168 HYMENOPTERA. 



Thorax. — Dorsum yellow, with usually poorly defined black band 

 between the bases of the wings, or at least with a large black spot on 

 the disk (when a distinct band is present, it usually extends back, in 

 the middle, onto the middle of the scutellum); mesopleurse usually 

 covered with yellow pile to the bases of the legs, but sometimes with 

 their lower portions dark ; metapleurae sometimes dark and sometimes 

 yellow, but usually with considerable yellow pile ; sides of the median 

 segment sometimes entirely dark, but usually with considerable light 

 pile admixed. ^ 



Abdotnen. — Dorsum : segment one, entirely or mostly yellow ; seg- 

 ment two, sometimes entirely yellow, sometimes yellow in the middle 

 with a black spot on each side, and sometimes entirely black ; segment 

 three, entirely yellow, yellow on the sides and more or less black in the 

 middle, or even nearly or entirely black ; segment four yellow ; seg- 

 ment five black, sometimes with a slight sprinkling of j'ellowish or fer- 

 ruginous hairs ; segment six often entirely clothed with fulvo-ferrugin- 

 ous pile, but frequently with more or less black pile on the basal por- 

 tion ; segment seven with yellowish-ferruginous, or fulvo-ferruginous 

 pile. Venter, at least on the sides, with considerable yellow pile. 



Wings. — Somewhat stained with brown, often subhyaline ; the fore 

 pair usually darkest in the region beyond the veins. 



Legs. — Mostly dark ; the trochanters and femora often with consider- 

 able yellow pile ; tibiae and the very tips of the femora often with con- 

 siderable ferruginous hair ; the tarsi with more or less fulvo-ferrugin- 

 ous hair. 



Dimensions . — Length, lOi mm. to 14 mm. ; spread of wings, 25 mm. 

 to 32 mm. ; width of abdomen at second segment, h\ mm. to 7 mm. 



Habitat. — I have records of this species as follows : Alaska 

 (Fort Wrangle, Juneau, Sitka and Fox Point). Alberta 

 (Banff), British Columbia (Metlakatla), Washington (Olym- 

 pic Mts.), Colorado (Ward and Pagosa Peak), New York 

 (Brant Lake and Otto), Nova Scotia (Weymouth — P. G. 

 Bolster, collec.tor), and New Hampshire (Durham, Webster 

 and Mt. Washington). It is probably also present in the fol- 

 lowing States : Oregon, northern California, Idaho, Mon- 

 tana, Wyoming, Utah, North Dakota, Minnesota, Wisconsin, 

 Michigan, Vermont, Maine, and possibly parts of Massachu- 

 setts and Pennsylvania. It probably also ranges throughout 

 a considerable portion of Canada, from the Atlantic to the 

 Pacific Ocean. It is mainly a Boreal species, but it runs over 

 into the Transition Zone somewhat. 



