MEMOIRS OF THE iTATIONAL ACADEMY OF SCIEi^CES. 
135 
The tlioradc legs are black, and at the end near the claM' are two tenant hairs which are long 
and large, curved backward and somewhat knife- shaped. The abdominal legs have a black 
•chitinous scale on the outside above the planta. These are at first 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 stripes are reddish. 
Stafje IT. — Length, o-O nun, (xVugnst 18-20), Yow the generic and ]tart of the specific 
characters are assumed, the sxiecies in this stage being easily distinguishable from the others of 
the genus. The larvic feed socially on the underside of the leaves, in confinement hiding between 
the leaves in the breeding box. 
The head is black, as wide as the body. The prothoracic shield is pitch-black, and now is 
divided by a i>ale median line. Tlie body is bright yellowish green. There are three dorsal dark 
brown lines, the juedian less broken than the others. The three lateral lines are now distinct, the 
middle one being one half as wide as the others, the two others bearing the larger subdorsal and 
lateral tubercles, respectiv^ely. The situati<»u and relative proportion in size of the tubercles 
(which are dark) are as described in Stage 1; the two large twin dorsal xiaii's on abdominal seg- 
ments 1 and 8 are larger, higher, and more distinct than before, and each bears about fotir or five 
stiff, dark bristles of une(|ual size and length. Tlie suranal 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 with a larger and rather more distinct squarish chitinons 
l)atch above the idanta. (Described soon after molting). 
Stage ITT . — (Described Angnst 29, immediately after molting). Length, 12 min. The head is 
now not so wide as the body, black. The piuthoracic 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 diffuse snbdorsal, almost double black strii»e, on 
which a black iiiliferous wart is situated, one for each segment. Below is a similar wart, 
including abroad line, and above and below' this is a fine black-brown, somewhat broken line; the 
lower one is the spiracnhir line, the dark siiiracles being minute and iuterrux>ting the line, so that 
there ai-c four instead of three 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 hump, that on the eighth segment being slightly the smaller of the two x>airs. Each bears 
six to seven black hairs. The hairs are in general sordid while, and are not so long as the body is 
thick. The suranal phite is large, black, and the anal legs are nearly all black on the sides. 
Recapitulation, — (Corrected from that x^nblished 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 tlie homologous ones on the second to seventh abdominal segments, and each i)air is 
situated on a brown raised ground. 
2. The i)rothoracic shield is undivided; in Stage II it begins to be divided, becoming sex^arate 
in the last stages. 
3. Tow ard the end of Stage I the three lateral lines are faintly indicated. 
4. Tlie hairs in Stage I are glandular and slightly bulboirs. 
5. The tubercles in Stage I all give rise to but a single hair. 
(J. The three dorsal dark reddish lines ax^pcar at the end of Stage II. 
7. The siiiracular lino aiipears in Stage III. 
Cocoon , — Tlie caterpillar, living during the last stages in a rude cocoon or tent spun between 
two leaves, or within a folded leaf, transforms witliin it, the cocoon being a loose web with 
abundant brown silken strands. 
Pupa . — Large anil thick; w'ings 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 jiitted; the terminal sx)ine (cremaster) forming a slender rounded sxiine scarcely 
thicker at the end than at the base, and terminating in two broad, stout, suddenly ux)curved 
flattened hooks, with a broad sharp edge sending off tliree or four long, slender seta;, which are 
entangled in the silk strands of the cocoon. Length, 17 to IS min. (Fig. 00). 
