BlOGBAPHY OF ITeMILEUCA MaTA. 145 



Fourth molting. — June 28-29. Length, one inch and one-tenth; 

 diameter, two-tenths of an inch ; inchiding bristles, four-tenths of an 

 inch. Upon first emerging from the old skin, the head and all the 

 spines are pale red. After a few hours, the head becomes reddish- 

 brown, and the spines of their normal color; the body is black with 

 numerous small, whitish, oval papillae, from each of which a short black 

 hair proceeds. The stigmata are acutely ellipsoidal and Avhite. 



The head-cases of the larvfE with the spined collar adhering by one 

 of its corners, with few exceptions remained attached to the cast skin, 

 in this and in the following molting. 



On transferring the larvge to fresh leaves on the afternoon of the 9th 

 July, five were found in position for molting, attached by their prolegs 

 to the twigs, with their heads downward. On the morning of the 

 loth, nearly all had taken their position. Length, 2.5 inches ; diameter, 

 .28 of an inch. 



Fifth molting. — July 11-12. Length, one inch and one-half; 

 diameter, one-fourth of an inch. The superior spines on segment 2, 

 have short, fascicular, tawny, black-tipped spinules, like those of the two 

 dorsal rows, encircling their base; on segments 3-11, the lateral row 

 of spines (second from above) have similar fascicular spinules bor- 

 dering the upper half of their base, as have also the two ante-superior 

 spines of segment 12 at their anterior basal half. This interesting 

 impartation of the characteristic features of the seventeen dorsal fascicles 

 to each one of the surrounding spines, to a greater or less extent, encircl- 

 ing some and bisecting others, is a feature developed at this molting. 



At no stage of its growth, is the exuvia eaten by the larva, as is done 

 by llyperchiria lo at its first and second moltings, but probably not 

 at those later. 



On the 17th July several of the larvae descended from the branches 

 on which they had been feeding, and gave indications of having attained 

 maturity. 



Mature larva. — Length from one and three-fourths to two and one- 

 half inches ; diameter, three-tenths, or, inclusive of lateral si^ines, six- 

 tenths of an inch. The head is round, depi'essed at the clypeus, with 

 a few short, brown hairs. The collar is glossy and is bordered in front 

 Avith four of the eight spines, directed somewhat anteriorly, with which 

 the first segment is armed. The body tapers moderately at the 

 extremities, is fuscous, sometimes black, sprinkled with numerous 

 whitish, oval spots bearing each a short fuscous hair, which are con- 

 fluent along the stigmata. The two superior rows of spines on seg- 

 ments three to ten inclusive are fascicular, spreading over the anterior 

 half of the segment, thirty to forty in each fascicle, cylindrical, tawny- 

 colored, tapering near their apex to an acute black tip ; the spines of the 

 [Assem. Ko. 133.] 19. 



