330 AMERICAN HYMENOPTERA. 



to naked eye. Malar space wider at apex than long, less than one- 

 fifth as long as the eye ; clypeus moderately and rather coarsely punc- 

 tate ; flagellum of antennae not more than twice as long as the scape ; 

 third antennal segment much longer than fifth, fifth somewhat longer 

 than fourth. 



Thorax. — Anterior part of dorsum covered with whitish-yellow pile, 

 sometimes with a slight admixture of black hairs ; sides of scutellum 

 pale yellow, sometimes with some black hairs intermixed ; a broad 

 black band between the bases of the wings, its posterior border extend- 

 ing backward in the middle across the scutellum ; mesopleura covered 

 with yellow pile for about half the way from the bases of the wings 

 toward the bases of the legs, the lower part being entirely dark ; lower 

 part of metapleura always dark, upper part sometimes dark and some- 

 times yellow ; sides of median segment with black or yellow pile or 

 black and yellow pile mixed. Middle of disc naked, smooth and 

 shining. 



Abdomen . — Dorsum : segment one covered with yellow pile on the 

 sides, but dark and nearly bare in the middle ; segment two covered 

 with ferruginous-red pile, except basal middle, this being black ; seg- 

 ment three covered with ferruginous-red pile ; segment four covered 

 with yellow pile ; segment five entirely black, except the apical margin 

 usually with a fringe of yellow hairs ; segment six black. Venter with 

 apical margins of all the segments, except the first and last, fringed with 

 light yellow hair. Hypopygium without distinct median carina. 



Wings. — Slightly stained with brown ; fore wings darkest on median 

 and submedian cells and about the tip of the radial cell and often also 

 on the region beyond the veins. 



Legs. — Coxae usually entirely black, sometimes with a few yellow 

 hairs at tips ; trochanters occasionally entirely black, but usually with a 

 noticeable amount of light hair on the lower side ; fore femora usually 

 entirely black, at most with but very little light pile at bases; middle 

 femora mostly black, but usually with some light hair at the base on 

 the lower side ; posterior femora almost always with considerable light 

 pile on the basal two-fifths of the lower side and very often with a 

 touch of yellow hair on the outer side near the distal end ; fore and 

 middle tibiae mostly black, but usually with considerable ferruginous 

 hair on hind sides, especially toward the apices ; corbicular fringes 

 always strongly ferruginous, sometimes with black hairs mixed in. 



Worker. Head. — Much like that of queen, but with pile on face and 

 occiput very light, almost white, and sometimes with a slight admix- 

 ture of black hairs. 



Thorax. — Coloration much like that of queen, but the yellow pile 

 very light, almost white, and the pleura often covered with light pile 

 to the bases of the legs ; metapleura often entirely covered with light 

 pile ; sides of median segment usually covered with the same light pile, 

 but sometimes with only dark pile. 



