158 HYMENOPTERA. 



sparsely and coarsely punctate over the disc ; the corners densely and 

 coarsely punctate. Flagellum of antennse about twice as long as the 

 scape ; the third antennal segment much longer than the fifth, the 

 fourth and fifth subequal in length. 



Thorax. — Anterior part of the dorsum covered with yellow pile, often 

 with a very slight sprinkling of black hairs admixed ; a very broad and 

 well defined black band present between the bases of the wings, its 

 hind border straight or curved backward slightly in the middle ; center 

 of the disc naked ; scutellum covered with yellow pile, mesopleurse 

 yellow to the bases of the legs ; metapleurae clothed with yellow pile ; 

 sides of the median segment usually with dark and yellow pile mixed. 



Abdomen . — Dorsum : segment one yellow ; segments two and three 

 black ; segment four yellow, but often with some black hairs in the 

 very middle ; segment five with considerable black pile in the middle, 

 this very often sprinkling out somewhat strongly through the yellow 

 pile on the sides ; segment six dark. Venter largely dark, but with 

 the sides of the apical margins of the second to the fifth segments in- 

 clusive fringed more or less heavily with yellow hairs ; the middle por- 

 tion of the apical margin of the first segment also often with a yellow 

 fringe. Hypopygium without a median carina. 



IVings. — Somewhat stained with brown; the fore pair darkest along 

 the costal border. 



Legs. — Fore and middle coxae mostly dark ; hind coxae with some 

 yellow hairs on ther outer sides ; fore trochanters mostly dark ; middle 

 and hind trochanters with considerable yellow pile on their lower 

 sides ; fore femora sometimes with a few yellow hairs on their lower 

 sides ; middle femora sometimes entirely dark and sometimes with con- 

 siderable yellow pile on their lower sides ; hind femora always with 

 more or less yellow hair, and sometimes with more yellow than black ; 

 fore and middle tibiae and corbicular fringes dark. 



Worker. — Much like the queen, but often with a strong admixture 

 of black hairs with the yellow on the front part of the dorsum of the 

 thorax ; middle trochanters and hind femora occasionally entirely dark 

 and the hind trochanters sometimes with only a very little yellow pile ; 

 the metapleurae sometimes with considerable dark pile and the sides 

 of the median segment occasionally entirely dark. 



Male. — Face and occiput largely covered with pure yellow pile ; 

 cheeks with much yellow pile, usually connected with the yellow on 

 the occiput. Malar space longer than its width at the apex ; nearly 

 one-fourth as long as the eye. Clypeus mostly covered up with yellow 

 pile. Flagellum of antennae nearly three and one-third times as long 

 as the scape ; third antennal segment somewhat shorter than the fifth ; 

 the fourth shorter than the third. 



Thorax. — Coloration much like that of the queen and worker, but 

 the black interalar band usually distinctly narrower. 



