186 THE BUTTERFLIES OF Till: 



pink. The hind wings have a discal silvery C. Both 

 wings have the submarginal row of dots in a more or 

 less distinct band of olive and ferruginous brown. In 

 the female these shades are not so distinct, with less 

 pink, in some specimens the whole surface being washed 

 somewhat with blue-gray. 



This is a dimorphic species, the last brood of the 

 summer, or the one that hibernates, being known as the 

 winter form, HARRISII, Edw., from which the above 

 description is taken. The summer forms are called 

 DRYAS, Edw., and differ from the others in having the 

 hind wings above suffused with black, as in Umbrosa of 

 the preceding species, and the under side more suffused 

 with brown. 



This species feeds on the same plants as G. Interroga- 

 tionis. 



The eggs are green, and similar in form to those of 

 that species, with ten longitudinal ribs and cross-strife 

 between them. 



The young larvae are one-tenth of an inch long, 

 black, covered with short hairs. After the first moult 

 the color is either brown-black or black, with whitish 

 lines at the junctures of the segments ; armed with seven 

 rows of branching spines, stout, black, and beset with 

 short bristles. In the black examples all the tubercles 

 are black; in the specimens with white lines, on seg- 

 ments 4, 6, 8, and 10 the spines spring from whitish tu- 

 bercles. Besides these there is a row of minute spines 

 over the feet. Head dark brown. After the second 

 moult the color is dark olive-brown, or black-brown, or 

 reddish brown, two or three fine white transverse lines 

 to each joint, and two white bars on the back. After the 



