1921] Wheeler: Tachigalia Ants 165 



only one-third the distance from the eyes to the posterior comers 

 of the head. Thorax broader than the head; mesonotum convex; 

 epinotum rounded, convex, without distinct base and declivity. 

 Petiole thicker, more erect, with much blunter superior border 

 than in the worker. 



Sculpture, pilosity and color as in the worker but the erect 

 hairs are shorter and less abundant on the thorax. Wings 

 distinctly and uniformly infuscated, with strong, dark brown 

 veins and pterostigma. 



Male. Length 1.6-1.8 mm. 



Head through the very large eyes a little longer than broad, 

 with extremely short cheeks, growing narrower behind the eyes, 

 where the sides are nearly straight. Mandibles very small, 

 atrophied, l)luntly acuminate, edentate. Clypeus short, convex 

 in the middle, with broadly and evenly concave anterior border. 

 Scapes very small and short, scarcely more than twice as long 

 as broad, constricted basally, somewhat swollen apically; first 

 funicular joint globose, broader than the scape, succeeding joints 

 somewhat longer than broad, growing successively shorter and 

 narrower, longer at the tip. Thorax shaped much as in the 

 female, but the epinotum more sloping; petiole broader, erect 

 with its superior border blunter than in the worker but more 

 acute than in the female. Legs rather slender. 



Sculpture as in the worker and female; pubescence and 

 especially the pilosity much shorter and sparser; appendages 

 without erect hairs; antennal funiculi beyond the first joint 

 clothed with fine, dense, erect, white hairs. 



Dull, dark piceous brown; head darker; mouthparts and 

 genitalia sordid yellowish. Wings as in the female. 



Described from numerous specimens taken at Kartabo from 

 the petioles of large, vigorous Tachigalia trees. 



This species is so close to Emery's schumanni, that it may 

 prove to be merely a subspecies of that form which was taken 

 on the Rio Guainia, an affluent of the Cassiquiare, in Venezuela, 



