MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 135 



The thoracic legs are Llack, and at tlie end near the chiw are two tenant hairs wiiicli aic hmg- 

 and large, curved backward and somewhat knife shaped. The abdominal logs have a black 

 chitinous scale on the outside above the ])lanta. These are at first crotchets. 



The general color of the body is deejt straw-yellow, with a greenish tinge and a waxy 

 appearance or gloss on the skin, while the obscurely marked stripes are reddish. 



Staiie II. — Length, 5-G mm. (August 18-120). Now the generic and part of the s])ecilic 

 ■characters are assumed, the species in this stage being- easily distinguishable from the others of 

 the genus. The larva- feed socially on the underside of the leaves, iu confinement hiding between 

 the leaves iu the breeding box. 



The head is black, as wide as the body. The prothoracic shield is pitch-hhuk, and now is 

 divided by a pale median line. The 1)ody is bright yellowish green. There are three dorsal dark 

 l)ro\v;i lines, the median less broken than the others. The three lateral lines are uow distinct, the 

 middle one being one half as wide as the others, the two others bearing the larger subdorsal and 

 lateral tubercles, respectively. The situation and lelative proportion in size of the tubercles 

 (which are dark) are as described in Stage I; the two large twin dorsal pairs on abdominal seg- 

 nienis 1 and S are larger, higher, and more distinct than before, and each bears about four or five 

 stiff, dark bristles of unequal size and length. The suranal plate is blackish. The hairs are uow 

 slender, pale or dull whitish, tapering, and in general about as long as the body is thick. The 

 legs as before, but the abdonunal ones with a larger and rather more distinct s(piarish chitinous 

 patch above the plauta. (Described soon after molting). 



Stncjc III. — (Described August 29, immediately after molting). Length, 1- mm. The head is 

 uow not so wide as the body, black. The prothoracic shield is distinctly divided. Body bright, 

 glistening, yellowish green, with three uarrow dorsal black lines, the median one less broken than 

 the others. These are succeeded by a broad difluse subdorsal, almost double black stripe, on 

 which a black piliferous wart is situated, one for each segment. Below is a similar wart, 

 including a broad line, and above and below this is a tine black brown, somewhat bi'oken line: the 

 lower one is the spiracular line, the dark spiracles being minute and interrupting the line, so that 

 there are four instead of thi-ee lateral lines in this stage, the additional line being the lowest or 

 spiracular one. 



The two large twin tubercles on the first and eighth abdominal segments arise from a common 

 fleshy humi), that on the eighth segment being slightly the smaller of the two pairs. Each bears 

 .six to seven black hairs. The hairs are in general sordid white, and are not so long as the body is 

 thick. The suranal plate is large, black, and the anal legs are nearly all black on the sides. 



Ih'capitulation. — (Corrected from that published in Proc. Bost. Soc. xxiv, r>17.) 



1. In Stage I the two median dorsal tubercles on the first and eighth abdonunal segments are 

 larger than thp homologous ones on the second to seventh abdominal segments, and each pair is 

 situated on a brown raised ground. 



2. The i)rothoracic shield is undivided; in Stage II it begins to be divided, becoming sei)arate 

 in the last stages. 



;3. Toward the end of Stage I the three lateral lines are faintly indicated. 



4. The hairs in Stage I are glandular and slightly bulbous. 



."). The tubercles iu Stage I all give rise to but a single hair. 



0. The three dorsal dark reddish lines appear at the end of Stage II. 



7. The spiracular line appears iu Stage III. 



Coioon. — The eateri)illar. living during the last stages iu a rude cocoon or tent s])nu betweeii 

 two leaves, or within a foliled leaf, transforms within it, the cocoon being a loose web with 

 aliun<laiit brown silken strands. 



I'upn. — Large and thick; wings not reaching to the hinder edge of the third abdominal 

 segment; .abdomen unusually full and rounded at the end; the two last segments smooth and 

 polished, scarcely pitted; the terminal spine (cremaster) forming a slender rounded .spine scarcely 

 thicker at the end than at the base, and terminating in two broad, stout, suddenly upcurved 

 flattened hooks, with a broad shaip edge sending off thi((> ov tour long, slender seta-, which are 

 entangled iu the silk strands of the cncoon. Length, 17 to l.S mm. (Fig. 60). 



