OF ARTS AND SCIENCES. 71 



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 8; the 2d, July 13; 

 the 3d, July 15; the 4th, July 19; the 5th, July 26; the larva 

 becoming fully grown August 1. 



Figure 5 (Plate II.). The last six abdominal segments (V.-X.) of 

 G. angulifera, which should be compared with the camera drawing of 

 the same parts in G. promethea to show how different the shapes of the 

 tubercles are, the setae also differing in the two species at the same 

 stage. The setse on the suranal plate have not been drawn. The 

 setaj are transparent. d\ homologue of the " caudal spine " of 

 Sphingidaj. d, a seta enlarged. 



Stage II. — Length 8 mm. The body is now longer in 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 2d 

 and 3d thoracic, and the 1st, 8th, and 9th abdominal segments, are 

 slightly, but not very noticeably, larger than before. The larva 

 differs markedly from that of C. promethea of this stage in the 

 faint, narrow transverse stripes, those of G. 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 G. promethea. 

 The body is greenish yellow, while the ground color of G. promethea 

 is more of a whitish hue. Only the two last abdominal tubercles (on 

 10th segment) are dusky. (The figures of Mr. Bridgliam agree with 

 Miss Soule's description.) 



Stage II. — 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 pale straw yellow, more 

 distinctly banded with black than before, the two heaviest and broad- 

 est bands being on the hinder edges of the prothoracic and the 8th 

 and 9th abdominal segments, while the suranal plate is blacker than 

 before, with a lateral black line. On the other segments, the black 

 bands (two to each segment) are confined to the back, and do not 

 extend down the sides. All the tubercles from the 2d thoracic to 

 and including the 9th abdominal ones are yellowish. 



At the end of this stage, length 18 mm. The body is rather thicker 



