202 U. S. NATIONAL MUSEUM BULLETIN 216 paut 3 



Wings weakly to strongly infuscate, darker in female than in 

 male; abdomen varying from entirely black to entirely ferruginous, 

 if partly ferruginous and partly black the black is basal and the 

 ferruginous is apical. 



There is a cline in the degree of wing infuscation and another 

 in the amount of black on the abdomen, which result in dijfferences 

 between extreme populations that are conspicuous and constant, 

 but with so many intermediates that it seems impractical to dis- 

 tinguish subspecies on these characters. Part of the difBculty is 

 that the abdominal color of males and females varies a little inde- 

 pendently, and separation of color subspecies according to this 

 character would result in different geographic limits according to 

 whether the male or the female colors were emphasized. Populations 

 from some borderline areas (as a series from Blanco's Corral, White 

 Mt., Mono Co., Calif.) tend to have the male abdomen black and 

 the female abdomen ferruginous. The intensity of wing infuscation 

 increases gradually from north to south, or from areas of less sun to 

 areas of more sun. The black on the abdomen decreases from east 

 to west. Specimens from the Rocky Mountains, from Alaska to 

 New Mexico, have the abdomen black except that in some females 

 from Colorado and Wyoming it is partly or mostly ferruginous. 

 Specimens from California and southern Oregon have the abdomen 

 ferruginous, with the first segment often infuscate basally in the 

 female and always entirely black in the male. A few females at 

 hand from the Great Basin have the abdomen ferruginous Vvdth the 

 first segment black and usually with some basal infuscation on the 

 second tergite. A third cline, one that is relatively inconspicuous, 

 is that the femora and tibiae grade from fulvous in specimens from 

 the northern parts of the range to ferruginous in specimens from 

 the central and southern parts of the range, most intensely ferrugi- 

 nous in those from California and southern Oregon. 



Specimens (124 cf, 172 9): From Alaska (Eagle, Kenai Peninsula, 

 Ketchikan, and Matanuska); Alberta (Banff and near Banff on the 

 Banff -Jasper Highway, Beaverlodge, Calgary, Cypress Hills, 

 Waterton, and Waterton Lakes); British Columbia (Atlin, Blue 

 Lake west of Lytton at 7,000 ft., Chilcotin, Fort St. John, Mount 

 Apex near Hedley at 5,800 ft., Pouce Coupe, and Ta3-lor) ; California 

 (Angora Peak at 8,625 ft., 3 miles east of Bishop, Blanco's Corral 

 on White Mt. in Mono Co. at 10,000 ft., Dardanelle, Donner Pass, 

 Hope Valley in Alpine Co., Independence Lake in Sierra Co., Leavitt 

 Meadow in Mono Co., Marie Lake in Fresno Co. at 10,500 ft., Mono 

 Co. at 7,700 ft.. Mono Lake, near Mono Pass in Inyo Co. at 12,000 

 ft.. Mount Dana in Tuolumne Co., Mount Tallac near Lake Tahoe, 

 Pioneer Basin in Fresno Co. at 10,000 to 11,000 ft., 1 mile north of 



