390 AMERICAN HYMENOPTERA. 



Bombus ferviotus Kellogg, American Insects, 1905, p. 519. 



" dorsalis Viereck, Trans. Amer. Ent. Soc, XXXII, July, 1906, 

 p. 238. 

 ? " fervidiis Cockerell, Trans. Amer. Ent. Soc, XXXII, Nov., 

 1906, p. 313. 

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

 1906. p. 313, 

 Cockerell, Bull. Amer. Mus. Nat. Hist., XXII, Arti- 

 cle XXV, Dec. 17, 1906, p. 453, n. 111. 

 " fervidus Smith, Economic Entomology, 1906, fig. 473, b and 

 f, 9. 

 Lovell, Ent. News, XVIII, May, 1907, pp. 197-198, 

 9 y c?. 

 " pennsylvanicus Swenk, Ent. News, XVIII, July, 1907, p. 296, 



n. 2. 

 " dorsalis Cockerell, Univ. Color. Studies, IV, 1907, p. 258. 

 " fervidus Cockerell, Univ. Color. Studies, IV, 1907, p. 258 and 



p. 257. 

 " " Fletcher and Gibson, Can. Ent. Rec (Ann. Rep't 



Ent. Soc. Ont.), 1907, p. 16. 

 Davidson, Bull. So. Cal. Acad. Sci., X, 1911, p. 66. 



Pile of medium length and coarse. Head black ; thorax mostly yel- 

 low, sometimes with and sometimes without a black interalar band ; 

 pleura som.etimes light and sometimes partly dark ; dorsum of abdomen 

 with the first four segments yellow and the last two black ; venter black ; 

 legs black. Malar space moderately long. 



Queen. Head.— Kather elongate ; face black, but sometimes with a 

 very faint touch of yellow hair above the bases of the antennae (visible 

 with a lens); occiput black and sides black. Labrum with tubercle- 

 like areas well separated, the space between them and above the shelf - 

 like projection being deeply excavated, their summits more or less 

 strongly concave ; the shelf-like projection rather wide and prominent ; 

 translucent areas (in mounted labrum) distinctly visible to the naked 

 eye. Malar space longer than its width at apex, about one-third as 

 long as the eye. Clypeus rather coarsely punctate, except on anterior 

 median portion, this part being nearly smooth. Flagellum of antenna 

 not quite twice as long as the scape ; third antennal segment much 

 longer than fifth, the fifth somewhat longer than the fourth. 



Thorax. — Anterior part of dorsum and the scutellum covered with 

 yellow pile ; a black band of greatly varying width between the bases 

 of the wings ; center of disc naked ; mesopleura sometimes covered with 

 yellow pile to the bases of the legs, but usually with more or less of 

 the lower part black ; metapleura often entirely dark, but usually with 

 some light hair at the upper end ; sides of median segment usually en- 

 tirely dark, but often with more or less light pile. 



