3o8 BMlletin American Museum of Natural History, [Vol. XXII, 



from the anterior to the posterior corner, convex. Clypeus short, very flat or 

 sHghtly concave in the middle, with a deep median notch in the anterior border 

 and a distinct median keel. Frontal area carinulate in the middle, concave, 

 fused with the clypeus. Frontal carinfe low, but very long and diverging, ex- 

 tending to within a short distance of the posterior corners of the head and 

 forming shallow scrobes as long as the antennal scapes. Antennae slender; 

 scape curved at the base, very slightly enlarged towards its tip, which reaches 

 half way between the eye and the posterior corner of the head; funicular joints 

 i-S a little longer than broad; three terminal joints subequal, slender, together 

 longer than the remainder of the funiculus. Thorax less than half as broad as 

 the head, hardly broader through the pro- than through the epinotum, con- 

 stricted in the mesothoracic region; pronotum rounded on the sides but with 

 distinct humeri. There is a well-marked transverse depression across the 

 posterior pronotal surface and also a distinct promesonotal depression. 

 Epinotum with two sharp spines directed upward and outward, twice as far 

 apart as long and longer than broad at their bases. The basal and declivous 

 surfaces of the epinotum form almost a continuous sloping surface between 

 the spines. Petiole barely half as broad as the epinotum, ij times as long as 

 broad and distinctly broader in front than behind, with sides slightly concave 

 in the middle; node transverse, in profile high and rather acute, with long con- 

 cave anterior, and short concave posterior slope. Postpetiole more than three 

 times as broad as the petiole, about i^ times as long as broad, with very convex 

 and much rounded dorsal surface and the sides produced in the middle as blunt 

 angles. Gaster about twice as broad as the postpetiole, much smaller than the 

 head. Legs rather long and slender. 



Mandibles smooth and shining, with cf)arse, scattered punctures; on the 

 outer surface near the base with coarse longitudinal rugae. Clypeus shining, 

 longitudinally rugose on the sides. Head subopaque, coarsely, longitudinally 

 and reticulately rugose throughout. Even the antennal scrobes are crossed by 

 rugse. Between the rugae the surface is finely punctate. Pronotum and base 

 of epinotum transversely rugose, the latter more delicately, the remaining 

 surface more irregularly; epinotal declivity and petiole smooth and shining; 

 postpetiole finely reticulate; summit of the node with delicate transverse 

 rug;E. Gaster smooth and shining, except the basal fourth or third of the first 

 segment, which is sharply longitudinally rugose. Legs shining, coarsely and 

 sparsely punctate. 



Body with coarse, yellow, erect hairs, which are especially long and conspic- 

 uous on the head, thorax, pedicel and gaster. There are similar but much 

 more reclinate hairs on the legs, antennae and mandibles. 



Ferruginous brown; head and gaster darker, the latter sometimes paler 

 at the base. Legs, and in some specimens also the thorax and pedicel, yellow. 

 Edges of mandibles and anterior border of clypeus black. 



Worker, (t'late XLL Fig. 9). Length 2.3-2.5 mm. 



Mandibles slender, with two prominent apical and several minute basal 

 teeth. Head, excluding the mandibles, but little longer than broad, elliptical, 

 without posterior corners. Eyes prominent and convex, in front of the middle 

 of the head. Clypeus convex, with a median keel and an entire, broadly 

 rounded anterior border. Frontal carinas rather short, high and far apart. 



