780 ZOOLOGY INSECTS. 



THECLA IROIDES, Boisd. 

 Thecla Iroides, MORRIS, Syn. Am. Lep., 100. 



The Colorado specimens of this species differ a little from the usual 

 California!! types. In the male, the stigma upon primaries is longer and more 

 sharply pointed. 



Both sexes have scarcely any lobe at the anal angle of secondaries. 

 The under surface is usually suffused with vinous ; and the anal third of 

 secondaries is densely powdered with gray scales. The fringe is dark- 

 brown, except between the nervures, where its inner half is gray. 



The species may be found toward the last of May and early in June 

 among the foot hills of the Rocky Mountains, at above 7,000 feet elevation, 

 usually flying by the road side or alighting upon damp spots. 



THECLA ERYPHON, Boisd. 

 Thecla Eryphon, MORRIS, Syn. Am. Lep., 100. 



A few specimens were taken early in June in Colorado, associated with 



T. Iroides. 



CHRYSOPHANUS, Hubner. 



CHRYSOPHANUS HELLOIDES, Boisd. 

 Polyommatus Hclloides, MORRIS, Syn. Am. Lep., 86. 



This species was brought by the expedition from Southern Utah. It is 

 moderately abundant in all parts of Colorado; being found on the plains as 

 well as near the summits of the highest peaks, and may be found from the 

 first of June to the last of August. 



In the South Park, and also near Turkey Creek Junction, a number of 

 caterpillars were found, probably of this species. When full grown, they 

 measured three-fourths of an inch in length. In shape, they were onisciform. 

 The head is brownish, entirely retractile within the first segment, Body 

 grass-green, covered with a slight reddish down. Young larva with a red- 

 dish-brown dorsal stripe. It feeds upon the Yellow Dock (Eumex). Those 

 taken in the South Park were hidden on the surface of the ground under 

 leaves or sticks, but the others were on plants growing in cultivated ground. 

 During the day, these latter buried themselves to a depth of from one to two 

 inches in the loose soil at the base of the plant; always, however, remaining 



