82 PRELIMINARY LIST 



the canon of the Arkansas (Uhler, 6). Foot-hilis and plains, August to 

 October (Carpenter — see Uhler, 6). 



Horse-tooth Gulch, May ISth to June 5th; Rist Canon, 

 May 19th to August Sth; The Rustic, Larimer County, 

 August 11th; Steamboat Springs, July 26th; Colorado 

 Springs, August 3cl; Manitou, June 25th to September 29th 

 on willow and oak; Montrose, June 24th; Dolores, June 18th 

 (Gillette). Fort Collins, June 13th to October 7th; on Red- 

 stone Creek, twelve miles south-west of Fort Collins, August 

 1st, exceedingly abundant, flying up in a cloud as one walked 

 through the low herbage (Baker). 

 Dieclrocephala inollipes Say. 



Very abundant on grass and weeds in low spots near Denver, and near 

 Golden, August 5th and later in the month (Uhler, 5). Colorado (Uhler, 6). 

 Custer County, midalpine (Cockerell, 10). 



Diedrocephala novaeboracensis Fitch. Det. VauDuzee. 



Near East River, August 29th (Carpenter — see Uhler, 6). More particularly 

 a foot-hill and mountain spocies; Clear Creek Canon and Golden, Audust 5th 

 to 7th; west of Denver, August 9th (Uhler, 5). Colorado (YanDuzee, 4). 



Glenwood Springs, August 24th; Steamboat Springs, July 

 26th; Fort Collins, September 27th on grass and Carex 

 (Gillette). Steamboat Springs, July 12th on Carex (Baker). 



Helochara communis Fitch Det. YanDuzee. 



Yery common in grassy marshy spots in the bed of the creek passing 

 through Denver, also in similar situations on farms west of Denver (Uhler, 5). 



Fort Collins, April 7th to October 15th; Steamboat 

 Springs, July 26th; Dolores, June 18th (Gillette). Steam- 

 boat Springs, July 12th on Carex; Fort Collins and the 

 adjoining foot-hills, during winter, hibernating under stones 

 and boards (Baker). Colorado Springs, August (Tucker). 

 Xerophloea peltata Uhl. Det.JY anDuzee . 



Clear Creek Canon, August 7th (Uhler, 5). Custer County, midalpine 

 (Cockerell, 10). Colorado (YanDuzee, 4). 



Fort Collins, June 14th to October 15th; foot-hills five 

 miles west of Fort Collins, March 12th to September 1st; 

 Glenwood Springs, August 24th (Gillette). On Redstone 

 Creek, twelve miles south-west of Fort Collins, August 1st; 

 Fort Collins, August 26tli on Helianthus annuus (Baker). 



