462 AMERICAN HYMENOPTERA. 



female entirely dark ; that of the male quite variable Wings rather 

 dark brown. Malar space of female distinctly shorter than its width at 

 apex. 



Female. Head. — Face often with a sprinkling of yellow hairs above 

 the bases of the antennae ; otherwise dark, except for a large triangu- 

 lar patch of yellow pile on the occiput and even this yellow patch 

 usually with at least a slight admixture of dark hairs. Malar space 

 somewhat shorter than its width at the apex, about one- fourth as long 

 as the eye. Clypeus coarsely punctate. Flagellum of antenna about 

 one and four-fifths times as long as the scape ; third and fifth an- 

 tennal segments subequal in length, the fourth distinctly shorter than 

 either. 



Thorax. — Dorsum mostly covered with yellow pile. The disc, be- 

 tween the bases of the wings, always dark and thinly clothed, this 

 dark and thinly clothed area extending back onto the scutellum in 

 the middle. The dark color of the hair on the disc often extending 

 to the base of the wing on each side so as to form a poorly defined 

 dark interalar band. Mesopleura entirely covered with dark pile from 

 slightly below the level of the bases of the wings. Metapleura and 

 sides of the median segment dark. 



Abdomen. — Dorsum and venter both dark, except for brownish-ferru- 

 ginous pubescence on the apex of the last segment. 



Wings. — Rather dark brown ; the fore pair usually lightest across 

 their middle portions. 



Legs. — Dark. Hind metatarsi much as in laboriosus and insularis. 



Male. Head. — Dark, except for a triangular patch of yellow pile 

 on the occiput, this patch with at most only a slight admixture of dark 

 hairs. Malar space shorter than its width at the apex, about one-fifth 

 as long as the eye. Clypeus covered with black pile. Flagellum of 

 antenna about three and one-fourth times as long as the scape ; fifth 

 antennal segment much longer than the third, the third longer than 

 the fourth. 



Thorax. — Dorsum with pile colored much like that of queen, but 

 usually with a distinct black band between the bases of the wings. 

 Mesopleura usually about like those of the queen, but with the yel- 

 low pile sometimes running down for some distance below the bases 

 of the wings. Pile of metapleura and sides of the median segment 

 dark. 



Abdomen. — Dorsum : segment one usually entirely dark, but often 

 with a more or less strong admixture of yellow hairs especially toward 

 the sides; segment two usually entirely dark, but occasionally with a 

 touch of yellow pile near the hind margin on the sides (one specimen 

 before me has this segment very largely clothed with yellow pile, only 

 its anterior corners and its anterior margin in the middle being dark); 

 segment three mostly dark, but with considerable yellow pile on the 



