376 AMERICAN HYMENOPTERA. 



Boiiibvis (Bombiis) anibiguus Franklin. 

 Boinbus anibiguus Franklin, Trans. Amer. Ent. Soc, XXXVII, 1911, 

 p. 159, 9 S . 



Types. — Described from one queen (the type), deposited in 

 the collection of Leland Stanford Jr. University, and six 

 workers (cotypes), distributed evenly in the collections of 

 the American Entomological Society, the Massachusetts 

 Agricultural College and Leland Stanford Jr. University. 



Pile of medium length and rather coarse ifi texture. Face and occi- 

 put with considerable yellow pile ; dorsum of thorax with mixed black 

 and yellow pile in front and mostly dark between the bases of the wings 

 and on the scutellum ; mesopleura yellow ; dorsum of abdomen yellow 

 at base, black in the middle and black or slightly ferrugi7ious at apex ; 

 wings rather strongly stained with brown . Malar space long. 



Queen. Head. — Face and occiput with large patches of pure yellow 

 pile ; cheeks mostly dark, but with a little yellow hair on the ventro- 

 lateral portions. Labrum with tubercle-like areas large and not 

 greatly separated, their margins rounded and summits only moder- 

 ately concaved, almost flat ; the shelf-like projection narrow and not 

 very prominent. Malar space distinctly longer than its width at apex, 

 fully one-fourth as long as the eye. Clypeus sparsely and delicately 

 punctate over the disc, almost smooth, the corners coarsely punctate. 

 Third antennal segment much longer than the fifth, the fifth longer 

 than the fourth. 



Thorax. — Anterior part of dorsum covered with a mixture of black 

 and yellow pile, the region between the bases of the wings entirely 

 black and the scutellum mostly black, but with a slight sprinkling of 

 yellow hairs on its hind margin ; center of disc naked, smooth and 

 shining ; a line of dark pile running forward from the tegula on each 

 side ; mesopleura entirely covered with yellow pile to the bases of the 

 legs ; metapleura mostly yellow, but partly dark ; sides of median seg- 

 ment dark. 



Abdomen. — Dorsum : segment one well covered with yellow pile on 

 the sides, but rather sparsely clothed and with a few dark hairs in the 

 middle ; segment two for the most part well covered with yellow pile, 

 but less densely clothed and with a few black hairs on the basal mid- 

 dle ; segments three and four entirely black ; segment five black at 

 base, but with light ferruginous pile on the apical portion, especially 

 in the middle ; segment six mostly ferruginous, but with some black 

 hairs on the sides. Venter with the apical margins of all the seg- 

 ments, except the basal and apical one, well fringed with light yellow 

 hair. 



Wings. — Somewhat strongly stained with brown, the fore pair much 

 the lightest across their middle portions. 



