OF NORTH AMERICA. 27 



above a regular broad elliptical form, with very even sides. The 

 eighth ring is not enlarged, but the body from that ring tapers pos- 

 teriorly rather rapidly to the tip, though not by any means so much so 

 as in Eudryas. The abdominal legs are short, thick and hairy, and 

 the thoracic legs are still more bristly. " 



"The hairs on the upper part of the larvee are collected into a 

 mesial line of slight tufts. The head seen from above is concealed 

 by dense over-arching hairs. True and false [abdominal] legs covered 

 by lateral radiating hairs. The outline of the tergum is hardly tufted, 

 but rather scolloped, the scollop on the third and twelfth rings of the 

 body being most prominent, becoming short thick tufts. The hairs 

 when magnified are seen to have long thick-set spinules. " 



" The specific characters are these : The body of the larva is purpl- 

 ish livid, covered with white and yellow hairs. Those hairs on the 

 first two thoracic, and last two abdominal rings are all white. The 

 head is a bright shiny red, black in front. There is a sub-dorsal and 

 lateral row of bright yellow elongated spots, one for each ring, which 

 are conspicuous through the hairs. Thoracic legs, black ; abdominal 

 legs, reddish, nearly concolorous with the head." 



"A few specimens in the fourth [.?] stage, i. e. . that next to the last 

 moulding, differed thus : They are more oblong in outline. Those 

 hairs which in the full-fed larva were described as white, are here 

 black. The mesial line of scollops here become actual tufts and 

 black in color, of which the first and last are the longest. The hairs 

 over-arching the head and tip of the abdomen are whitish gray. The 

 colors of the body and the two rows of yellow spots are the same as in 

 the mature larva." 



Dr. Packard further states that the cocoon is composed entirely of 

 the hairs from the body of the larva, which are held together by the 

 minute spinules with which they are beset. "No silk is spun through- 

 out the whole operation. I afterwards carefully examined portions of 

 the cocoon under the microscope, and could detect no threads of any 

 kind." From a larva which assumed the pupa state, June 17th, the 

 imago was evolved July 15th. "The female laid smooth green 

 spherical eggs in a patch, side by side upon the side of the vessel, 

 which hatched out July 28th. The young larvae were about twice the 

 size of those of Orgyia when of the same age. They had large heads, 

 and the body gradually decreased in size towards the opposite extrem- 

 ity. The hairs were sparse, long and rather uneven, much resembling 

 young Orgyise. It will be seen that the larva lives twelve days in the 



