140 AMERICAN HYMENOPTERA. 



interalar band. The yellow pile of mexicensis is pale straw- 

 yellow. The ferruginous pile is somewhat variable in shade, 

 but, when the shade is deepest, it is perhaps best described 

 as dark ferruginous. 



Bombiis (Bonil)ias) ramoiiensis new species. 

 Type. — Described from a single male, deposited in the col- 

 lection of the United States National Museum. Type locality, 

 San Ramon (Costa Rica?). 



Malar space very short. Pile rather short and rather fine. Ocelli 

 separated from tnargins of eyes by less than half their own diameters. 

 Third and fifth atitennal segments subeqnal in length. Mostly dark. 

 Yellow or whitish pile present on face, sides of head behind eyes, front 

 part of thoracic dorsum, sctitelluni and first, sixth and seventh dorsal 

 abdominal segments. 



Queen and worker. — Unknown. 



Male. Head. — Rounded. Face, from front margin of clypeus to 

 fully half-way between bases of antennae and ocelli, mostly clothed 

 with yellow pile ; extreme sides of face, close to margins of eyes, how- 

 ever, with dark hair. Ventro-lateral portions of head with a notice- 

 able amount of yellow pile intermixed with the black. Malar space 

 scarcely half as long as its width at apex. Clypeus almost entirely 

 covered with a rather thick clothing of yellow pile. Ocelli large, 

 placed at more than one-third of the distance from the supra-orbital 

 line towards the bases of the antennae ; lateral ocelli removed from 

 margins of eyes by less than half of their own diameter ; space be- 

 tween eyes somewhat narrower above ocelli than at ocelli. Eyes 

 greatly swollen and bulging out from sides of head, the vertex being 

 distinctly depressed between them. Third and fifth antennal seg- 

 ments subequal in length, the fourth distinctly shorter than either. 



Thorax. — Dorsum mostly black, but with a band of yellow pile 

 across the front part (this band reaches down on the mesopleura to 

 somewhat below the level of the bases of the wings) and the scutellum 

 heavily fringed with yellow behind. Mesopleura mostly dark, but 

 with an inconspicuous patch of yellow pile on their lower portion 

 toward the bases of the legs, and with some yellow on their upper por- 

 tion in front (the extension of the yellow band on the front part of the 

 dorsum). Metapleura dark. Sides of median segment mostly dark, 

 but with a slight admixture of pale hairs. 



Abdomen. — Dorsum : segment one clothed mostly with j'ellow pile, 

 but with some dark hair in middle ; segment two mostly dark, but 

 with some yellow hair on basal middle ; segments three and four 

 entirely dark ; segment five mostly dark, but with whitish pile on 

 hind corners ; segments six and seven largely clothed with white pile, 



