548 U. S. NATIONAL MUSEUM BULLETIN 216 



There are two subspecies, distinguished as in the key and descrip- 

 tions below: 



1. Abdomen partly ferruginous but largely blackish; thorax entirely black; wings 

 subhy aline or faintly brown in both sexes; range: British Columbia to Oregon, 



east to Idaho la. occidentalis occidentalis Cresson 



Abdomen entirely ferruginous; thorax largely or entirely ferruginous; wings 

 light brown in male, dark brown in female; range: California. 



lb. occidentalis pulchripennis Cushman 



la. Coleocentrus occidentalis occidentalis Cresson 



Coleocentrus occidentalis Cresson, 1878, Proc. Acad. Nat. Sci. Philadelphia, vol. 

 1878, p. 376; ? . Type: 9 , Vancouver Island, B. C. (Philadelphia). 



Male: Black. Face, palpi, and under side of scape pale yellow, the 

 face sometimes with a median black stripe; tegula, front and middle 

 coxae in front, front and middle trochanters, front and middle femora 

 at apex and in front, and front and middle tibiae and tarsi, yellow; 

 front and middle legs pale fulvous except where described as yellow, 

 their coxae more or less infuscate; hind coxa blackish with fulvous 

 stains to fulvous with the base infuscate; hind trochanters fulvous, 

 yellowish beneath; hind femur fulvous, sometimes infuscate; hind tibia 

 brownish, darkest apically, basally fulvous; hind tarsus yellow, the 

 basal 0.8 ± of its first segment brownish; second to fourth abdominal 

 tergites laterally more or less reddish brown; wings faintly tinged with 

 brown. 



Female: Black. Face laterally and scape beneath more or less 

 yellowish fulvous; clypeus largely ferruginous; palpi and legs fulvous, 

 the coxae infuscate basally and sometimes almost entirely blackish; 

 hind tibia brownish, paler basally; hind tarsus yellowish fulvous, the 

 basal 0.6 ± of its first segment reddish brown; abdomen reddish brown, 

 the basal 0.8 of its first segment blackish and the tergites beyond the 

 midlength of abdomen somewhat infuscate, especially above; wings 

 lightly tinged with brown. 



Specimens (58 d", 719): From British Columbia (Copper Mountain, 

 "Cornot Glacier," Courtenay, Cultus Lake, Diamond Head Trail near 

 Squamish, Duncan, near Haney in Garibaldi Park, Goldstream, 

 Kaslo, Nanaimo Lake on Vancouver Island, Osoyoos, Oyster River, 

 Point Holmes near Comox, Robson, Royal Oak, Skagit Valley, Steel- 

 head, Vancouver, Victoria, and Wellington); Idaho (Moscow Mt. and 

 Priest Lake); Montana (Yaak River in Kootenai National Forest); 

 Oregon (Lost Prairie in the Cascade Mts. in Linn Co., Mary's Peak, 

 and Pamelia Lake on Mount Jefferson at 3,000 ft.); and Washington 

 (Ashford, Blue Mt., Easton, Elbe, Fairfax, Forks, Lake Cushman in 

 Mason Co., Lake Keechelus, Mount Constitution on Orcas Island, 

 Montesano, Orcas Island. "Penn Mines in the Cascade Mts.," Quil- 



