720 Bulletin American Museum of Natural History. [Vol. XXIII, 



corners. Eyes moderately convex, near the middle of the head. Mandibles small, 

 5-toothed. Clypeus short on the sides, with a triangular median portion which has 

 a rounded, raised and entire anterior border. Behind it is wedged in between the 

 frontal carinae which are dilated in front to form two large horizontal lobes impressed 

 in the middle, rounded on the sides, bluntly angular in front and separated at the 

 level of the eye by a reentrant angle from the posterior ridges. These diverge and 

 extend to the posterior corners of the head where they meet the postorbital ridges 

 and form with them rounded ear-like lobes. Each postorbital ridge is furnished 

 with a blunt but distinct tooth just behind the eye. The frontal and postorbital 

 ridges enclose a deep groove for the accommodation of the antennal scape. Vertex 

 of head with a pair of low, rounded elevations. Antennal scapes robust, thickened 

 towards their tips which extend a little beyond the posterior corners of the head; 

 funiculi slender at the base; joints 2-8 slightly broader than long. Pronotum with 

 four blunt protuberances above in a transverse row, the lateral pair larger and more 

 angular, the inner pair small and closer together than to the lateral pair. Meso- 

 notum a little longer than broad, broader in front than behind, on each side with a 

 blunt ridge, nearly interrupted in the middle so that in certain lights the mesonotum 

 seems to bear two pairs of blunt, elongated elevations. Mesoepinotal constriction 

 very short and rather deep. Epinotum with a convex base, which is considerably 

 shorter than the sloping, flattened declivity, and with a pair of anteriorly converging 

 ridges. The spines are represented by very small, blunt elevations at the posterior 

 ends of these ridges. Petiole somewhat more than twice as broad as long, flattened 

 above, with rounded sides, only f as broad as the postpetiole, which is twice as broad 

 as long, convex in front and with a feeble excision in its posterior border. In front 

 of this excision there is a distinct elongate median depression. Gaster suboblong, 

 somewhat longer than broad, with a veiy short and indistinct median depression 

 at the anterior border. Legs long and stout; hind femora bent and angularly 

 dilated near the base on the flexor side. 



Opaque throughout; mandibles veiy finely and densely striated; remainder of 

 body minutely granular. 



Hairs white, short, scale-like, appressed and uniformly distributed, more slender 

 on the legs than on the body. Pubescence very fine, whitish, confined to the man- 

 dibles and funiculi. 



Very dark brown, upper surface of head and gaster black, anterior portions of 

 the frontal lobes, antennal scapes and tibiee dark brown; remainder of legs, funiculi 

 and mandibles light brown. 



Female. Length: 2.2-2.4 mm. 



Head very similar to that of the worker. Pronotum with pointed inferior 

 angles at the coxal insertions, and above with a pair of blunt angular projections 

 which are as broad at their bases as long. Mesonotum anteriorly with a longitudinal 

 median depression and distinct Mayrian furrows, so that its surface is separated 

 into four slightly convex, elongated areas, two anterior and two posterolateral. 

 Epinotum with very short, convex base and long, abrupt and concave declivity; 

 spines blunt, laterally compressed, shorter than broad at their bases. Scutellum 

 flattened, broader than long; its posterior margin excised in the middle and pro- 

 duced as a broad tooth on each side. Pedicel, gaster and legs similar to those of the 

 worker, but the postpetiole nearly three times as broad as long, with nearly straight 

 posterior border. 



