MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 105 



tubercles iuv Imio- und slomler, lomuled ;it the tip, and porcelain white. The two spines at the 

 end of the siinmal plate are tipped with l)lack. this plate and the anal legs be'tny paler than the 

 bodv. Tiie horns on the second thoracic seynient are now shorter than liefore, or as long as the 

 third tlioracic and tirst abdominal segments taken together. They are. however, longer than in 

 the la><t (tit'th) stage, with longer spimdes, and end in two diverging spinules. The other .spines 

 are as before, those on abdominal segments -±-8 being larger than those on the three segments in 

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

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

 greenish, much as in the tifth 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 behind 

 forward. 



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

 stage of ^1. .stigma. What corresponds to the three dorsal lines of the second stage of ^i. stigma 

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

 spiracular) are still distinct. 



The white granulations are, on the back above the spiracles, transversely oval, and arranged 

 in transverse sei'ies. but below the spiracles they are round and show a disposition to be arranged 

 longitudinally. 



Stage Va/id last. — Length, 55 inm. Head greenish yellow or green in life, in the blown 

 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 body, 

 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 diti'er 

 in shape (PI. L, fig. \c): the tip is bulbous, smooth, and destitute of the two terminal .setfe present 

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

 Stage IV. The horns vary in thickness (PI. L, fig. Ic, \<T). 



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

 the thickness of the horns at base; they 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, those 

 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 amt)er. and bearing two stout black conical spines, one on each side, 

 and not quite halfway from the base 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. IJ, If). 

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



Anal legs of the same color as the suranal plate, with white tubercles on the edge around the 

 central area. The body is greenish on a grayish parchment-colored ground, scattered over 

 rather densely with white granulations, which have a central pit. and in some cases a vestigial 

 seta. The amount of green varies. 



From the prothoracic to the ninth abdominal segment two In'oad distinct deep pink stripes; 

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

 the lower between the .spiracles, nearly touching them, the spines of the infraspiracular series 

 being situated in the middle of the pink stripe. The amount of pink in these bands varies. 



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

 above the plate. 



The full-fed larva diflei-s from that of A. stigma, with which it is liable to be confounded, in 

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



