MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 105 



tubeirles are long- and blender, rounded at the tip, and porcelain white. The two spine.s at the 

 end of the siiranal plate are tipped with black, this plate and the anal leg's being paler than the 

 body. The horns on the second thoracic seg^inent are now shorter than before, or as long as the 

 third thoracic and first al)doniinal segments taken together. They are. however, longer than in 

 the last (fifth) stage, with longer spinules, and end in two diverging spinules. The other spines 

 ai-e as before, those on aljdominal segments 4-8 being larger than those on the three segments in 

 front. The two pink lines are now more distinct from above as well as from the side; the pro- 

 thoracic plate is still l)lackish-brown. The legs, both thoracic and abdominal, are now pale 

 greenish, much as in the fifth and last stage. 



In one larva of Stage III the lateral pink line is only present on the abdominal segments, 

 suggesting that the lines originate at the end of the body and become developed from ))ehind 

 forward. 



In this (third) stage the dark stripes are more distinct and definite than in the corresponding- 

 stage of A. sttgina. What corresponds to the three dorsal lines of the second stage of ^1. vtiyma 

 are already blended into a broad dark dorsal band. The two lateral lines (spiracular and supra- 

 spiracular) are still distinct. 



The white granulations are, on the ))ack above the spiracles, transvei'sely oval, and arranged 

 in transverse series, but below the spiracles they are I'ound and show a disposition to be airanged 

 longitudinally. 



Stage V and Ii>sf. — Length, 55 mm. Head greenisii yellow or green in life, in the l)lo\vn 

 example pale sienna brown, or yellowish chestnut; three-fourths as wide as the body where thickest. 

 The prothoracic plate is now not black as in Stage IV, but concolorous with the rest of the bodv, 

 and bearing near the front edge four dark flattened tubercles. 



The two horns on the second thoracic segment are now shorter than in Stage IV, and ditt'er 

 in shape (PI. L, flg. If); the tip is bulbous, smooth, and destitute of the two terminal seta; present 

 in the previous stages; the spinules on the trunk are short and blunt comjjared with those in 

 Stage IV. Tiie horns vary in thickness (PI. L, tig. Ir, 1^;'). 



The two dorsal spines on the third thoracic segment are short, wlien longest no longer than 

 the thickness of the horns at base; the3^ are about three times as long as thick at the base, and are 

 bifid at the tip, each fork ending in a short stout seta. The two dorsal spines on the first abdom- 

 inal segment are minute, shorter than those on the second abdominal segment; the latter are a 

 little longer, simple, and the corresponding spines increase in length to the ninth segment, tho.se 

 on the eighth and ninth segments being the longest; those of the infraspiracular series on the 

 eighth and ninth segments are bifid. 



The suranal plate pale dull amber, and bearing two stout i>lack conical spines, one on each side, 

 and not (juite halfwa}' from the tmse to the end of the plate; smaller tubercles are scattered over 

 the surface, but are larger at the edge of the plate. The plate ends in two slightly diverging 

 large conical tubercles, about twice as long as thick at the base, and twice as long as any others 

 on the plate, and bearing on the sides three or four setiferous tubercles (PI. LII, figs. Ih. ]<■). 

 Compared with those of ^1. stigma, these two terminal tubercles are larger. 



Anal legs of the same color as the suranal plate, with wiiite tu))ercl(>s on the edge around the 

 central ai'ca. The liody is greenish on a grayish parchment-coloied ground, scattered over 

 rather denselv with white granulations, which have a central pit. and in some eases a vestigial 

 seta. 'IMie amount of gnu'n varies. 



From the prothoracic to the ninth abdominal segment two broail distinct deep pink stripes; 

 the upper or subdorsal one situated on the subdorsal row and supraspiracular row of spines, 

 the lower between the spii-acles. neiii-Iy touching them, the spines of the infraspiracular series 

 being situateil in the middle nf thr pink stri|)c. The aniouiit of i)iiik in these bauds varies. 



The thoracic legs pale; those of the mid abdomen p;ile. with a dark spot on the outside 

 above the plate. 



The full-fed lar\-a ditlcrs fi-oni that of .1. sfigimi. with which it is liable to be confounded, in 

 the shorter spines. (.See the figures of structural details in Plates L. LII.) 



