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-Mamore Camp 

 41. The specimen runs to E. tortiiolosum 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. Edaiomma (Gnamptogcnys) 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 {Gnamptogcnys) sulcatum var. nitens, var. nov. 



Three workers from jManaos 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. 



