422 AMERICAN HYMENOPTERA. 



Bombus scutellaris var. Cockerell and Porter, Ann. and Magaz. Nat. 

 Hist., Ser. 7, IV, 1899, p. 390. 

 Titus, Can. Ent., XXXIV, 1902, pp. 38 and 41. <f . 

 Ent. News, XIV, April, 1903, p. 132. 

 Bombias " Robertson, Trans. Amer. Ent. Soc, XXIX, 1903, 



p. 177, 9 B cf . 

 Viereck, Trans. Amer. Ent. Soc, XXXII, July, 

 1906, p. 224. 

 Bombus " Cockerell, Trans. Amer. Ent. Soc, XXXII, Nov., 



1906, p. 313. 

 Cockerell, Ent. News, XVIII, June, 1907, p. 265. 

 Bombias " Swenk, Ent. News, XVIII, July, 1907, p. 294, n. 2. 



Types. — The male is in the collection of the British Mu- 

 seum ; at least a part of the queen and worker type speci- 

 mens are in the collection of the American Entomological 

 Society. 



Pile short and rather coarse. Wings dark. Anterior part of dorsum 

 of thorax and scutellum. yellow {fetnales with a black interalar band) ; 

 m.esopleura m.ostly yellow ; first two dorsal segments of abdom,en yellow, 

 the rest black ; legs black. Malar space short. 



Queen. Head. — Strongly rounded and black. Labrum with tubercle- 

 like areas well separated, their summits strongly concaved and punc- 

 tate and margins rather sharply elevated ; median portion, above the 

 shelf-like projection, deeply excavated ; shelf-like projection broad and 

 prominent ; translucent areas faintly visible to the naked eye ; anterior 

 margin outcurved and slightly suggestive of Psithyrus. Malar space 

 somewhat less than one-half as long as its width at apex. Ocelli 

 placed well below the supra-orbital line (fig. D). Flagellum of an- 

 tennae nearly one and two-thirds times as long as the scape ; third an- 

 tennal segment somewhat shorter than the fourth and fifth taken 

 together, the fourth shorter than the fifth. 



Thorax. — Anterior part of dorsum and scutellum covered with yel- 

 low pile, a broad black band between the bases of the wings ; center 

 of disc naked and shining. Mesopleura mostly covered with yellow 

 pile, but the yellow only very rarely reaching the bases of the legs. 

 Metapleura and sides of median segment dark. 



Abdom.en. — Dorsum : segment one mostly clothed with yellow pile, 

 but with some black hair on the corners of the anterior face (in front 

 of the apparent front margin); segment two clothed with yellow pile, 

 the hind border of the yellow being distinctly, though not deeply, 

 notched in the middle (in the most perfect specimens) ; remaining seg- 

 ments black. Venter dark. Hypopygium without a median carina. 



Wings. — Very dark. The fore pair with distinct, but not strong, vio- 

 laceous reflections ; lightest in the region beyond the veins and darkest 



