70 PROCEEDINGS OF THE AMERICAN ACADEMY 



The Life History op Callosamia angulifera (Walk.), 



The larvfE hatched on July 6 and 7 from eggs kindly sent me by 

 Miss Morton, and fed on the leaves of the tulip tree, Stages II. to 

 IV., are described from Mr. Bridgham's colored figures. Miss Caro- 

 line G. Soule describes the five stages in Psyche, Vol. V. p. 260. 



Egg. — Of the same shape and color as those of C promethca, 

 though slightly smaller, while the polygonal markings appear to be 

 even fainter than in C promethea. 



Freshly hatched Larva. — Length 4 mm. The head is black, with 

 two lunate ochreous yellow spots on the vertex, while in front, on the 

 middle, is a transverse, pale parchment-colored stripe, and in front of 

 this stripe is a transverse clypeal line of the same pale hue. The 

 body is pale 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 larvos 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 (7. prome^/^ea, being much narrower, 

 very much fainter, and often nearly obsolete ; also all the tubercles 

 and hairs, except those on the prothoracic and sometimes the 10th 

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

 and setae on the prothoracic segment are not so dark as in C. promethea. 

 The upper pale stripe on the head is a little narrower than in C. pro- 

 methea. The black stripes on the last three abdominal segments are 

 somewhat heavier than those in front. The tubercles on the 9th ab- 

 dominal segment and the end of the anal or 10th segment may be 

 dusky, while the dark stripes on the segments in front may be entirely 

 wanting. 



There is little difficulty in separating the larvge of the two species 

 at the first stage. It is noteworthy that the colors of the dorsal tuber- 

 cles are not so much differentiated as in C. promethea, or they are in 

 a degenerate stage; the dorsal tubercles of the 2d and 3d and the 1st 

 and 7th to 9th abdominal segments are not dark, as in C. promethea, 

 but like those on segments 2-6. The dorsal tubercles are a little slen- 

 derer, and the seta3 or hairs rather longer, than in O. promethea. The 

 tubercles have the same number of sette as in O. promethea, the single 

 one on the 8th abdominal segment having ten seta3, and being distinctly 



