No. 1. 



BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 



233 



ochreous yellow, and the hairs appear to be of the same color; the two faint transverse lines on 

 each segment being nearly obsolete, so that in some specimens they are not apparent, and the 

 body does not appear to be striped with black, as is so plainly the case in C. promethea. 



Compared with C. promethea of the same stage, the larvae of the present species are rather 

 smaller, and differ decidedly, the body being much paler, and not heavily striped with black, the 

 transverse black bands, so broad and deep black in C. promethea, being much narrower, very much 

 fainter, and often nearly obsolete; also all the tubercles and hairs, except those on the pro thoracic 

 and sometimes the tenth abdominal segments are pale yellowish, like the body. The tubercles 

 and setae on the prothoracic segment are not so dark as hi C. promethea. The upper pale stripe 

 on the head is a little narrower than in C. promethea. The black stripes on the last three abdom- 

 inal segments are somewhat heavier than those in front. The tubercles on the ninth abdominal 

 segment and the end of the anal or tenth segment may be dusky, while the dark stripes on the 

 segments in front may be entirely wanting. 



There is little difficulty in separating the larvae of the two species at the first stage. It is 

 noteworthy that the colors of the dorsal tubercles are not so much differentiated as in C. pro- 

 methea, as they are in a degenerate stage; the 

 dorsal tubercles of the second and third and the 

 first and seventh to ninth abdominal segments 



are not dark, as in C. promethea, but like those a 



on segments 2-6. The dorsal tubercles are a little 

 slenderer, and the setae or hairs rather longer, 

 than in C. promethea. The tubercles have the 

 same number of setae as hi C. promethea, the 

 single oneon the eighth abdominal segment having 

 10 setae, and being distinctly divided into halves. 

 There is no black patch on the side of the anal 

 legs, it being well marked in C. promethea, and 

 the thoracic feet are considerably paler. 



This stage was drawn at Providence, July S; 

 the second, July 13; the third, July 15; thefourth, 

 July 19; the fifth, July 26; the larva becoming 

 fully grown August 1. 



Figure 29. The last six abdominal segments 

 (V-X) of C. angulifera, winch should be compared 

 with the camera drawing of the same parts in C. 

 promethea to show how different the shapes of the fig. 29. 



tubercles are, the setae also differing in the two 



species at the same stage. The setae on the suranal plate have not been drawn. The setae are 

 transparent; d' , homologue of the "caudal spine" of Sphingidse; d, a seta enlarged. 



Stage II: Length 8 mm. The body is now longer hi proportion than before, and the head 

 is now no wider than the body. The head is black, and striped with whitish yellow the shape 

 and width of the pale stripes nearly as in stage I. The prothoracic segment has black dorsal 

 tubercles, and the black transverse dorsal band is divided into two patches, situated behind 

 the tubercles. The tubercles are now shorter than before, with shorter bristles, and those on the 

 second and third thoracic, and the first, eighth, and ninth abdominal segments, are slightly, 

 but not very noticeably, larger than before. The larva differs markedly from that of C. pro- 

 methea of this stage hi the faint, narrow transverse stripes, those of C. promethea being still 

 heavy and dark. There is no curved black spot on the side of the anal legs; the thoracic legs 

 are much paler than in C. promethea. The body is greenish yellow, while the ground color of 

 C. promethea is more of a whitish hue. Only the two last abdominal tubercles (on tenth seg- 

 ment) are dusky. (The figures of Mr. Bridgham agree with Miss Soule's description.) 



Stage III: Length 12 mm. The head now differs in being less black, the pale bands being 

 wider, and there are two white spots on the vertex, one on each side. The body is palo straw 



