wheeler: myrmicine ants from brazil. 485 



convex, its posterior corners produced as prominent angular tubercles. 

 Scrobes of nearly uniform transverse diameter throughout their length 

 and sufficiently deep to accommodate the antennae. Frontal carinae 

 expanded and lobular anteriorly, with translucent and slightly reflected 

 borders throughout their length. Mandibles rather large, with mod- 

 erately convex external borders, the apical borders rather oblique, 

 with fom- subequal teeth. Clypeus with evenly rounded, entire 

 anterior border, flattened in the middle between the two prominent 

 longitudinal carinae and transversely impressed at the anterior border. 

 Frontal area semicircular. Antennae slender, scapes reaching nearly 

 to the posterior corners of the head, their apical halves distinctly 

 thickened; first funicular joint large, fully twice as long as broad; 

 joints 2-7 narrower, a little broader than long, joint 8 as long as broad; 

 joint 9, the basal joint of the clava, longer than broad and twice as 

 broad as the preceding joints; terminal joint large, pointed, nearly 

 three times as long as broad. Thorax narrower than the head, more 

 than twice as long as broad, broadest through the humeri, in profile 

 more than twice as long as high, feebly and evenly convex above. 

 Pronotum with acute, dentate anterior corners, from which there run 

 a pair of distinct longitudinal ridges, gradually converging posteriorly 

 to the epinotal spines. Each of these ridges bears two minute teeth. 

 Epinotum sloping, concave in the middle, marginate on the sides be- 

 low the spines, which are long, straight, acute, close together at their 

 insertions and directed backward, outward and upward. Metasternal 

 angles thin, translucent, broad and sharply angular above. Petiole 

 fully three times as long as broad or high, with a short distinct peduncle 

 in front and constricted behind the node, which is evenly and feebly 

 convex above; seen from above the segment is broadest at its posterior 

 margin. Postpetiole a little broader than the petiole but scarcely 

 higher, from above rectangular, a little broader than long, in profile 

 feebly convex above. Gaster subcircular from above, with straight 

 basal margin. 



Gaster smooth and shining; remainder of the body, including the 

 appendages opaque, very finely and densely punctate-rugulose. Head 

 above between the frontal carinae with six coarse, longitudinal rugae 

 connected by sparse, indistinct transverse rugules or reticulations. 

 Pronotum above with four feeble longitudinal rugae. Pleurae very 

 indistinctly and irregularly rugose. Petiole and antennal scapes 

 indistinctly longitudinally rugulose. Postpetiole and legs very finely 

 and densely punctate. Gaster very finely and indistinctly shagreened, 

 at the base above densely punctate and opaque. 



