128 bulletin: MUSEIM OF COMPARATIVE ZOOLOGY. 



than long, its anterior border entire, evenly rounded and slightly projecting. 

 Frontal area distinet, triangular; frontal groove narrow hut distinct; frontal 

 carinae rather approximated, prominent, sinuous, as near together behind 

 as in front. Antennae long; scapes extending more than half their length 

 beyond the occipital border, the basal fimicular joints about 2j times as long 

 as broad. Thorax slender, its dorsal and lateral surfaces flattened, the former 

 strongly marginate on all sides, except at the neck. Promesonotal and meso- 

 epinotal sutures distinct, but not incised where they meet the lateral margina- 

 tions. Dorsum of pronotum as broad as long, with two flat, blunt teeth 

 anteriorly, as long as broad at their bases, directed outwards; dorsum of 

 mesonotum trapezoidal, about Ij times as long as broad, with straight sides, 

 converging posteriorly. Base of epinotum regularly oblong, twice as long as 

 broad, its posterior angles forming two small erect teeth, as large as those on 

 the pronotum but more acute; epinotal declivity shorter than the base, sloping 

 and concave. Petiole from above 1$ times as long as broad, broader in front 

 than behind, bearing above in the middle a long, straight, backwardly directed 

 spine, nearh' as long as the greatest height of the remainder of the petiole, and 

 on each side a triangular tooth, only a little longer than broad at the base and 



somewhat blunter than the median spine. Gaster a little larger than the head, 



oval, broad in front. Legs long; tibiae cylindrical, distinctly constricted at 



the base, without a row of bristles on their flexor surfaces. 



Mandibles slightly shining, very finely striated and finely and sparsely 



punctate; ch-peus, head, thorax, and petiole densely and evenly punctate. 



Gaster and legs very finely and superficially shagreened, the former shining, 



the latter lustrous. 



Hairs very few, short, obtuse, yellowish, confined to the clj'peus, mandibles, 



and tip of the gaster; pubescence extremely fine and dilute, visible only on 



the antennae and tibiae. 



Brownish ferruginous; scapes, legs, and gaster a little paler than the head, 



thorax, and petiole. 



Female (dealated). Length nearly 10 mm. 



Resembling the worker in the shape of the head and petiole. Thorax 

 elongate-elliptical, nearly 2| times as long as broad, narrower than the head; 

 meso- and epinotum not marginate on the sides, the former as broad as long, 

 convex in front, flattened behind; the latter with subequal base and declivity, 

 the base slightly convex and not separated from the sloping, concave declivity 

 by a transverse ridge as in the worker; epinotal teeth stout, short, and blunt, 

 directed upward. Pronotum with the blunt, triangular teeth at the anterior 

 corners not connected by a distinct transverse carina. Median spine of the 

 petiole of rather uniform thickness, with blunt tip. 



Sculpture resembling that of the worker, but the head, thorax, and petiole 

 delicately reticulate-rugose as well as finely punctate. 



Black ; tip of last funicular joint yellowish ; gaster with a slightly reddish tint . 



