366 AMERICAN HYMENOPTERA. 



on the basal margin of the segment and its apex on the apical margin, 

 the remainder of the segment bearing yellow pile ; segment three black, 

 but sometimes with the apical margin, and often with the extreme side 

 margins, fringed somewhat with yellow hairs ; segments four, five and 

 six entirely black. Venter with the apical margins of the segments 

 fringed more or less with yellowish hairs, especially on the sides. 

 Hypopygium with a distinct median carina on its apical portion. 



Wings — Not very deeply stained with brown ; the fore pair with 

 the veins noticeably darker than the membranes. 



Legs. — Mostly dark. The middle and hind trochanters sometimes 

 with considerable light pile on their lower sides. 



Worker. — Much like the queen, but usually with considerably lighter, 

 subhyaline wings ; head very often entirely dark ; mesopleura usually 

 entirely covered with yellow pile to the bases of the legs ; metapleura 

 often mostly clothed with yellow pile ; abdomen with dorsal segments 

 one and two usually having little or no dark pile in the middle. 



Male. Head. — Triangular. Face with some yellow pile mixed with 

 the black above the bases of the antennae, below the bases of the an- 

 tennae heavily clothed, for the most part, with pure yellow pile ; occiput 

 with a triangular patch of pure yellow pile ; ventro-lateral parts bear- 

 ing a considerable amount of yellow hair. Malar space distinctly 

 longer than its width at the apex, about one-third as long as the eye. 

 Clypeus mostly covered up with yellow pile. Third antennal segment 

 somewhat longer than the fifth, the fourth much shorter than either. 



Thorx. — Clothed with yellow pile, except for a rather narrow black 

 interalar band, the black pile from this band extending back consider- 

 ably onto the middle of the anterior portion of the scutellum. 



Abdomen. — Dorsum : segment one entirely covered with yellow pile; 

 segment two clothed with yellow, but with a slight admixture of black 

 hairs in the middle ; segment three black ; segment four mostly black, 

 but with a strong admixture of ferruginous hairs ; segments five, six 

 and seven entirely dark. Venter clothed, for the most part, with yellow 

 hair. 



Wings — About like those of the worker. 



Legs. — Coxae, trochanters and femora all with a large amount of 

 yellow pile ; fore and middle tibiae with considerable ferruginous hair 

 on their hind sides, especially toward their tips ; outer faces of hind 

 tibiae somewhat convex, the fringes long and mostly light ferruginous; 

 posterior metatarsi with moderately long ferruginous hind fringes. 



Dimensions . — Length : queen, 13 mm. to 16 mm. ; worker, 9 mm. 

 to 11 mm.; male, 13 mm. Spread of wings: queen, 32 mm. to 34 

 mm. ; worker, 19 mm. to 22 mm. ; male, 27 mm. Width of abdomen 

 at second segment : queen, S\ mm. to 9 mm. ; worker, 4^ mm. to 

 5 mm. ; male, 6| mm. 



Redescribed from eight queens, many w^orkers and one 

 male. 



