MANN: THE ANTS OF BRAZIL. 407 
above without sutures. Prothorax rounded above in front and at 
sides. Epinotum in profile nearly straight at base, the declivity 
sloping gradually. Petiole longer than broad, broadest behind, with 
rounded posterior border, straight sides and straight, margined 
anterior border, the corners of which project angulately; in profile 
higher than long, rounded above. Gaster short and thick. Legs 
rather slender. 
Head shining, longitudinally striate, the striae coarse and regu- 
lar, becoming oblique at sides, perpendicular on cheeks; the 
intervening ridges rounded. Thorax shining, sculptured similarly 
to head; the prothoracic striae longitudinal at middle, arcuate at 
sides, forming a somewhat concentric pattern. Striae of epinotum 
transverse at middle, obliquely longitudinal at sides. Petiole con- 
centrically striate. Gaster subshining, the first two segments longi- 
tudinally striate. 
Head, body, and legs with abundant, rather fine erect hairs. 
Color piceous, legs and antennae fuscous. 
The specimen before me has the antennae mutilated. 
Described from a worker found dead, at Madeira-Mamoré Camp 
41. The specimen runs to E. tortuolosum in Emery’s key to the 
species, and answers to Smith’s very superficial description, but 
differs from the form considered as this species by Emery (Studi sulle 
formiche della fauna Neotropica. Bull. Soc. ent. Ital., 1896, 28, p. 51) 
in the structure of the petiole, which forms an acute angle above in 
profile in E. tortuolosum. It is doubtful whether this or Emery’s speci- 
men (which came from Para) belongs to Smith’s species. 
16. Ectatomma (Gnamptogenys) sulcatum (F. Smith). 
Several workers and females from Porto Velho. The striae extend 
the entire length of the thorax; those of the node and first gastric 
segment are also longitudinal, but slightly arcuate on the sides. ' The 
color is bright ferruginous, with the head black and the mandibles 
pale yellow. 
17. Ectatomma (Gnamptogenys) sulcatum var. nitens, var. nov. 
Three workers from Manaos and Independencia. 
In form and sculpture this variety is identical with the typical form, 
but is entirely black in color, except the mandibles which are yellow. 
