384 AMERICAN HYMENOPTERA. 



tarsi bearing only short spines and pubescence, except for a posterior 

 fringe of rather long hairs. 



Dimensions. — Length: queen, 11 mm. to 15 mm. ; worker, 7 mm. 

 to 11 mm. ; male, 8 mm. to 11 mm. Spread of wings: queen, 27 

 mm. to 31 mm. ; worker, 17 mm. to 25 mm. ; male, 21 mm. to 25 

 mm. Width of abdomen at second segment: queen, 8 mm. to 9>\ 

 mm. ; worker, 4 mm. to 7 mm. ; male, 4| mm. to 6^ mm. 



Redescribed from twelve queens (one a homotype), twenty- 

 seven workers (two homotypes) and eleven males. 



Habitat. — I have records of this species from Alaska, 

 British Columbia, Alberta, Saskatchewan (in the old sense), 

 Vancouver Island, Labrador, Washington, Idaho, Montana 

 (western part), Oregon, California (Humboldt County), 

 Wyoming and Colorado, Is it present in southern Califor- 

 nia, Nevada, Utah, or northern New Mexico ? What is its 

 most southern limit in central and eastern Canada ? Is it to 

 be found in northern Minnesota, northern Michigan, or north- 

 ern Maine ? Though not very rare in western Montana, it is 

 probably not present in the eastern part of that state or in 

 any of the states east of those from which the records have 

 been given above. It seems to be a pretty strictly Boreal 

 Region form, apparently reaching its greatest abundance in 

 Alaska and northwestern Canada, though not very rare in 

 eastern, central or southwestern Canada or in parts of Wash- 

 ington, Montana, Wyoming, or Colorado. My most northern 

 record is Seldovia, Alaska (Harriman Expedition — Trevor 

 Kincaid collection — several specimens) . How far north does 

 the species range ? 



This species is closely allied to B. alboanalis, but can be 

 readily separated from it by the mixed yellow and black pile 

 on the anterior part of the dorsum of the thorax and by the 

 prominent tufts of hair on the basal segments of the flagel- 

 lum of the male antennae. Other close allies are sitkensis 

 and couperi. 



As has already been shown, the species is somewhat vari- 

 able. I have seen specimens (five queens and eleven 

 workers) from a nest collected at Bozeman, Montana, and 

 among them there was but little variation. 



I have the following evidences that the male here described 



