144 An^tals Entomological Society of America [Vol. IX, 



adjacent on the meson; median line distinct on the prothorax 

 and mesothorax; caudal portion of mesonotum and the meta- 

 notum depressed adjacent to the wings; wings with their 

 distal margin always raised above the level of the dorsal surface 

 of the body; first pair of wings with their anal angles rounded 

 and opposite the cephalic margin of the fourth abdominal 

 segment ; second pair of wings visible along entire dorsal margin 

 of first pair; abdominal segments 8 to 10 tapering rapidly 

 to form a cone; cremaster absent. 



This genus includes two species in North America. Both 

 of these, C. promethea and C. angulijera, are found east of the 

 Mississippi. The cocoons of C. promethea resemble those of 

 P. walkeri, but are more common, dangling in clusters from 

 almost every spice bush, wild cherry and many other food 

 plants in regions where they occur. Promethea cocoons are 

 grayish brown in color, usually darker than walkeri cocoons 

 and cylindrical in shape, generally blunt at the caudal end. 

 They are suspended by a long band of silk from the cephalic 

 end which usually fastens the encircling leaf to a twig together 

 with the cocoon. C. angulijera is comparatively rare and 

 its cocoons are seldom found suspended from twigs, but are 

 usually found among fallen leaves at the base of a tree. They 

 are ovoid, dull brownish gray in color, with the valvular arrange- 

 ment of loose fibers of silk at one end. The walls of the cocoon 

 are thicker than promethea cocoons and more readily separated 

 into layers. 



The following table will serve to separate the pupae of this 

 genus : 



A. Dorsal cephalic margins of abdominal segments 5-7 produced into a 

 flange-like ridge, widest at meson and ending opposite spiracles; spiracular 

 openings at the bottom of a lenticular depression; dorsal margin of second 

 pair of wings scarcely bisinuate. promethea. 



AA. Dorsal cephalic margins of abdominal segments never produced into 

 a flange-like ridge; spiracular openings with a lenticular, elevated, smooth, 

 rounded margin; dorsal margin of second pair of wings deeply l)isinuate. 



anfi,tdifera. 



Callosamia promethea Drury. — Color generally yellowish, 

 dark brown on the middle of the back and around the margin 

 of spiracles, sometimes on the wings; dorsal aspect of thorax 

 and abdomen with deep, wavy, transverse striations, fine, inde- 

 terminate striations on face parts, wings and legs, the remaining 

 surface practically smooth; dorsal cephalic margins of abdom- 



