bordered 

 in front with white. (Zeller.) When full grown, dirty pale 

 green. 



May, in a folded, joined, or rolled leaf of aspen (^PojntJus 

 trcmnia); ako on Popidus cancseens. 



