MEXICAN FORMICID^. 879 



Thorax polished, its sides and dorsal face of the meta- 

 notum densely granulated, the declivity and channel be- 

 tween the spines finely reticulated or granulated. Sides 

 of first node very finely granulate, the second node with- 

 out sculpturing. Erect hairs quite dense and rather coarse, 

 especially so on the head and abdomen. 



Color dark brown or black. The anterior third of the 

 head, extending between the frontal carinae to about the 

 middle of the head, and sometimes almost the entire sides 

 of the head, the clypeus, mandibles, flagellum, tibicc and 

 tarsi, more or less distinctly reddish-yellow, the scape and 

 femora brownish. Sometimes the entire head, thorax and 

 nodes are reddish; the anterior half or more of the abdo- 

 men yellowish -brown, and legs and antennse yellowish; 

 or the posterior angles of the head and the thorax brown- 

 ish and the legs and antenna reddish. 



Worker: Length, 2.2—2.4 nini- Head longer than 

 broad, the sides arcuated, the occiput rounded, the ver- 

 tex with a faintly impressed median line. Clypeus con- 

 vex and with a slender median carina, the anterior margin 

 arquate. Mandibles of the usual shape, armed with a 

 number of acute teeth. Pronotum convex above and at 

 the sides, prolonged into a neck and without lateral an- 

 gles; there is a rather deep depression across the anterior 

 end of the mesonotum and a deep constriction between 

 the meso- and metanotum ; upper face of metanotum quite 

 flat, the thorus short, stout, acute and about one -fourth 

 the length of the basal section. Nodes of the usual shape, 

 the second node rather small and nearly globular. Legs 

 and antennse rather long and slender. 



Head faintly and indistinctly shagreened, granulated 

 between the eyes and frontal carinee. Sculpture of the 

 clypeus indistinct; mandibles finely striated and sparsely 

 punctured. Thorax densely granulated, the pronotum 

 almost smooth. 



