MEXICAN FORMICIDyE. 863 



first abdominal segment rather dense, long and fine; pu- 

 bescence of the antennge and legs shorter and semi-erect; 

 that of the scape intermixed with a few longer, erect 

 hairs. 



Color black, the abdomen with a slight bluish reflec- 

 tion. Head, in front of insertion of antennge, including 

 the clypeus and anterior part of face between the frontal 

 caringe, cherry -brown, the brown color extending ob- 

 liquely to the lower external angle of the base of the man- 

 dibles; scape, first joint of the flagellum and joints two to 

 four of the tarsi somewhat paler brown; posterior margin 

 of the segments of the abdomen somewhat yellowish in a 

 certain light. 



Small worker: Length, 5.4 mm. Head slightly longer 

 than t>road, broadest just behind the eyes and slightly 

 narrower towards the mouth; the occiput rounded; cly- 

 peus broadest in front and with a distinct median carina; 

 the frontal area more distinct, the eyes larger and more 

 convex and the antenna longer and more slender than in 

 the large worker. Head and thorax opaque, the sculp- 

 turing as in the large worker, except that the clypeus is 

 not rugose ; the abdomen is more distinctly polished and 

 ■the bluish reflection more pronounced, the surface faintly 

 but densely wrinkled. Pubescence similar to that of the 

 large worker, though longer and denser on the head, 

 coarsest in front of the antenna and sides of the head. 



Color entirely black, excepting the flagellum and tarsal 

 joints, which are darker or lighter brown. 



Two large, fifteen sinall workers. Tepic, Mexico. 



This species resembles very much Camf. novogran- 

 adense, differing from it, however, in the larger and 

 broader head and darker and differently distributed brown 

 color and denser pubescence of the large worker, and the 

 entirely black head of the small worker. It seems also 



