148 TWENTY-FOURTH REPORT ON THE STATE MUSEUM. 



stigmatal row, the branches are all bristle-pointed, as also in the 

 interrupted substigmatal row : the caudal plates have at their poste- 

 rior angle, a rudimentary spine. , 



Pupation. On the 21st of August, one of the larvse made its 

 slight cocoon between a couple of leaves. On the 17th of the fol- 

 lowing month, a male imago emerged from pupa ; on the 21st, a 

 second male was disclosed, and some other of the moths emerged dur- 

 ing the fall. 



The cocoons were kept in a warm room, and some time during the 

 month of January, a crippled imago was found in the box. On the 

 7th of February, a second crippled specimen was obtained, and on 

 the 10th, a perfect one, small and unusually dark colored. 



In the irregularity of its disclosure, and in its extension over the 

 fall and spring months (extending to the latter when not prema- 

 turely developed by warmth) this species resembles Hemileuca 

 Maia. Its shortest period of pupation as above observed, was less 

 than half that of Maia, being but twenty-seven days, and in Maia 

 fifty-eight days.* 



As an addition to the history of this moth, the following extracts 

 are taken from notes made several years since : 



Eggs were deposited July 10th. They are elliptical, somewhat 

 flattened, five-hundredths of an inch in diameter, with a small black 

 spot on each end and a larger orange one on the side. The caterpil- 

 lars emerged July 22d. They are one-eighth of an inch long, of a 

 reddish color, and have the body covered with long bristles. 



On the 27th of July, occurred the first molting, when they 

 measured one-fourth of an inch in length. The head was black, 

 body rufescent, with black branching spines, and several stripes. 



The second molt was on August 3d : length one-half inch. The 

 larvae are still associated in groups while feeding. 



At the third molt on August 9th, they had attained a length of 

 seven-eighths of an inch. The black spines have a few of their upper 

 branches black, the others being white as before. 



Fourth molt, August 17th : length of larva one inch and one-fourth. 

 The fifth molt, pupation, et cet., were not recorded. 



I have taken the larva feeding on locust (Robinia pseudacacid), 

 on choke-cherry (Cerasus virginiana) on willows and other plants. 

 A colony found on a willow, the leaves of which had become partially 



* Twenty-third Report on the 2f. Y. State Cabinet, 1872, p. 148. 



