142 AMERICAN HYMENOPTERA. 



females in coloration, but with some yellow hair 07i face and occiput 

 and with yellow pleura. 



Queen. Head. — Rather broad and rounded in general form, with 

 only dark pile. Malar space distinctly wider at apex than its length, 

 not over one-sixth as long as eye. Clypeus, for most part, rather 

 strongly and coarsely punctate, but sparsely so (almost smooth) toward 

 the middle line. Ocelli large and distinctly below supra-orbital line, 

 in narrowest part of vertex (distinctly Bonibias in character). Third 

 antennal segment about as long as fourth and fifth taken together. 



Thorax. — Front part of dorsum covered with yellow pile back to 

 tegulse ; a broad black band between bases of wings (this band is 

 slightly more than half as broad, from front to rear, as it is long, from 

 wing base to wing base) . Tegulae sometimes completely surrounded 

 by black pile, but usually with yellow pile in contact with them on the 

 upper side of their front end. Center of disc with a considerable area 

 completely naked, the middle portion of this area being smooth and 

 shining. Scutellum covered with yellow pile, the front median por- 

 tion often being somewhat naked. Pleura, from bases of wings to 

 bases of legs, and median segment black and with dark pile only 

 (rarely there is a very slight sprinkling of yellow hairs on the pleura 

 and on the sides of the median segment) . 



Abdomen. — Dorsum : segments one and two clothed with yellow 

 pile ; segments three, four and five densely covered with rich ferru- 

 ginous-red pile; segment six clothed with short ferruginous-red hairs. 

 Venter mostly dark, but with the apical fringes of the three apical 

 segments more or less ferruginous. Hypopygium without a median 

 carina. 



Wings. — Dark, as in B. crotchii Cress., and with distinct violaceous 

 reflections. 



Legs. — Coxae, trochanters, femora and tibiae all black and bearing 

 no light pile ; corbicular fringes black. 



Worker. — Much like queen, but with wings lighter and usually with- 

 out violaceous reflections. Corbicular fringes proportionately longer 

 than those of queen. 



Male. Head. — Black, but with face below bases of antennae rather 

 strongly yellow, with black hairs intermixed ; sides behind eyes black ; 

 occiput rather weakly covered with yellow hairs. Malar space very 

 short, not much longer than pedicel of antenna. Ocelli large and 

 placed far below supra-orbital line. Eyes greatly swollen, bulging out 

 from sides of head. Antennae with third segment fully as long as 

 fifth, the fourth much shorter than either. 



Thorax. — Dorsum entirely and densely covered with yellow pile, 

 except for a broad, but rather indefinite (due to intermingling of yel- 

 low hairs) , black band between bases of wings. Pleura covered with 

 yellow pile to bases of legs. 



Abdomen. — Dorsum : first three segments covered with yellow pile, 



