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 larvae 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, aud 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 Hem deuca 

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

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

 fif ty -ei ght d ays. * 



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, live-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 rutescent, 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 pseud acacia\ 

 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 IV. Y. State Cabinet, 1872, p. 148. 



