1921] Wheeler: Tachigalia Ants 149 



behind to the pronounced mesoepinotal constriction. Epinotum 

 small and low, subcuboidal, broader than long, in profile with 

 subequal base and declivity, the former straight and horizontal 

 in profile, the latter very steep and concave, the spines very 

 small and acute, scarcely longer than broad at their bases, 

 directed backward and very slightly upward. Petiole slender, 

 pedunculate, the node at its posterior end abrupt, anteroposter- 

 iorly compressed, its border moderately sharp, transverse and 

 very feebly sinuate in the middle. Postpetiole slightly broader 

 than the petiolar node, transverse, with rounded sides. Gaster 

 oval, about as large as the head, convex above and below. Legs 

 moderately long, with thickened femora and tibis. 



Shining ; mandibles and middle of clypeus smooth, the former 

 with coarse, scattered, piligerous punctures; antennal scrobes 

 reticulate; remainder of head longitudinally rugose, the rugse 

 rather straight and subparallel extending to the posterior cor- 

 ners, the interrugal spaces and posterior part of the head 

 rather loosely reticulately rugose. Pro- and mesonotum smooth 

 and shining above; pleurae and epinotum more opaque, finely 

 reticulate or punctate, as are also the ventral portions of the 

 petiole and postpetiole; the nodes of the latter, the gaster and 

 legs smooth and shining. 



Hairs pale, golden yellow, erect, of uneven length, moderately 

 abundant, rather uniformly covering the dorsal surface of the 

 body. Pubescence almost absent. 



Reddish yellow; gaster and appendages paler yellow, the 

 former with a brown transverse band or cloud on the posterior 

 portion of each segment. Mandibles red, with black borders; 

 clypeal border also blackish. Impression on the vertex with a 

 small, indistinct brown spot. • 



Worker. Length: 1-1.1 mm. 



Head subrectangular, as long as broad, its sides rather 

 rounded, its posterior border feebly but distinctly emarginate in 

 the middle. Eyes rather large, flat, in front of the middle of the 

 head. Mandibles with oblique, indistinctly denticulate apical 

 borders. Frontal area obsolete. Clypeus rather convex in the 



