MEMOIRS OF THE NATIONAL ACADEMY OF SCIEXCES. 135 



The tlioracic legs are black, and at the end near the claw are two tenant hairs which are long 

 and large, cnrved backward and somewhat knife shaped. The abdominal legs have a black 

 •chitinous scale on the outside above the planta. These are at tirst crotchets. 



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

 appearance or gloss on the skin, while the obscurely marked strii^es are reddish. 



8ta<je II. — Length, 5-0 mm. (August 18-20). Xow the generic and part of the specific 

 chairuters are assumed, the species in this stage being easily distinguishiil)le from the others of 

 the genus. The larviB feed socially on the underside of the leaves, in coutinement hiding between 

 the leaves in the breeding box. 



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

 divided by a pale median line. The body is bright yellowish green. There are tlaee dorsal dark 

 brown lines, the median less broken than the others. The three lateral lines are now distinct, (he 

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

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

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

 menis 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 suraual plate is blackish. The hairs are now 

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

 legs as before, but the abdominal ones Mith a larger and rather more distinct squarish chitinous 

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



»SY«(76' III. — (Described August 29, immediately after molting). Length, 12 mm. The head is 

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

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

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

 whicli 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 fine blaclc-brown, somewhat broken line; the 

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

 there are lour instead of three lateral lines in this stage, the additicmal line being the lowest or 

 spiracular one. 



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

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

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

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



Itccapitulation. — (Corrected from that published in Proc. Bost. Soc, xxiv, 517.) 



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

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

 situated on a brown raised ground. 



2. The iirothoracic shield is undivided: in Stage II it begins to be divided, becoming separate 

 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. 



5. The tubercles in Stage I all give rise to but a single hair. 



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



7. Tlie spiracular line appears in Stage III. 



Cocoon. — The caterpillar, living during the last stages in a rude cocoon or tent spun between 

 two leaves, or within a folded leaf, transforms within it, the cocoon being a loose web witli 

 abundant brown silken strands. 



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

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

 polished, scarcely i)itted; 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 sharp edge sending off three or four long, slender setiv, which are 

 entangled in the silk strands of the cocoon. Length, 17 to 18 mm. (Fig. 00). 



