424 bulletin: museum of comparative zoology. 



lei behind. Antennae rather stout, the scapes slightly thickened 

 towards their tips; second to fourth funicular joints somewhat more 

 slender but scarcely longer than the antepenultimate joints. Maxil- 

 lary palpi moderately long. Pro- and mesonotum, especially the 

 latter, rather convex; mesoepinotal constriction rather deep; epino- 

 tum in profile with subequal base and declivity, both straight and 

 forming a large obtuse angle with each other. Petiole rather narrow, 

 thick at the base with convex anterior and flat posterior surface and 

 very blunt border, which is rounded and entire when seen from behind. 

 Gaster rather large. Legs moderately stout. 



Surface of body distinctly shagreened, shining; clypeus and man- 

 dibles densely longitudinally striate, the latter subopaque and also 

 sparsely punctate. Frontal area very smooth and shining. 



Hairs short, stout, obtuse, pale yellow, abundant, and erect, covering 

 the dorsal and gular surfaces of the head, the thorax, fore coxae, 

 petiole, and gaster; absent on the cheeks and pleurae. Pubescence 

 rather sparse on the gaster, but slightly dimming the shining surface, 

 shorter and less conspicuous on the head and thorax. Femora and 

 tibiae with a row of hairs on the flexor surfaces ; tibiae also with a few 

 short subappressed hairs near the base on the extensor surface. 



Light ferruginous red; mandibles a little darker; gaster if anj^thing 

 a little paler and more yellowish than the thorax. 

 Male. Length 7 mm. 



Mandibles broad, edentate. Head, excluding the mandibles, as 

 broad as long, with convex, broadly rounded posterior border and 

 much rounded posterior corners, short cheeks and very large, convex 

 eyes. Clypeus sharply carinate, with entire, broadly rounded ante- 

 rior border. Thorax and gaster slender. Petiole low and transverse, 

 very thick and very bluntly rounded above; seen from behind its 

 summit is slightly impressed in the middle. Genitalia with the tips 

 of the stipes projecting beyond the volsellae and sagittae. 



Surface of body, including the head and thorax as well as the 

 gaster, shining; mandibles and clypeus more opaque; frontal area 

 smooth and shining. 



Hairs and pubescence grayish, more abundant than in the worker, 

 the hairs of the same length, but the pubescence longer. Eyes and 

 scapes hairless; legs with only a row of erect hairs on the flexor 

 surfaces of the tibiae and femora. Pubescence on the legs much 

 shorter than on the body. 



Black; genitalia fuscous; tips of mandibles and legs beyond the 

 tips of the coxae, yellow; last tarsal joint on each foot and basal por- 

 tion of femora blackish. Wings grayish hyalme, the veins and stigma 

 both of the same brown tint. 



Type locality. — Colorado: Georgetown, (P. J. Schmitt). 

 Alberta: Medicine Hat (J. C. Bradley). 



