88o CALIFORNIA ACADEMY OF SCIENCES. 



Erect hairs fine and sparse, slightly more dense on the 

 scape and abdomen. 



Polished; black or dark brown; mandibles and tarsi 

 yellowish. 



Ten soldiers, twenty-five workers. Tepic. 



The worker resembles very much that of Pheidole coni- 

 muiata Mayr, but differs from it in the less strongly con- 

 stricted suture between the meso- and metanotum, the 

 longer metanotum and its thorus and smaller second node; 

 the soldier has a much longer head and entirely different 

 sculpturing. 



32. Pheidole rugifrons n. sp. 



Soldier: Length, 3.4— 3.8 mm. Head very large; much 

 longer and broader than the thorax; its sides parallel, the 

 posterior angles rounded, the occiput deeply emarginate 

 and with a deep furrow extending to the clypeus. Cly- 

 peus short, convex, its posterior angle extending far be- 

 tween the antennas, the posterior margin deeply emargin- 

 ate each side, arcuate in front and deeply emarginate at 

 the middle. Antennge very short, the scape not reaching 

 to the middle of the head. Mandibles very robust and 

 with one or two blunt teeth at the apex. Thorax rather 

 deeply constricted between the meso- and metanotum, 

 the latter with two short and stout, acute and erect spines; 

 the declivity concave; pronotal angles obtusely rounded. 

 Upper edge of first node straight or slightly concave ; 

 second node transverse, broader than long, with the lat- 

 eral angles obtusely rounded. 



Head, semi -opaque and densely reticulate -striate, the 

 reticulation somewhat longitudinal in front and more or 

 less distinctly transverse on the occiput; space between 

 the frontal carinas and the clypeus longitudinally striate. 

 Mandibles polished, coarsely and sparsely striated and 

 sparsely and coarsely punctured. Pro- and mesonotum 



