324 FROCEEDIMJIS OF THE NATIONAL MUSEUM. vol. xxxi. 



middle; third segment black except for a ferruginous tinge on its pos- 

 terior edge and an encroachment of the same color from the preceding 

 segment on its sides (the amount of ferruginous and its extent varies 

 considerably in ditferent specimens); fourth, iifth, and sixth dorsal 

 plates with a tendency to a median carination; these plates very finely, 

 closel}' punctured, besides a few coarser, scattered punctures; termi- 

 nal plate tinged with brownish or ferruginous; narrow, evenl}' rounded 

 l)ehiii(l; ])eneath; first ventral plate changing from ])lack to pale fer- 

 ruginous; second, third, and base of fourth pale ferruginous; remainder 

 black; sixth and seventh thickly covered with short, dark hairs; last 

 plate small, poorly preserved in the type; in other specimens narrow, 

 with a median notch on the hinder margin, on each side of which the 

 margin is arcuate; posterior margin of fourth and sixth plates broadh' 

 emarginate; the fourth and fifth black, silky sericeous. 



W/'/tf/s. — Uniformly fuliginous with a slight violet reflection; fore 

 wing; third cubital cell nearl}' as long as the radial, which is rounded 

 at its end and more than twice as long as wide; first transverse cubital 

 vein f)ent slightly into the first cubital cell; second cubital cell high, 

 narrow, its ends about equally wide; hind wing; transverse median 

 vein leaving the median at about right angles to the latter but soon 

 bending inward so that as a whole the two veins make less than a right 

 angle with each other; discoidal not interstitial; cubital only slightly 

 developed and for a ver}" short distance beyond the transverse cubital; 

 teguhe black, somewhat ferruginous behind, slightly sericeous. 



Legs. — Black, some parts tinged with ferruginous producing a 

 dark, reddish-brown color; coxtv closely, minutely, and also coarsely 

 punctured; with long black hairs; trochanters the same, except having 

 fewer coarse punctures and hairs; the hinder pair not sericeous, and 

 reddish brown; femora reddish brown, rather sparsely, minutely 

 punctured and with a few coarser punctures and hairs; tibite closely, 

 minutely punctured, sericeous in places in some lights, reddish brown; 

 hind tibia? as long as their femora; the others shorter; the hinder pair 

 strongly brownish sericeous behind; hind tibial spur witli coarse, 

 blunt, spaced teeth on its outer half; tarsi dark brownish s 'riceous; 

 claws blackish at base, ferruginous elsewhere. 



Female. — Difi'ers from the male as follows: Transverse groove 

 behind the ocelli not well marked; mandibles with three teeth; cheeks 

 somewhat broader than in the male; with six long, stout, blunt comb 

 teeth on the fore metatarsus, the first one being often, the least devol- 

 oped; tip of abdomen as in rxijlventTU; petiole a little longer than the 

 second and half the third hind tarsal segments; nearly all of the third 

 abdominal segment ferruginous. 



The amount of ferruginous on the abdomen varies in different 

 specimens, being much more in some than in others. Except for the 

 presence of black, I can find no chai'acters which will separate this 



