no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 237 



makes two scallops on each side. Front edge of each segment dark, but the base of each 

 tubercle is surrounded by white. 



It moulted June 11, all the individuals casting their skins simultaneously, just as all were 

 observed to hatch at the same or nearly the same moment. 



Stage II: Length 11-13 mm. The body is rather thick and the thickness uniform. The 

 head is not nearly so wide as the body. It is peculiar in shape and color, rather deeply bilobed; 

 the surface soft velvety black-brown, apex of the clypeus pale greenish ; between this triangular 

 spot and the eyes is a deeper yellow roundish spot, and behind each group of ocelli is another 

 long yellow mark; clypeus-anterior white, labrum black. 



The body is armed with large, rather high tubercles, all nearly of the same size, though 

 those of the second and third thoracic segments are very slightly larger than those on the 

 abdominal ones, and that on the middle of the eighth abdominal segment is nearly twice as 

 thick as those on the seventh segment. 



On the prothoracic segment are four large high tubercles of equal size and height, but 

 slightly smaller than those on the second and third thoracic segments, each with four stout 

 spines and four smaller ones. All the tubercles are fleshy and stand up hke columns, and are 

 about twee as high as thick. The median tubercle on the eighth abdominal segment bears 

 twelve setse arranged six on each side of the crown ; those on the ninth segment with four large 

 seta?. 



Suranal plate with two large erect tubercles from a third to a half smaller than those on 

 the ninth segment, and bearing five large, long, and five finer setae; farther back near the end 

 are two small low tubercles bearing from two to three coarse, and two or three finer bristles. 

 Anal legs with setiferous tubercles on the hind edge. 



The body is uniformly deep ochreous yellow. The first thoracic segment is prussian or 

 dark steel blue, but yellow on the hinder edge, with a yellow spot on the side, or the segment 

 may be all yellow except around the base of the tubercles; the other segments are yellow. 

 Suranal plate and anal legs of a rich dark steel blue. On the front edge of each segment 

 (thoracic 2-3 and abdominal 1-8) there are three dorsal triangular black-brown spots which 

 are usuaUy connected by a black fine along the suture; behind these spots on each segment 

 is a similar black line dilating into three triangular spots which vary in being either connected 

 or separate. Spiracles dark, on a dark ground. Both thoracic and abdominal legs black; 

 underside of the body blackish. 



In this stage the markings are much as in C. promethea, i. e., the two transverse black 

 bands, but they are farther advanced or more specialized, and the head is without the trans- 

 verse pale band in front; the prothoracic and other tubercles are the same. They are of the 

 same general proportions, but in color C. calleta is darker, especially beneath, and on the suranal 

 plate and legs calleta has longer bristles. 



End of stage II: When about to molt (May 26) it is 23 mm. in length. The head in my 

 example was very small, and is just as described in stage II, but with traces of another yellow 

 spot. At this time the body is much less spotted and marked with black-brown. The first 

 thoracic segment is ochre-yellow, with four iregular black spots along the hinder edge, while 

 the area around the base of the four tubercles is blackish. All the tubercles are smaller in pro- 

 portion to the body, but preserve the same proportion to each other as in the beginning of 

 stage II; the body being larger, the tubercles are wider apart. 



Each segment behind the first thoracic with two series of three blackish triangular spots, 

 the middle one in front triangular and longer than the lateral ones (as in the early part of the 

 stage) . The one corresponding to it on the liinder line (which is half-way between the dorsal 

 tubercles and the hinder edge) is transversely linear; the spots vary in being either separate 

 or connected; they are smallest on the eighth and ninth abdominal segments. All the tubercles 

 are uniformly dark prussian or steel blue. Suranal plate yellow, except the black subtriangular 

 patch giving rise to the tubercles. Along the side below next to the base of the legs is a series 

 of detached greenish yellow spots, the two on the second and third segments centered by a 



