298 AMERICAN HYMENOPTERA. 



Legs. — Mostly dark brown, but with tips of corbicular fringes usu- 

 ally somewhat yellowish ferruginous. 



Worker.— 'biot seen. 



Male. Head. — Face and occiput with yellow and black pile mixed. 

 Malar space between one-third and one-half as long as the eye. Cly- 

 peus pretty well covered up with mostly yellow pile. Third, fourth 

 and apical antennal segments subequal in length, shorter than any of 

 the rest except the pedicel. 



Thorax. — Colored much like that of the females. 



Abdomen. — Dorsum: first three segments yellow; segment four 

 black ; segment five mostly black ; segments six and seven entirely 

 ferruginous. Venter with strong admixture of yellow hairs. 



Wings. — Clear hyaline. 



Legs. — Coxae, trochanters and femora with considerable yellow pile ; 

 hind tibiae and fore, middle and hind metatarsi fringed with long, light 

 ferruginous hair. 



Dimensions. — Length: queen, 19 mm. to 25 mm.; male, 16^ mm. 

 Spread of wings : queen, 43 mm. to 47 mm. ; male, 34^ mm. Width 

 of abdomen at second segment : queen, 10 mm. to IH mm. 



Redescribed from four queens and one male. 

 Habitat. — I have only the three following definite records 

 of this species : Hudson Bay Country, Fort Yukon (Alaska) 

 and Fort Cosmos (Alaska). It must range through the 

 country intervening between these points, but nothing defi- 

 nite is known concerning its limits in any direction. It is 

 certainly a strictly Boreal form and it seems to be rare 

 throughout its range of habitat. 



This species is very closely allied to B. kincaidii Ckll. and 

 apparently to B. kirbyellus Curtis also. It may be readily 

 separated from the latter by means of the yellow third dor- 

 sal abdominal segment and the dark lower portions of the 

 pleura. The third segment is more strongly and completely 

 yellow than in kincaidii, and the yellow extends down onto 

 the mesopleura farther than in that species ; furthermore, 

 the apical abdominal segments of the female kiyicaidii are 

 entirely black. 



Boinlms (Bomb vis) polaris Curt. 

 Bombus polaris Curtis, Descr. Insects CI. Ross' Second Voyage, 1835, 

 App., p. 63, n. 7, 9 cf . 

 Erichson, Arch. f. Naturg., II, P. I, 1836, p. 288, n. 9. 

 Smith, Catal. Hymen. Brit. Mus., II, 1854, p. 397, n. 

 43, 9 . 



