566 PROCEEDINGS OF THE AMERICAN ACADEMY. 



being of uniform height. There are hairs on the supraspiracular 

 tubercles. 



At the end of this stage (April 16-17) the larvae became 8-12 mm. 

 in length, though the head is no larger than at first. 



The body is livid brown-black, but paler on the under side, almost 

 glaucous-green, with a yellowish tinge, so that the lateral or pleural 

 fleshy ridge becomes a faint greenish-yelloio line. The tubercles are 

 jet-black, and the hairs black, with gray ones intermixed. 



Other examples before moulting have a pale dull whitish band extend- 

 ing across the labral region of the head, and a lateral row of livid pale 

 whitish spots. 



Stage II. Moulted April 16-17. Length of body 11-12 mm., width 

 of head 1 mm., about twice as great as before. Directly after moulting 

 the head, legs, and tubercles are all white. The lateral broken line 

 or series of pale greenish-yellow lateral linear spots is 7nuch more dis- 

 tinct than before, being now conspicuous, while the body is dull livid 

 blackish. Now there are scattered over the body long white hairs., and 

 similar ones form the central one or two setae in each tubercle ; they 

 are about one-third as long as the whole body, but in the lateral or 

 infraspiracular row of tubercles all the radiating hairs are long and 

 whitish. The white hairs are most abundant on the prothoracic plate 

 and head. The short hairs on the body are still black. Under side of 

 the body livid. 



Stage III. Moulted the second time May 1. Length 24 mm.; head 

 larger, width 2.5 mm. 



The most decided change is in the prothoracic hairs and those on the 

 sides of the body, which are straw-yellow, while the anal legs are edged 

 with straw -yellow. The longest dorsal hairs are about a quarter to a 

 third as long as the entire body. The body is still rather long and 

 slender, and much more hairy than in the larva of Antheraea. The 

 tubercles are still more prominent, black, the ends and the tuberculets 

 livid. The hairs are long, not stiff, but a little crinkled, and they 

 partially conceal the tubercles. The latter are still all of the same size. 



Stage IV. Third moult occurred May 17-20. 



Length of body 22 mm. ; width of head 3 mm. 



There is now a decided chauire in coloration and markings. The head 

 is nearly as wide as the body, black, the cl3'peus-anterior white ; labrum 

 yellowish ; the head armed with long uneven yellow hairs. 



The body is still only moderately thick, and is long and slender, not 

 at all like Antheraea in shape ; the segments are not convex, but Hat, 



