30 PRELIMINARY LIST 



Resthenia contraterna Uhl. 



Colorado (Uhler, 1 and 6). Beaver Brook, August 6th (Uhler, 5). Idaho 

 Springs, July 6th (Packard— see Uhler, 5). Colorado (Gillette— see Osborn, 1). 



Resthenia insignis Say. 



Colorado (Uhler, 1 and 6). Colorado, as insignis and as rubrivittata 

 {Gillette— see Osborn, 1). 



North Park, July 20tli (Gillette) . Steamboat Springs, 

 July 15tli; Rabbit Ears Pass, July 20th (Baker). 



Resthenia insitiva Say. 



Colorado (Gillette— see Osborn, 1). 

 Resthenia maculicollis Eeut. 



Foot-hills twelve miles west of Fort Collins, June 30th 

 (Gillette). 



Oncerometopiis nigriclavus Eeut. 



Colorado (Gillette — see Osborn, 1). 



Dolores, June 18th; Estes Park, July 12th (Gillette). 

 Steamboat Springs, July 13th (Baker). Colorado Springs 

 (Tucker). 



Oncerometopus ruber Eeut. 



Foot-hills five miles west of Fort Collins, September 1st 

 (Gillette). 



l/Opidea coii£uens Say. 



Estes Park (Snow). North-east Colorado (Riley). 



I^opidea tnarginata Uhl. 



Colorado (Uhler, 8). 



I/opiclea media Say. 



Foot-hills and plains, September 19th and October 4th (Carpenter— see 

 Uhler, 6). Plentiful at Denver, Golden, Colorado Springs, and in the valley of 

 the Arkansas near Canon City, August 5th to 18th. Occured most frequently 

 upon the wild rose bushes (Uhler, 5). August 12th at Cottonwood Creek, 

 Pleasant Valley, Fremont County (Cockerell, 3). AVest Cliff, Custer County, 

 July 31st on Glycyrrhiza lepidota (Cockerell, 10). Colorado (Gillette— see 

 Osborn, 1). 



L/Opidea nigridia Uhler n. sp. 



"Thicker and more compact than L. media Say, mostly dull black, pubescent, narrowly 

 margined with rufo-fulvous or rufous on the outer border of the cerium, including most 

 of the cuneus. Head a little thicker than typical, dull black, pubescent, with a yellow 

 spot on each side of the vertex next the eye, continued slenderly downward, a red spot 

 on each side of the tylus, and the cheeks and sides below also red, with black sutures, the 



