46 BULLETIN UNIVERSITY OF MONTANA. 



dered with black than the females, and on the first median nervule of the 

 hind wings there is a black scent-pouch. Body black with w'hite spots. 



Early Stages — When first deposited the eggs are white, but in two 

 or three days turn yellow, just before hatching change to dull gray. Some- 

 what conical in form, and marked by twenty-five ribs with the same num- 

 ber of transverse ridges. The young larva is yellowish white, with a 

 large black head. The mature larva is about 1.75 in., 45 mm. long; 

 the head yellowish marked by two triangular black stripes. The body is 

 marked with transverse stripes of black, yellow, and white. It is fur- 

 nished with black fleshy thread-like appendages. 



Chrysalis — About 25 mm. long, pale green, spotted with gold. There 

 are two or more broods in a season. 



Distribution — United States generally. The collection of the U. of 

 M. contains specimens from Missoula, the Ruby Mountains, and Miles City. 

 Collected by Coues along the 49th parallel in 1874. 



