408 U. S. NATIONAL MUSEUM BULLETIN 216 



spots on these tergites, and sometimes narrow stripe along part of 

 lower edge of eighth tergite, white, the paramedian and apicolateral 

 spots of seventh tergite sometimes partly fused but not making a 

 uniform band as in the amoena group of species; palpi light brown; 

 hind tibia fuscous brown; hind tarsus fuscous; legs fulvous except as 

 described otherwise, the extreme apex of hind femur somewhat in- 

 fuscate and the coxae and hind trochanters and femur sometimes more 

 or less infuscate. The hind coxa, trochanters, and femur are more 

 frequently infuscate in Nearctic than in European specimens. 



Colorational features which particularly characterize this species 

 are: flagellum without white band; temporal orbit partly or entirely 

 white; mesopleurum with a white spot near middle coxa but usually 

 without any other white except on subtegular ridge and mesepimeron, 

 and seventh tergite of female with a pair of spots (a long one and a 

 short one) on each side that are not or only incompletely fused. The 

 male is very distinct in having a single convex sternite on the second 

 through fourth abdominal segments. Both sexes have the face more 

 sparsely hairy medially than laterally. 



Specimens (34 cf, 829): From Alberta (Banff and Laggan); 

 Arizona (near Alpine, Bear Wallow on Mount Lemmon, and Pocket 

 Creek and Workman Creek in the Sierra Ancha); British Columbia 

 (Lytton, Forbidden Plateau at Mackenzie Lake on Vancouver Island 

 at 3,200 ft., Revelstoke, Robson, and Terrace); California (Buck's 

 Lake in Plumas Co., Echo Lake at 7,200 ft., "Fieldrock," near Glacier 

 Point in Yosemite Park, Mammoth, Tahquitz Valley in the San 

 Jacinto Mts. in Riverside Co., Trinity Co. at 6,000 ft., and Willow 

 Creek in the San Jacinto Mts.); Colorado (near Estes Park, Garden 

 of the Gods, Manitou Park, Pingree Park in Larimer Co., Silverton 

 at 9,500 ft., Waldo Canyon in Fremont Co., and Williams Canyon in 

 El Paso Co.); Idaho (Wallace); Manitoba (Cedar Lake and Kettle 

 Rapids near Winnipeg); Massachusetts (Walden); Michigan (Isle 

 Royale, Mackinac Island, and Whitefish Point in Chippewa Co.); 

 Minnesota (Cook Co.); New Brunswick (Bathurst); Newfoundland 

 (St. Johns) ; New Hampshire (Franconia and Mount Madison) ; New 

 Jersey; New York (Boreas River in Essex Co. and New York City); 

 North Carolina (Pisgah Ridge) ; Oregon (Grant Co.) ; Ontario (Moose 

 Factory on James Bay) ; Quebec (Aylmer) ; Tennessee (Great Smoky 

 Mountains National Park at 5,000 to 6,000 ft.) ; Texas; Utah (Scofield 

 at 8,000 ft.); Vermont (Laurel Lake near Jacksonville); Washington 

 (Bumping River, Metaline Falls, Mount Rainier at 4,000 ft., and 

 Ritzville); and Wyoming (Camp Roosevelt in Yellowstone Park). 

 We have additional specimens from France, Germany, and Italy. 



Dates of capture are mostly in June, July, and August, but a few 

 are in late May, and we found the species moderately common in the 



