342 AMERICAN HYMENOPTERA. 



strongly admixed; cheeks dark. Labrum with tubercle-like areas hav- 

 ing their posterior (proximal) margins rounded and their summits flat 

 or slightly concaved ; the surface between these areas and above the 

 shelf-like projection rather deeply excavated ; the shelf-like projection 

 rather narrow and not prominent. Malar space fully as long as its width 

 at the apex, about one-fourth as long as the eye. Clypeus coarsely, 

 though somewhat sparsely, punctate over the disc. Third antennal 

 segment longer than the fifth, the fifth longer than the fourth; flagel- 

 lum about twice as long as the scape. 



Thorax. — Anterior part of dorsum covered with rather light yellow 

 pile ; a moderately broad black band between the bases of the wings, 

 its hind border extended backward somewhat onto the middle of the 

 scutellum ; the scutellum covered, for the most part, with rather pale 

 yellow pile ; each tegula with an indefinite line of black pile running 

 forward from it to the anterior margin of the thorax ; mesopleura 

 largely covered with yellow pile, but their lower portions dark, the 

 yellow not reaching the bases of the legs ; metapleura mostly clothed 

 with dark pile, but with a slight admixture of yellow hairs ; sides of 

 the median segment mostly dark, but with some light hairs. 



Abdomen. — Dorsum: segment one clothed with rather pale yellow 

 pile, sparsely so in the middle; segments two and three covered with 

 ferruginous-red pile, but sometimes with black hair on the base and 

 extreme sides ; segment four rather pale yellow, but sometimes with 

 some dark pile on the middle ; segment five dark, but sometimes 

 with some light hairs on the sides ; segment six dark. Venter mostly 

 dark. 



fFz«^5.— Somewhat stained with brown, but almost light enough to 

 be called subhyaline. 



Legs. — Mostly dark ; the posterior femora sometimes with consider- 

 able light pile ; the corbicular fringes dark ; the fore and middle tibiae 

 on the type specimen with considerable ferruginous pile on their hind 

 sides. 



Worker. — Much like the queen, but with the face very often entirely 

 dark and the fifth dorsal abdominal segment sometimes entirely 

 covered with yellow pile ; mesopleura usually covered with light yel- 

 low pile to the bases of the legs, but occasionally mostly dark ; tegulae 

 usually with no line of dark hairs running forward from them ; meta- 

 pleura and sides of the median segment very often mostly clothed with 

 light pile ; the corbicular fringes often tinged considerably with light 

 ferruginous ; the middle femora and the middle and hind trochanters 

 often with a sprinkling of light hairs, the hind trochanters often hav- 

 ing a large amount of it on their lower sides. 



Male. Head. — Face with a strong tuft of yellow pile running down 

 from the bases of the antennae and nearly covering the clypeus, the 

 coloration otherwise being much like that of the females. Malar space 



