106 AMERICAN HYMENOPTERA. 



the wings. Mesopleura, except their extreme upper parts, clothed with 

 black pile. Each metapleuron with a roore or less noticeable amount 

 of yellow pile at its extreme upper end, just behind and beneath the 

 base of the hind wing, otherwise entirely dark. Sides of median seg- 

 ment with dark pile only. 



Abdomen. — Dorsum : segments one, four, five and six black ; seg- 

 ment two usually entirely black, but sometimes with a little yellow pile 

 on its basal middle ; segment three clothed with yellow pile. Venter 

 dark. Hypopygium without median carina. 



Wings .—Ka.ihev dark, often with slight violaceous reflections. 



Legs. — All dark and with black pile. 



Male. Head. — Face with a strong admixture of pale yellow (whit- 

 ish) hairs with the black, this pale color being somewhat predominant 

 on the clypeus. Occiput with yellow pile strongly predominant over 

 the black. Sides of head mostly dark. Malar space about as in 

 worker. Clypeus mostly covered with pile. Third antennal segment 

 very short, distinctly shorter than either the fourth or the fifth, about 

 one and one-half times as long as the pedicel. All but the basal and 

 apical segments of the flagellum of the antenna appearing more or less 

 strongly arcuate when viewed laterally. 



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



Abdomen. — Dorsum entirely dark, except the third and fourth seg- 

 ments clothed with yellow pile. Venter mostly dark. 



Genitalia. — Handlirsch describes these organs as follows: "The 

 genitalia resemble very much those of Bombus pennsylvanicus and 

 cayennensis , yet are distinctly different from those of both species ; the 

 branch is as slender as in the former species, and the squama and 

 volsella are also entirely as in that species, but the sagittae are as in 

 cayennensis.''^ 



Wings. — About like those of the worker. 



Legs. — Coxse and trochanters with some light pile ; femora and 

 tibiee all dark. Outer sides of hind tibiae convex and slightly im- 

 pressed near the apices; for the most part, evenly covered with short 

 hair, with no long fringes. Hind metatarsi with no long fringes. 



Dim^ensions . — Length : worker, 13 mm. to 16 mm. ; male, about 16 

 mm. Spread of wings : worker, 33 mm. to 38 mm. ; male, about 35 

 mm. Width of abdomen at second segment : worker, 61 mm. to 8 

 mm. ; male, about 7 mm. 



The specie.s is here redescribed from five workers and one 

 male. It seems to be quite constant in its coloration. 



Habitat. — Mexico (Cuernavaca and Tacubaya) and Brazil 

 (Ypanema). All the specimens seen by me came from 

 Mexico, the male being from Cuernavaca. 



This species is evidently closely allied to emilice. All the 

 yellow pile borne by this species is rather deep yellow. 



