326 AMERICAN HYMENOPTERA. 



Bombus columbicus Dalla Torre, Wien. entom. Zeitg., IX, 1890, p. 



139. 

 " californicus Dalla Torre, Cat. Hym., X, 1896, p. 513 (pars.). 

 " sp. Jordan and Kellogg, Animal Life, 1900, p. 161, fig. 96. 

 " columbicus Cockerell, Bull. So. Cal. Acad. Sci., Ill, June, 



1904, p. 89. 

 " sp. Kellogg, American Insects, 1905, p. 519, fig. 724 and fig. 



723. 



Types. — Male taken in California (described by Smith as 

 californicus) , in the collection of the British Museum ; queen, 

 location not known to me ; worker (described as californicus 

 by Cresson), in the collection of the American Entomologi- 

 cal Society. 



Pile rather short and demise. Face, occiput, anterior part of dorsum 

 of thorax and fourth dorsal abdominal segtnent covered mith yellow 

 pile ; the rest of the body bearing only black pile ; wings very dark. 

 Malar space rather short. 



Queen. Head. — Broadly triangular ; face heavily covered with pure 

 yellow pile, the yellow nearly reaching the inner margins of the eyes 

 on either side, covering the base of the clypeus below and extending 

 above onto the lower part of the vertex ; occiput well covered with a 

 broad triangular patch of pure yellow, the front hairs of this patch and 

 the upper ones of the facial patch meeting somewhat over the ocelli 

 and partially concealing them ; remainder of head bearing only black 

 hair, except a little of ferruginous color borne by the mouth parts. 

 Labrum much as in californicus , translucent areas indistinct or absent ; 

 malar space not as long as it is wide at the apex, not more than one- 

 fifth as long as the eye ; clypeus moderately punctate ; third antennal 

 segment considerably longer than fifth, fifth somewhat longer than 

 fourth. 



Thorax. — Anterior part of dorsum covered with pure yellow pile ; 

 remainder, including pleura from about the level of the bases of the 

 wings, entirely black ; center of disc naked, smooth and shining. 



Abdom,en. — Entirely black, except the fourth dorsal abdominal seg- 

 ment, this being covered with pure yellow pile. Hypopygium without 

 median carina. 



Wings. — Very dark brown with slight violaceous reflections ; fore- 

 wings lightest in the apical portion, beyond the veins. 



Legs. — Coxae, trochanters, femora, fore and middle tibiae and cor- 

 bicular fringes all black. Posterior metatarsi bearing only short 

 spines and pubescence, except for a fringe of short hairs on the basal 

 portion of the posterior border. 



Worker. — Like the queen, but usually with considerably lighter 

 wings ; translucent areas of labrum often large enough to be faintly 

 visible to the naked eye. 



