426 bulletin: museum of comparative zoology. 



Worker. Length 4-9 mm. 



Resembling jP. sanguinea. Body rather robust. Head subrec- 

 tangular, about as long as broad, a little narrower in front than behind, 

 with straight posterior and very feebly convex lateral borders. Man- 

 dibles 8-toothed. Clypeus strongly carinate, with entire anterior 

 border. Antennae rather stout, penultimate much thicker and shorter 

 than the basal funicular joints. Pro- and mesothorax very convex, 

 hemispherical. Mesoepinotal constriction pronounced; epinotum 

 shaped much as in sanguinea, but more rounded and less angular. 

 Petiole broad, compressed anteroposteriorly, with a sharp border, 

 which is entire or feebly emarginate in the middle. Gaster large, 

 broadly elliptical, legs long and robust. 



Body opaque; mandibles shining, finely striatopunctate; frontal 

 area glabrous and shining. Gaster glossy or feebly shining. 



Pubescence fine and abundant; suberect hairs short, usually very 

 sparse on the head and thorax, more abundant on the gaster. Gula 

 almost always with a few erect hairs; eyes hairy. Tibiae with only 

 a few minute slanting hairs in addition to the row of bristles on the 

 flexor surfaces. 



Dark or pale red ; front, vertex and antennae dark brown to blackish 

 brown; clypeus sometimes with a median longitudinal brown streak; 

 pronotum usually with a small brown or black spot not reaching the 

 posterior border of the segment; gaster blackish brown, its base some- 

 what reddish. 



Female. Length 9-11 mm. 



Similar to the worker. Head and thorax opaque, but gaster very 

 smooth and shining. Erect hairs short and sparse, absent on the 

 gaster. Pubescence fine, most distinct on the legs and scapes. Red; 

 front, vertex, mesonotum, the anal region, spots on the pleurae, tibiae, 

 tarsi, tips of femora, middle of clypeus, and gaster, with the exception 

 of its base, dark brown or black. Mandibles dark red, subopaque, 

 coarsely striatopunctate. Wings slightly infuscated, with light 

 brown veins and stigma. 



Male. Length 9-11 mm. 



Body stout. Head rather small, mandibles edentate or very rarely 

 dentate; masticatory border sharp, with apical point. Clypeus 

 carinate, convex, with entire, angular anterior border. Petiole thick, 

 its anterior and posterior surfaces flattened and its superior border 

 very blunt, rounded and feebly excised in the middle. 



Body, including the frontal area, opaque, upper surface of gaster 

 shining. 



Erect hairs black and dense on the head and thorax, sparse on the 

 eyes and petiole, almost absent on the gaster. 



Black; genitalia, and legs, except the bases of the femora, yellowish 

 or brownish red. Wings like those of the female. 



