1921] Wheeler: Tachigalia Ants 153 



strongly carinate on each side. Promesonotal suture feeble; 

 mesoepinotal suture distinct, but very short. Epinotum very 

 short, sloping between the spines, which are slender, straight and 

 acute, a little longer than the sides of the base, much shorter than 

 their distance apart and directed backward and slightly upward. 

 Petiole oblong, a little longer than broad, with parallel sides, 

 constricted at the anterior end, the posterior corners projecting 

 as minute tubercles. In profile it is about one and one-half times 

 as long as broad, with very feebly convex dorsal and ventral 

 surfaces and without a distinct anteroventral tooth. Postpetiole 

 small, broader than long, the node entire, anteroposteriorly com- 

 pressed. Gaster elongate triangular, tapering and pointed 

 posteriorly, concave dorsally, convex ventrally, the anterior 

 border of the first segment straight and transverse. 



Shining: mandibles smooth, with a few small, scatterea 

 punctures. Head very smooth and shining, cheeks indistinctly 

 striolate-reticulate. Clypeus with two sharp, longitudinal rugae 

 on each side, smooth and .shining in the middle. Pronotum with 

 a few longitudinal rxigse on the disc, abbreviated behind; meso- 

 notum and epinotum subopaque, regularly and evenly reticulate, 

 except the most posterior portion of the latter, which is smooth 

 in the middle; pronotum on the sides, petiole and gaster smooth 

 and shining; postpetiole with short longitudinal furrows above. 



Hairs whitish, long, sparse, rather blunt but not clavate 

 on the dorsal surface of the body; anterior surfaces of antennal 

 scapes with a row of long, rather flexuous hairs. On the legs 

 the hairs are very short, appressed and rather sparse. 



Piceous brown ; head and gaster darker ; base of scape and 

 of funiculus paler ; mandibles and tarsi brownish yellow. 



Female (dealated). Length 4.7 mm. 



Head subrectangular, nearly as broad as long, and nearly 

 as broad in front as behind, with rounded posterior corners and 

 straight, parallel cheeks. Eyes at the middle of the sides, 

 elongate. Antennal scapes scarcely reaching to the posterior 

 corners of the head. Thorax from above elongate elliptical, 

 decidedly narrower than the head ; mesonotum one and one-third 

 times as long as broad ; epinotum abrupt, without base or 



