MANN: THE ANTS OF BRAZIL. 425 



68. Pseudornyrma rufa F. Smith. 

 Plate 7, fig. 56. 



Worker. Length 6 mm. 



Head, excluding mandibles, a little longer than broad, slightly 

 narrowed behind, with convex sides and straight posterior border. 

 Clypeus strongly keeled at middle; anterior border straight. Man- 

 dibles well developed, the blades finely dentate. Antennae thick; 

 first funicular joint two and a half times as long as broad; apical 

 joint as long as the two preceding. Ocelli distinct, very close together. 

 Pronotum transverse, depressed, strongly margined at sides, with 

 narrowly rounded humeri. Mesonotum longer than broad, the 

 surface with a disc-shaped impression at the posterior half. Meso- 

 epinotal impression shallow. Epinotum more elevated than pro- 

 and mesonotum, margined at sides basally, the surface distinctly 

 concave; declivity as long as base, in profile straight. Petiole in 

 profile elevated behind, above evenly rounded from base to apex, 

 nearly as high as long; from above, more than twice as long as broad, 

 narrowed above, with roundly margined sides and a narrow longitudi- 

 nal impression at middle; an tero ventral surface with a minute tooth; 

 posterior surface concave. Postpetiole from above a little broader 

 than long. Femora slightly thickened. 



Subopaque, granulosely punctate, with very sparse gray pile; 

 pubescence not abundant, poUinose, white. Mandibles finely punc- 

 tate and pilose. 



Color ferruginous, the meso- and epinotum infuscated. 



Female (dealated). Length 7.5 mm. (Plate 7, fig. 56). 



Head, excluding mandibles, one and a third times as long as broad, 

 the anterior and posterior borders of equal width; sides slightly con- 

 vex, posterior border straight. Clypeus keeled at middle, the ante- 

 rior border projecting, with a stout, triangular tooth at middle. 

 Mandibles stout, the blade with a stout, triangular, basal tooth, then 

 three minute teeth and long, pointed apical and subapical teeth. 

 Thorax slender. Pronotum narrower than mesothorax, twice as broad 

 as long, with subparallel, margined sides and narrowly rounded humeri. 

 Petiole seen in profile much as in worker; from above it differs in 

 having the surface flat, and not depressed except at the apex, where 

 there is a deep excavation dividing it into two triangular portions. 

 Sculpture and pilosity much as in the worker; the pubescence of 

 gaster very fine and silky. 



