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 18th to June 5th; RAst Canon, 
May 19th to August 8th; The Rustic, Larimer County, 
August 11th; Steamboat Springs, July 26th; Colorado 
Springs, August 3d; 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). 
Dicdrocephala mollipes 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). 
Diedrocepliala novaehoracensis Fitch. Det. VanDuzee. 
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 (VanDuzee, 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). 
Helocliara communis Fitch. Det. VanDuzee. 
Very 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. VanDuzee. 
Clear Creek Canon, August 7th (Uhler, 5). Custer County, midalpine 
(Cockerell, 10). Colorado (VanDuzee, 4). 
Fort Collins, June 14th to October 15th; foot-hills five 
miles west of Fort Collins, March 12tli 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). 
