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, mesoépinotal 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 off. 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, ocellar 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. 
FremMa.e. 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. 
