LARV-E OF MOTHS FROM COLORADO— DYAR. 395 



low, collared, dorsal humps; anal plate rounded, smooth, small; no 

 shields. Feet moderate, equal, the anal pair a little smaller, but used 

 in walking-. Dorsum shaded in vinous brown mixed with gra^yish, 

 only a trace of g-reen in the incisures dorsally ; venter narrowly g-reen. 

 Thoracic feet red-brown, the foot of joint 7 and the others in a less 

 degree with a purple brown streak outwardly. Humps nai-rowly pale 

 gray, spotted and streaked in purplish black. Tubercles whitish with 

 black hair dots, a little deviated, distinct, normal. Spiracles large, 

 white, black rimmed. The dark mark on the hump of joint 6 is an 

 irregular black band from behind the spiracle over the dorsum and an 

 elongate spot between tubercles i and iii. Joints 2 to 5 are more red- 

 dish than 6 to 13, having no gray; the hump of joint 12 is reddish and 

 the gray consists of traces of the collar markings of joints 7 to 11, 

 most distinct at the spiracles. Later joints 2 to 6 are a little smaller 

 in diameter than the rest of the body, joint 2 slightly widened and 

 pale on the sides. The body becomes all lilaceous except narrowly 

 ventrally with the same marks, but no distinctly different reddish 

 tints. Anal plate with a narrow red rim. 



Larv» found on aspen at Bailey's in the Platte Canyon, mixed with 

 P/ieosi'a dmiuliata, which they greatly resembled in the egg stage. A 

 larva entered the earth to pupate July ol, and the moth emerged 

 May 6 the following season. 



In the last stage the larva rests on the twigs of its food plant, which 

 it closely mimics in shape and color. 



Family COCHLIDIID^. 



TORTRICIDIA TESTACEA Packard, variety CRYPTA Dyar. 



I had no expectation of finding a slug caterpillar in Colorado, as the 

 climate seems too dry. However, Mr. Caudell netted a female moth 

 in a narrow, wooded gulch leading ofi' from the Platte Canyon, not far 

 below Bear Gulch. The moth differs only slightly from the Eastern 

 Tortricidia testacea^ being paler and less strongly dark shaded, but the 

 larva shows some rather unexpected differences, showing it to be a 

 distinct local variety of that species. The pattern of markings is more 

 generalized in the Rocky Mountain race. 



J^^ggs. — Elliptical, flat, but rather thick and arched, translucent, 

 slightly yellowish, the reticulations obscure; size, 0.8 by 0.5 mm., all 

 as usual in the family. 



Stage /. — As in the Eastern species, the subdorsal spines Y-shaped, 

 the anterior prong shortened on the hinder segments, especially on 

 joint 11; not strongly alternating, yet perceptibly so; greenish trans- 

 lucent, the ridges whitish; head green, eye black, mouth brown; skin 

 smooth. All normal, no markings. 



