466 bulletin: museum of comparative zoology. 



Antennae rather slender, scapes but slightly enlarged toward their tips, 

 joints 2-4 of the funiculus decidedly longer and more slender than the 

 penultimate joints. Frontal area semicircular, broader than long, 

 frontal carinae distinctly diverging behind. Pro- and mesonotum 

 convex, mesoepinotal constriction narrow and rather deep, epinotum 

 rounded, its base convex. Petiole narrow, its anterior surface convex, 

 its posterior surface more flattened, with entire, blunt border, project- 

 ing upward in the middle in some specimens, in others evenly rounded 

 or even slightly excised. 



Body opaque, finely shagreened. Mandibles opaque and finely 

 striated apically, smooth and shining at the base. Clypeus opaque, 

 very finely striated. Frontal area smooth and shining. 



Entire insect, including appendages, covered with microscopic 

 gray pubescence, dense and most distinct on the gaster. Hairs 

 pale yellow, erect, and, except on the mandibles, distinctly clavate, 

 with obtuse tips. These hairs are sparse on the clypeus, on the front, 

 where they form four longitudinal rows as far back as the ocelli, on 

 the thoracic dorsum, coxae, border of the petiole, and surface of the 

 gaster. On the last they are particularly conspicuous on account of 

 their equidistant arrangement and contrasting color. They are easily 

 rubbed ofl^. A few hairs are occasionally present on the gula but usu- 

 ally entirely absent. Anterior border of scape with a row of delicate, 

 suberect, tapering hairs. Tibiae covered with very short, stiff, sub- 

 erect hairs. Eyes hairless. 



Head, thorax, and petiole deep yellowish red, mandibles and clypeus 

 somewhat darker, ©cellar region often fuscous. In small workers the 

 front, vertex, thoracic dorsum, and petiole are spotted with black. 

 Gaster black, with only the anal region yellowish. In the largest 

 workers the legs are red throughout, in intermediates the femora and 

 tibiae are brownish, in the smallest workers the infuscation extends 

 also to the coxae. Antennae red, funiculi more or less infuscated 

 toward the tip. 



Female. Length 4-4.5 mm. 



Head resembling that of the worker. Thorax distinctly narrower 

 than the head. Petiole narrow, thick at the base, both its anterior 

 and posterior surfaces alike convex, its dorsal border sharper than in 

 the worker; seen from behind variable, in some specimens evenly 

 rounded, in others somewhat produced upward in the middle. 



Sculpture like that of the worker. Whole insect, including the 

 antennae and legs, clothed with delicate white hairs, which are longer 

 and more abundant than in the worker and not clavate though obtuse. 

 These hairs are conspicuously long and suberect on the front, gula, 

 thorax, petiolar border, gaster, antennal scapes, and legs. In addi- 

 tion to these hairs the body and appendages are invested with micro- 

 scopic, white pubescence. 



