160 HYMENOPTERA. 



Queen. — Head. — Face and occiput with large patches of pure yellow 

 pile ; cheeks mostly dark, but with a little yellow hair on the ventro- 

 lateral portions. Labrum with tubercle-like areas large and not 

 greatly separated, their margins rounded and summits only moder- 

 ately concave, almost flat ; the shelf-like projection narrow and not 

 very prominent. Malar space distinctly longer than its width at apex; 

 fully one-fourth as long as the eye. Clypeus sparsely and delicately 

 punctate over the disc, almost smooth ; the corners coarsely punctate. 

 Third antennal segment much longer than the fifth, the fifth longer 

 than the fourth. 



Thorax. — Anterior part of dorsum covered with a mixture of black 

 and yellow pile, the region between the bases of the wings entirely 

 black and the scutellum mostly black, but with a slight sprinkling of 

 yellow hairs on its hind margin ; center of disc naked, smooth and 

 shining ; a line of dark pile running forward from the tegula on each 

 side ; mesopleurae entirely covered with yellow pile to the bases of the 

 legs ; metapleurae mostly yellow, but partly dark ; sides of median 

 segment dark. 



Abdouieti. — Dorsum : segment one well covered with yellow pile on 

 the sides, but rather sparsely clothed and with a few dark hairs in the 

 middle ; segment two for the most part well covered with yellow pile, 

 but less densely clothed and with a few black hairs on the basal mid- 

 dle ; segments three and four entirely black ; segment five black at 

 base, but with light ferruginous pile on the apical portion, especiallj' 

 in the middle ; segment six mostly ferruginous, but with some black 

 hairs on the sides. Venter with the apical margins of all the seg- 

 ments, except the basal and apical one, well fringed with light yellow 

 hair. 



Wings. — Somewhat strongly stained with brown ; the fore pair much 

 the lightest across their middle portions. 



Legs. — Trochanters with considerable light pile on their lower sides 

 and the corbicular fringes with some ferruginous hairs Cas seen with 

 a lens), otherwise mostly dark ; the tarsi rather strongly ferruginous. 



Worker. — Much like the queen, but the occiput always and the 

 face sometimes with a strong admixture of black hairs with the yel- 

 low ; the thorax usually with a somewhat stronger sprinkling of yellow 

 hairs on the hind margin of the scutellum than in the case of the 

 queen ; sometimes with no line of dark pile running forward from the 

 tegula; metapleurae sometimes mostly dark, and sometimes mostly 

 yellow ; sides of median segment usually with a sprinkling of yellow 

 hairs ; first dorsal abdominal segment yellow only on the sides, dark 

 and sparsely clothed in the middle ; second dorsal segment sometimes, 

 as in queen, but usually with a noticeable median triangle of black 

 pile, the base of the trangle being on the front margin and its apex 

 reaching backward across the hind margin ; the dorsum of the abdo- 



