123] LEPIDOPTEROUS LARVAE — FRACKER 123 



cc. Prothorax bearing rudimentary scoli ; abdominal seoli broad at 

 base, pointed, smooth, 

 d. Scoli of abdominal segments 1, 3, and 5 one fourth as long as 

 those of 2, 4, and 6 ; those of segment 9 abortive. 



Adelocephala 



dd. Seoli of abdominal segments 1 to 6 uniform in size ; those of 



segment 9 conspicuous. Syssphinx 



bb. Eighth abdominal segment without a scolus on the dorsomeson 



(Fig. 111). Anisota 



Philosamia cynthia is the only American species of its genus. The 

 caterpillars have a creamy appearance owing to a powdery bloom which 

 somewhat obscures the blue scoli. 



Rothschildia jorulla was studied but R. orizaba has not been seen. 



Tropea luna, when the caterpillar is fully grown, is of a clear 

 green color on both its head and body. On the caudal margin of each ab- 

 dominal segment there is a transverse yellow line and another on either 

 side of the body below the spiracles. The scoli are reddish in color 

 and rather small in size. 



Tclea polyphemus is very similar to Tropea luna except in the 

 characters given in the key. 



Samia cecropia was the only one of the North American species of 

 this genus examined. The enlarged dorsal scoli of the mesothorax, meta- 

 thorax, and first abdominal segment distinguish this species from all 

 other members of the family. 



Callosamia. Two species of this genus occur in the eastern states 

 and one (C. calleta) in the southwest, Mexico and Arizona. They may 

 be distinguished as follows: 



a. Scoli of first eight abdominal segments reduced or absent in last 



larval instars. 



b. Abdomen bearing a distinct longitudinal subspiracular yellow 



ridge. C. angulifera 



bb. Abdomen not bearing a subspiracular ridge. C. promethca 



aa. Scoli of first eight abdominal segments conspicuous, those of first 



segment largest; body marked with black, base of scoli red. 



C. calleta 



Agapema anona is a conspicuously marked yellow and black species 

 with a black head. A. galbina has not been seen. 



The three species of Saturnia examined (pavonia-major, pavonia- 

 minor, and spini) are all exotic. The larva of S. mendocino seems not 

 to be known at the present time. 



Hemileuca. In both this genus and Pseudohazis the scoli alpha of 



