1921] Wheeler: Tachigalia Ants 139 



Subfamily Pseudomyrmin^. 



4. — Pseudomyrma damnosa sp.^^nov. 

 (Fig. 13, a-c) 



Worker. Length : 4.5-5 mm. 



Head about one-quarter longer than broad, subrectangular, 

 slightly narrower in front than behind, with feebly and evenly 

 convex sides, and straight or very feebly convex pos- 

 terior border, somewhat flattened above, in profile about three- 

 fifths as high as long. Eyes rather small, only as long as their 

 distance from the anterior border of the head, feebly convex. 

 Mandibles stout, evenly convex, with two large apical and two 

 or three indistinct basal teeth. Clypeus small and very short, 

 convex but scarcely carinate in the middle, depressed on the sides, 

 its anterior border very feebly sinuate in the middle, more 

 strongly on each side. Frontal carinse straight, subparallel, 

 closely approximated, extending back to a line joining the anter- 

 ior orbits. Antennae short and rather slender; scapes scarcely 

 incrassated apically, scarcely more than a third as long as the 

 head, their tips reaching only to the anterior third of the inner 

 orbits ; first funicular joint longer than broad, constricted basally ; 

 joints 2-8 twice as broad as long, 9 and 10 somewhat longer in 

 proportion to their width; terminal joint as long as the two 

 preceding together. Thorax rather robust, shaped much as in 

 latiiioda Mayr and arhoris-sanctie Emery; pronotum with the 

 neck as long as broad, evenly rounded above, concave on the 

 sides but the dorsal surface not marginate laterally. Mesonotum 

 flattened, broader than long, its anterior border strongly arcuate, 

 its posterior border nearly straight. Mesoepinotal constriction 

 deep and abrupt. Epinotum longer than broad, a little broader 

 in front than behind, in profile with the base horizontal and on a 

 level with the pro- and mesonotum, distinctly longer than the slop- 

 ing declivity, into which it passes through an even curve. Petiole 

 from above subtriangular, about one and one-half times as long 

 as broad, with straight sides ; in profile about half again as long 

 as high ; the dorsal outline in profile concave anteriorly, the node 

 evenly rounded and convex above, abruptly truncated behind ; 

 ventrally the surface is nearly straight, at its anterior end with 

 a strong, compressed, acuminate tooth, directed downward but 



