1893.] lt)l [Packard. 



very short, not so high as broad, and end in a group of rounded conical 

 spinules ; those on the side of the same segment having the same general 

 shape. 77te second and third tlioracic segments, with the dorsal horns, now 

 much as in the full-grown larva, though a little slenderer ; length, 5 mm.; 

 they are more curved than before and directed backwards and provided 

 with numerous dense conical tubercles ; they are pale yellowish at base, 

 and rosy on the distal half, becoming black at the tip, which is still regu- 

 larly forked ; the two pairs are of the same shape and length. The ab- 

 dominal dorsal spines are much stouter and shorter in proportion than in 

 Stage III. The subdorsal (supraspiracular) spines are simple, conical ; 

 tlie lateral (infraspiracular) spines are very short, and composed of four 

 spines, llie "caudal spine " (single median dorsal spines on eighth abdom- 

 inal segment) is noio much stouter, more conical than before ; 2.5 mm. in 

 length and furnished with crowded spines, but still ending in a regular 

 fork. The suranal plate is as before, but the spines are shorter, and the 

 exterior of the anal legs are ornamented as before. 



The hairs are now long and abundant, some of the dorsal ones longer 

 than the body is thick. The spiracles 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 umberbrown ; 

 the reddish spines and the spiracles, as well as the reddish edges of the 

 suranal plate and anal legs, decidedly contrasting with the dark hue 

 of the body. The color of the spiracles varies in different individuals, 

 being 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 horns, those on the sides also being decidedly shorter, and the anal 

 legs are larger, with a wider dark granulated area on the sides, and the 

 body is mucli thicker and heavier, while the head is pale. 



Last {Fifth) Stage. — Length, 10 cent. (Described from 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 cl3^peus. The front division of 

 the clypeus (clypeus anterior), the antennae, and tie base 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, i. e., 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 tawny), varying from the shade of the upper 

 side of the cherry leaf to that of the under side, being paler above along 

 the back 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 green hue as the body, 

 but with yellowish edges. Of the four horns on the second thoracic seg- 



