MANN: THE ANTS OF BRAZIL. 455 



the middle of the sides of head. Mandibles with two large apical 

 teeth and several fine ones basally. Anterior border of clypeus 

 broadly rounded. Lobes of frontal carinae large, flattened, sub- 

 triangular, the carinae extending back as strong, converging ridges 

 nearly to the occipital corners of the head. Antennal scapes dis- 

 tinctly thickened apically, extending about one third their length 

 past the occipital corners; funicular joints all distinctly longer than 

 broad. Occipital angles with one large, double spine, and anterior 

 to these several small conical tubercles. Preorbital carinae extending 

 backward toward, but not reaching the occipital corners of the head. 

 Vertex with distinct ridges, which converge posteriorly. Lateral 

 spine of pronotum long and stout, the apex excised to form two blunt 

 tips, the anterior of which is higher than the posterior. Median 

 spines very short, conical. Inferior spine two thirds as long as lateral 

 spines, stout, the apex broadly rounded. Mesonotum with two 

 pairs of lateral, subequal, stout spines, about one third the length of 

 the prothoracic spines, strongly denticulate. ISIesoepinotal con- 

 striction rather strongly impressed. Epinotum with subequal base 

 and declivity, meeting at obtuse angle; with a pair of short, blunt 

 spines a little in front of the middle of base; apical spines short and 

 conical. Petiole from above about as broad as long, very abruptly 

 narrowed anteriorly into a short petiole; node with a pair of stout 

 spines. Postpetiole as broad as long, twice as broad as petiole; 

 the posterior border distinctly margined, with a flattened impression 

 anterior to margin and the lateral borders with three strong tubercles, 

 the two anterior short and triangular, the one posterior longer and 

 blunt. 



Gaster suboblong, broadest behind the middle; first segment with 

 prominent lateral ridge. Tubercles small, blunt, few in number. 

 Legs long, rather slender, without tubercles. 



Mandibles faintly shining, with a few hairs; remainder of body 

 opaque and finely granular. 



Hairs ferruginous, sparse, very short, and depressed, except on the 

 ventral surface of gaster, where they are longer and suberect. 



Color ferruginous, the antennae and carinae of front and vertex 

 darker. 



Described from workers taken on the trunk of a palm at Abuna, 

 Rio Madeira. 



Most closely related to T. ocikeri Forel from Sao Paulo, but difYering 

 in the smaller size of the anterior pronotal spines, which in T. ocikeri 

 are much longer than the posterior pair. 



