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 four 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 ldrge, 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. 
