PSYCHE 



VOL. XX. DECEMBER, 1913. No. 6 



THE DRAGON-FLY GENUS AGRION (CALEPTERYX) 

 IN COLORADO. 



By T. D. A. Cockerell, 

 Boulder, Col. 



The beautiful genus Calepteryx, or as it seems we must now call 

 it, Agrion, has a curious distribution in North America. Repre- 

 sented by several species in the eastern states, both north and 

 south, it disappears westward of Iowa, to reappear, so far as the 

 records have shown, only in the state of Washington, where A. 

 ocquabile subspecies yakima (Hagen) occurs on the Yakima River. 

 However, on September 30, 1907, Mr. G. Hite took a male at 

 Overland Lake, in the Canadian Zone of Boulder County, Col. 

 This has remained unrecorded, because I repeatedly tried to iden- 

 tify it with one or other of the described forms, always without 

 success. I did not like to propose it as new without seeing a good 

 series of the genus, but now, after comparing it with the materials 

 in the LTnited States National Museum, I can only conclude that 

 it represents a valid new race, as might have been expected. 



Agrion sequabile coloradicum Nov. 



Male. Structure and colors in the main as in A. cequabile; abdomen above rich 

 purple, decidedly bluer than normal vquabile; structural characters of abdomen 

 (both the apical and subbasal inferior structures carefully compared) not quite 

 as in the aequabile compared, but probably not affording anything specific; anterior 

 wing 29.5 mm. long, of which the apical 8 mm. is black; posterior wing 28.5 mm. long, 

 of which the apical 10 mm. is black; in each case the black is quite intense, and has 

 a practically straight inner margin, forming an angle with costa a little greater than 

 a right angle; 24 antenodal cross-nervures in anterior wing, 22-24 in hind wing; 

 costa blue. 



As might perhaps have been expected, this appears to be nearest 

 to the subspecies, yakima, which agrees in having the inner side of 

 the apical black of the wings practically straight ; in this character 



