124 MEMOIRS OP^ THE NATIONAL ACADEiNIY OF SCIENCES. 



more eiir\'od tliaii before and direeted Ijaekward and provicled with numerous dense conical tulier- 

 cles; tliey are pale yellowish at l>ase, and ros}' on the distal half, beeoming black at the? tip, which 

 is still regularly forked: the tw'o pairs are of the same shape and length. The atidouiinal dorsal 

 spines are much stouter and shorter in proportion than in stage III. The subdorsal (supraspi- 

 racular) spines are simple, conical: the lateral (infraspiracular) spines are very short, and com- 

 posed of four spines. The ''caudal sjjine'''' (single median dorsal spine on eighth abdominal 

 segment) !s now much stouter, more conical than hefore; 'l.h nun. in length and furnished with 

 crowded spines, but still ending in a regular fork. The suranal plate is as before. l)ut the spines 

 are shorter, and the exterior of the anal legs are ornamented as before. 



The hairs are now long and ahundant, some of the dorsal ones longer than the body is thick. 

 The s])iracles are very conspicuous, each being surrounded by a broad green ring, outside of 

 which is a yellowish ring, which is margined with yellowish brown. The body is dark umber- 

 l)rown: the reddish spines and the spiracles, as well as the reddish edges of the suranal plate and 

 anal l(>gs. decidedly contrasting with the dark hue of the body. The color of the spiracles varies 

 in dirt'erent individuals. I)eing sometimes mostly white or green or red. Also the yellow color 

 around it is sometimes large and of different width, sometimes being reduced to a line. 



The last stage differs from stage IV in the shorter dorsal horns and caudal horn, those on 

 the sides also being decidedly shorter, and the anal legs are largei', with a wider dark granulated 

 area on the sides, and the body is much thicker and heavier, while the head is pale. 



Lad ijifth) stage. — Length, 10 cent. (Described fi-om one living on the choke cherry.) 

 Head one-half as wide as the body; width, 7 mm.; deep gamboge-yellow, and green on the side; 

 a double, deep-black frontal line extending from the vertex, diverging below so as to leave a 

 median yellowish line on the upper division of the clypeus. The front division of the ch'peus 

 (clypeus anterior), the antennse, and the l)ase of the jaws yellowish. The thoracic legs and the 

 horns on the second and third thoracic segments and the anal legs with the suranal plate are all 

 of the same color, /. c. deep shining gamboge-yellow. The general color of the body in the 

 green individuals is a delicate pea-green (more usually the individuals are brown or tawney), 

 varying from the shade of the upper side of the cherry leaf to that of the under side, being paler 

 above along the l)ack and especially on the sutures than on the sides. The hairs are long and 

 slender and whitish, most of the dorsal ones as long as the body is thick. There is a prothoracic 

 plate of the same gi'een hue as the body, but with yellowish edges. Of the four horns on the 

 second thoracic segment, the outer ones are half as long as the inner or dorsal ones, which are 

 4.5 mm. in length; those of the third thoracic segment are of the same size as those on the 

 second. There aic four similar but much smaller dorsal and subdorsal horns on each of the 

 abdominal segments (lint tlicy are shorter and more regularly conical than in stage IV), those 

 on each .segment being of the same size, the two dorsal one."; being almost three times as large as 

 the subdorsal ones, each dor.sal one bearing three terminal spines. Those on the thoracic seg- 

 ments are tuberculated. ending in a fork. On the eighth abdominal segment is a median dorsal 

 horn, now shorter in proportion than in stage IV, small and short, length 2 mm., nearly twice 

 as large as the other dorsal ones in front. tnbiM-culated and slightly forked at the end, but not 

 .so regularly forked as in stage W. There is a minute median one on the ninth segment, and 

 two minute lateral ones on each side of the segment. The spiracles are very large and conspicuous, 

 yellow with an outer ring of vei'v dark green, uhieh is edged on each side with paler green; 

 those on the juothorac-ic segment are without the deep green outer ring. The suranal plate is 

 regularlv triangular. gaml)oge-yellow. with a swollen, rough, coarsely granulated edge, within 

 which the surface is black, with yellow coarse graiudations. A similar narrow triangular plate 

 on the anal legs. The middle abdominiU legs dark pea-green, w itli a deej) ocher-yellow tranverse 

 band above the black planta. 



For a careful description of the egg and the larva in its tirst four stages see Dr. J. A. 

 Lintner's Ent. Contr., II. l-")<». His larva> molted four times, and he tlidiight from the small size 

 of the specimens after the fouitli molt that there might be a fifth one. 



The lifth and last stau'e ditl'ers from stau'c IV in the shorter dorsal horns and caudal horn; 



