158 AMERICAN HYMENOPTERA. 



former and three of the latter, one of each being deposited 

 in the collection of the Massachusetts Agricultural College 

 and the rest in the collection of the United States National 

 Museum. The worker cotypes were collected at Callanga, 

 Peru, and the males in Ecuador. 



Black and with entirely black pile, except the disc of the thorax and 

 the apical portion of the abdomen above clothed ivith white pile Wings 

 rather light. 



Qtieen. Head. — Clothed entirely with dark brown or black pile. 

 Malar space shorter than its width at apex, between one-fifth and one- 

 sixth as long as eye. Clypeus, for most part, sparsely, but rather 

 coarsely, punctate ; densely punctate on sides of very front part. 

 Ocelli somewhat below supra-orbital line, but distinctly above nar- 

 rowest part of vertex, the lateral ones somewhat nearer to the margins 

 of the eyes than to each other. Third antennal segment nearly as long 

 as the fourth and fifth taken together; the fifth somewhat longer than 

 the fourth. 



Thorax. — Disc of dorsum clothed with white pile ; otherwise entirely 

 dark brown or black. 



Abdoinen . — Dorsum : segments one and two entirely black ; segment 

 three black, but sometimes with some white hairs on its apical middle; 

 segments four and five clothed entirely with white pile ; segment six 

 mostly dark, but with white pile on the extreme sides. Venter mostly 

 dark. Neither the epipygium nor the hypopygium with a carina. 



Wings. — Only very moderately infuscate, light for a Bonibus queen. 

 The transverse median vein of the fore pair coalescent at the base, for 

 a very short distance, with the base of the discoidal and bent so as to 

 form a slightly obtuse inner angle with both the median and the anal 

 vein. 



Legs. — Clothed with entirely dark pile. Hind margins of hind meta- 

 tarsi unusually arcuate, about as in the Terrestris group. 



Worker. — Like queen, but with no white hair on third abdominal 

 segment and with pile on very base of fourth segment black. 



Male. Head. — Triangular. Pile all dark brown or black. Malar 

 space about two-thirds as long as its width at apex. Clypeus, for 

 most part, rather heavily clothed with pile. Ocelli placed at about 

 one-fifth the distance from the supra-orbital line toward the bases of 

 the antennae, slightly above the narrowest part of the vertex ; the 

 lateral ones separated by about their own diameter from the margins 

 of the eyes. Eyes somewhat swollen, about like those of male ru/o- 

 cinctus. Third and fifth antennal segments subequal in length, the 

 fourth shorter than either. 



Thorax. — Coloration of pile about like that of queen and worker. 



Abdomen. — Dorsum : segments one, two and three dark ; segment 



