HYMENOPTERA 1 25 



The head is clothed with a black pubescence ; the malar space is 

 long, nearly one-half the length of the eyes ; the second joint of the 

 flagellum is much shorter than the first, or the third, and scarcely 

 longer than thick ; while the wings are blackish fuscous, the tegulas 

 piceous, impunctate. 



Worker. — Length 13 mm. Agrees well with the female in color, 

 except that the head has a tuft of yellowish hairs on the vertex and on 

 the face, while the mesopleura are also yellowish. The fulvo-rufous 

 pubescence on abdominal segments 3 and 4 is confined entirely to the 

 lateral margins, the median portion of the segments being bare and 

 shining, while the fifth segment also has a small tuft of fulvo-rufous 

 hairs at its extreme lateral margins. 



Male. — Unk no wn . 



Tyfe.—Q-A\.. No. 5718, U. S. Nat. Museum. From Alaska (U. S. 

 Coast and Geodetic Survey). 



In the collection of the American Entomological Society is a single 

 worker agreeing well with the female, except in its smaller size, and 

 labelled Bombus hoivardu Cresson, Silver Lake, Utah, July 16. 



This species comes evidently nearest to B. medius Cresson and B. 

 dzibius Cresson, but is easily separated from both by the difference in 

 the color of the scutellum and abdomen, and by the longer malar 

 space. 



BOMBUS MCKAYI sp. nov. 



Female. — Length 19 mm. Black, clothed with a black pubescence, 

 the middle of the face below the antennae, thorax above anteriorly, 

 scutellum posteriorly and the third, fifth and sixth dorsal segments of 

 abdomen clothed with a pale yellowish-white pubescence, the black 

 pubescence of the second segment overlaps the base of the third and 

 the black pubescence of the fourth segment overlaps the base of the 

 fifth or the hairs are white at apex. 



The head seen from in front, is a little longer than wide, the malar 

 space being distinct, rather long, as long as the pedicel and first joint 

 of the flagellum united ; the forehead, between the ocelli and base of 

 the antenuce is distinctly punctate ; the ocelli are pale and arranged 

 almost in a straight line ; while the wings are fuscous with the tegulae 

 and the veins black. Legs black, with a small spot of hairs at apex 

 of front and middle tibia before and behind, and the hind tibiae before 

 and behind fringed with fulvous hairs. The antennae are broken off 

 at tips but the joints of the flagellum remaining are as follows : The 

 first joint is the longest, obconical, a little longer than the third or 

 fourth, which are equal in length and a little longer than the second. 



