66 



CEREAL AND FORAGE INSECTS. 



represents the prespiracular tubercle; a single seta on a spine subventrally. Anal 

 plate black, with setae but no spines. There are no secondary hairs and no markings. 

 Stage II (fig. 34). — Head rounded, black, with white setae; width about 1.2 mm. 

 Body subcylindrical, uniform dark brown, with a number of small whitish secondary 

 dots from which arise small pale hairs. Thoracic feet moderate, the abdominal ones 

 equal, tapered, with thick bases, the anal pair with large triangular plates. Spines 



Fig. 34.— The New Mexico range caterpillar: Larva, second stage. Greatly enlarged. (Original.) 



rather short, all about the same length, situated in the positions of the spines of the 

 first stage, each with several short branches or notches bearing fine setae ; the sub- 

 dorsal spines on joints 3 and 4 have several of these branches modified into quills 

 with short sharp points, which are the urticating spines. They are developed in this 

 stage only on the subdorsal spines of joints 3 and 4 (mesothorax and metathorax), and 

 only three on each spine. 



Stage III (fig. 35). — Head rounded, higher than wide, smooth, shining reddish- 

 black; setae coarse, white, a few secondary ones near the ocelli; width about 1.8 mm. 



Fig. 35.— The New Mexico range caterpillar: Larva, third stage. Greatly enlarged. (Original.) 



Body subcylindrical, uniform; feet equal, the anal pair with large triangular plates, 

 all the leg-plates setose. Skin brown, with a number of secondary pale-yellow gran- 

 ules bearing whitish hairs. A faint yellowish subdorsal line in which the granules 

 are denser than elsewhere. Subdorsal spines of joints 3 and 4 short and dense, the 

 others slender with sparse branches. The sparse branches bear setae, the short dense 

 ones have short pointed tips, and are the urticating spines. Spines and spinules 

 mostly black. 



Stage IF (fig. 36). — Head rounded, higher than wide, flat in front, clypeus small; 

 smooth, shining, black or blackish red. Hairs coarse, white, a number of secondary 



Fig. 36.— The New Mexico range caterpillar: Larva, fourth stage. Much enlarged. (Original.) 



ones about the region of the ocelli; mouth-parts and antennae black. Width about 3.5 

 mm. Body cylindrical, equal, normal, the feet equal, the crochets of the abdominal 

 feet long, in a line. Yellowish, shaded with blackish the secondary hairs arising 

 from large, yellow, flattened granules, so numerous as to cause the general yellow 

 appearance; a faint, geminate, dorsal, more distinct subdorsal, narrow lateral, and 



