SESIA. 149 



Mature Larva. Pale pea-green, reddish beneath, with a dark 

 green dorsal line, a pale yellow stiginated stripe. 

 Canada; Northern and Southern United States. 



CLEMENS. 



2. S. thysbe Fab. S. pelasgus Cramer. S. cimbiciformis Stepli. I. S. 

 nificaudis Kirby, Walker. Figured in Cram. pi. 248.' 



Head, palpi above and thorax dark green, mixed with brown ; 

 palpi on the sides blackish, beneath of a light cream color ; the 

 breast and legs, except the tibiae of the hind pair, which are brown- 

 ish, have the same yellowish-white hue. The eyes are slightly 

 encircled with white scales. The two basal segments of the abdo- 

 men above are yellowish-brown ; the two middle are deep ferru- 

 ginous or reddish-brown, and the terminal have small ferruginous 

 patches in the middle, the rest of each being a dull, yellowish- 

 brown. The ventral surface is bright ferruginous, with three or 

 four small yellowish tufts between the segments on the line sepa- 

 rating the dorsal and ventral surfaces ; the lateral anal tufts are 

 black, the central reddish-brown and ferruginous beneath. The 

 anterior wings, the basilar space, especially towards the inner mar- 

 gin, is ferruginous, and olivaceous toward the base of costa; the 

 disk is divided by a dark brown line; the costa is dark brown and 

 the broad terminal band has the same hue, with a ferruginous patch 

 in the apical interspace. The posterior wings have a bright ferru- 



1 S. ruficaudis of Kirby. "Body yellow olive, underneath pale yellow. 

 Antennje black ; fore wings reddish-brown, hyaline in the disk, with the 

 hyaline part half divided towards thie base, with a costal bar ; covered with 

 yellow olive hairs at the base underneath the costa, the posterior margin 

 and the nervures are dark ferruginous ; there is also a yellow stripe on the 

 inner side of the base ; hind wings hyaline in the disk, base externally 

 and costa yellow ; internally the base is ferruginous ; underneath the dark 

 part of the wings is ferruginous and the base pale yellow ; two first seg- 

 ments of the abdomen yellow olive, two next black, the rest ferruginous, 

 with pale yellow lateral spots." 



S. ruficaudis of Walker. Fawn-color. Head whitish about the antenme 

 and beneath, with a brown band in front. Pectus testaceous. Abdomen 

 deep red, fawn-color at the base, with testaceous spots along each side ; 

 hind borders of segments black; apical tuft red, with some black hairs on 

 each side. Wings limpid, deep red at the base, and with broad deep red 

 borders. Fore wings deep red at the tips and with a blackish discal streak. 

 Length of the body 9 12 lines ; of the wings 18 24 lines. 



