264 AMERICAN HYMENOPTERA. 



Legs. — Dark ; the corbicular fringes usually black, but often more 

 or less strongly fulvo-ferruginous. 



Worker. — Much like the queen ; rarely as much as the upper halves 

 of the mesopleura covered with yellow pile. 



Male. — Head. — Entirely dark. Malar space fully as long as its width 

 at apex, about one-fourth as long as the eye. Clypeus pretty well 

 covered up with pile. Third and fifth antennal segments subequal in 

 length, the fourth shorter than either. 



Thorax. — Colored like that of the females. 



Abdoinen. — Colored much like that of the females ; the apical dorsal 

 segments entirely covered with white pile. 



Witigs. — About like those of the females. 



Legs. — Mostly dark ; the hind coxae and trochanters and the bases of 

 the hind femora with considerable light pile; the fore and middle tibise 

 with considerable ferruginous pile on their hind sides ; posterior tibiae 

 with outer faces somewhat convex and naked, smooth and shining ; 

 the corbicular fringes mostly dark, but rather strongly tinged with ferru- 

 ginous ; posterior metatarsi with short hind fringes. 



Dimensions. — Length: queen, 18 mm. to 20 mm. ; worker, 12 mm. 

 to 15 mm. ; male, 16 mm. Spread of wings: queen, 39 mm. to 44 

 mm. ; worker, 24 mm. to 33 mm. ; male, 39 mm. Width of abdomen 

 at second segment: queen, 9 mm. to 11 mm. ; worker, 6 mm. to 8^ 

 mm. ; male, 8^ mm. 



Redescribed from seven queens (two of them homotypes), 

 ten workers and one male. 



Habitat. — This form ranges throughout the greater part of 

 Europe and Siberia. In the New World, it appears to be con- 

 fined to Alaska, though it may possibly be found in the ad- 

 joining territory of Yukon. My Alaskan records are as fol- 

 lows : Point Barrow, Cosmos, Kukak Bay, Koyukuk and 

 Kadiak. I also have records from Petropaulski, Kamchatka 

 and Bering Island. 



I have seen a large series of all three castes (in Museum 

 of Comparative Zoology) of this form from Sweden and 

 Bavaria. One of the males bore the label ''' B ambus ferriigin- 

 eus'' and the determination was by Gerstaecker. There is 

 also a queen in the collection of the Massachusetts Agricul- 

 tural College labelled " Bombus terrestris var. ferrugineus " by 

 Schmiedeknecht. 



Nests. — Schmiedeknecht says that terrestris generally has 

 its nests under ground and that they often contain hundreds 

 of individuals. 



