HENRY J. FRANKLIN. 149 



has sent me a male, from Colombia (San Antonio), deter- 

 mined by him as weisi, and I am unable to connect it with 

 any other species known to me. 



Queen. — Unknown. 



Worker. — Friese's description is as follows: " Black, black-haired ; 

 like B. ephippiatus var. lateralis, but larger; segments 1-3 yellow-, 

 4-5 black-, 6 red-haired ; with longer cheeks. Length, 15 mm. ; width 

 of thorax, 1\ mm." 



Male. — The single specimen before me, received from Friese, may 

 be described as follows : 



Head. — Triangular in form. Face covered with a large and rather 

 dense patch of nearly pure yellow pile, this patch extending from near 

 the front margin of the clypeus to considerably above the bases of the 

 antennae and from eye margin to eye margin. Occiput with a patch 

 of mostly yellow pile in the middle, but with numerous black hairs 

 intermixed. Sides of head behind eyes clothed for most part with 

 bright yellow pile. Malar space but little more than half as long 

 as its width at apex. Ocelli large and placed very slightly below 

 narrowest part of vertex, at about one-third of the distance from the 

 supra-orbital line toward the bases of the antennae, the lateral ones 

 separated from the eye margins by about half their own diameter. 

 Eyes considerably swollen, about like those of robustus male. Third 

 and fifth antenna! segments subequal in length, the fourth shorter than 

 either. 



Thorax. — Dorsum clothed for most part with yellow pile, but with a 

 very poorly outlined dark band between bases of wings (this band 

 being made up of a mixture of black and yellow pile, with the black 

 predominating) ; middle portion with large naked area ; front portion 

 of scutellum also naked in middle. Mesopleura covered with bright 

 yellow pile from bases of wings to bases of legs. Metapleura and 

 sides of median segment with mostly yellow pile. 



Abdomen. — Dorsum : segment one clothed with yellow pile ; segment 

 two with mostly yellow pile, but with an inconspicuous amount of 

 black hair on its apical middle ; segments three to seven, inclusive, 

 with black pile. Venter with mostly dark brown or black pile. 



Wings. — Smoky, but not very dark. 



Legs. — Trochanters and femora of middle and hind pair of legs 

 with considerable yellow pile, especially those of the hind pair; front 

 femora with mostly black pile. Tibiae almost entirely dark. Hind 

 tibiae with outer faces slightly convex and sparsely hairy, with front 

 fringes moderate and hind ones long, forming weak corbicuhe. Hind 

 metatarsi fully four times as long as their greatest width, their hind 

 fringes long and dark brown in color. 



Dimensions. — Male: length, 17 mm. ; spread of wings, 37 mm. 



TRANS. AM. ENT. SOC. , XXXIX. 



