28 g Canadian Arctic Expedition, 1918-18 



Bombus neoboreus, n. sp. 



This species is distinguished from the other species of the Kirbyellus group 

 by the structure of the eighth ventral segment in the male and by the strongly 

 marked melanism in both sexes. 



Male. — Eighth ventral segment truncate (see figure); inner margin of 

 claspers of genitalia nearly straight. Hair black; but a faint tinge of yellow 

 on centre of face and a few yellow hairs on vertex (occupit) ; thorax with the 

 anterior yellow band well developed, remainder of thorax black with a faint 

 tinge of yellow on the posterior part, and in the type (the lighter example) 

 yellow on the upper part of the pleura. Abdomen black, segment 1 yellow but 

 black in the middle and at the extreme sides; segment 2 yellow, but in the 

 darker example partly black in the middle apically and at the extreme sides 

 basally; segment 3 entirely black but in the lighter example yellow at the sides 

 apically; segments 4 and 5 black and segments 5 and 6 pale red. Hairs on legs 

 and underside black. Length, 16 mm. 



Queen. — Hair black; that on the head entirely black; on thorax, anterior 

 yellow band more or less encroached upon from behind in the middle by black, 

 posterior yellow band absent or rudimentary, absent in type; pleura black, 

 faintly tinged with yellow over a considerable area in some examples including 

 the type; abdomen, segment 1 yellow only at the sides, black on extreme sides; 

 segment 2 yellow, but black on extreme sides; segment 3 with a little yellow on 

 either side of middle in five specimens including the type, black in the four 

 remaining specimens; apex of segment 4 and whole of segment 5 red in three 

 specimens; segment 4 black and segment 5 tinged with red in eight specimens, 

 including type. Hairs on legs and underside black. Length, 22 to 24 mm. 



Worker. — Coloured like the queen. 



One male, Bernard harbour, Northwest Territories, August 17-18, 1915 

 (F. Johansen); one darker male, Bernard harbour, Northwest Territories, 

 July 10, 1916 (F. Johansen); eleven females, all from Bernard harbour, North- 

 west Territories, as follows: June 6, June 21, June 25 (type), July 2, July 9, 

 July 30 to August 7, August 8, August 17 to 18 (two), 1915, June 16, July 3, 

 1916 (F. Johansen); three workers, Bernard harbour, Northwest Territories, 

 July 19, August 10, and August 14, 1915 (F. Johansen). 



Bombus arcticus (Kirby) Franklin. 





Bombus arcticus Franklin, Trans. Amer. Ent. Soc. XXXVIII, p. 302. 



Male. — Malar space fully one-half as long as the eye, eighth ventral 

 segment obtusely pointed. Head black, a patch of yellow on the vertex. Thorax 

 black with a well-developed anterior yellow band and another equally wide 

 behind; pleura black, the yellow extending only a short way below the bases 

 of the wings. Abdomen, segments 1 and 2 densely clothed with yellow, the 

 remaining segments black. Legs black, underside black. Length, 15-17 mm. 



Queen. — Malar space about one-half as long as the eye. Head black; in 

 two examples a few of the hairs on the vertex are yellow. Thorax black with a 

 well-developed anterior yellow band and another equally wide behind; pleura 

 black but the yellow extends a short way below the bases of the wings. Abdomen 

 with the two basal segments with dense yellow hair, the remaining segments 

 black. Length, 20-23 mm. 



Ten males as follows: four from Bernard harbour, Northwest Territories, 

 August 14, 1915 (F. Johansen) ; one from Bernard harbour, Northwest Territories, 

 July 10, 1916 (F. Johansen); and five from Herschel island, Yukon Territory, 

 July, 1916 (F. Johansen). 



