54 LEPIDOPTERA OF NORTH AMERICA. 



Upper side of secondaries deep brown, with a greenish blue 

 reflection and the base red ferruginous. 



Under side of all the wings grayish, marbled with brown; some- 

 times ferruginous or brownish, with the extremity a little more 

 clear ; often brown, slightly glossed with greenish white, especially 

 on the secondaries. # On the disk, a silvery spot, sometimes in the 

 form of a C, sometimes in the form of an interrupted C or mark 

 of interrogation. In most of the varieties, there is a row of black 

 points on the terminal edge of each wing. The secondaries are 

 furnished with prominent tails. 



Larva deep brown, with the body pointed and striated with 

 yellowish and whitish. Head and feet reddish, spines blackish. 

 Along the feet a ray of citron yellow, and above the stigmata 

 another ray of the same color, marked with a row of red spots. 



Chrysalis angular, obscure, with golden spots. Feeds on Ulmus 

 and Tilia. 



United States. — Expands two and three-quarter inches. 



Boisd. 



2. G. comma Harris. Ins. Mass. 221 (1842). 



Upper side tawny orange ; fore wings bordered behind and 

 spotted with black ; hind wings shaded behind with dark brown, 

 with two black spots on the middle and three more in a transverse 

 line from the front edge, and a row of bright orange-colored spots 

 before the hind margin ; hind edges of the wings powdered with 

 reddish-white. 



Under side marbled with light and dark brown, the hinder 

 wings with a silvery comma in the middle. 



The caterpillar has a general resemblance to that of G. inter- 

 rogationis. 



Chrysalis brownish gray, or white variegated with pale brown 

 and ornamented with golden spots ; there are two conical ear-like 

 projections on the top of the head, and the prominence on the 

 thorax is shorter and. thicker than that of G. interrogations, and 

 more like a parrot's beak in shape. 



Expands from two and a half to two and three-eighths inches. — 

 Harris, Insects of Mass., p. 221. 



Harris thinks that his G. comma is different from the European 

 G. C-album, which Boisd. et Lee, p. 190, describe as occurring 



