48 JovRXAL Xew York Entomological Society, t^'o'- x>^ii- 



Described from many specimens taken from a number of colonies 

 nesting beneath stones on the hill sides at Guerrero Mill. This species 

 differs from Ph. viacclendoni in its smaller stature and in the head of 

 the soldier, which in the latter species is proportionally shorter, much 

 more convex above and very differently sculptured. I have named 

 it after the Aztec Ceres, or maize goddess, as it is, in all probability, 

 a harvesting species. Owing to the structure of the head and the 

 polymorphism of the worker phase it may be referred to Forel's sub- 

 genus Allopheidole, which also includes Ph. macclendoni, tepicana 

 Pergande and kingi Em. Andre, the last being the type. Ph. vasliti 

 Perg., which Forel also assigned to this subgenus must evidently be 

 excluded. For reasons given below I make it the type of a new sub- 

 genus, Cardiopheidole. Both of these subgenera, however, seem to be 

 rather artificial and therefore of doubtful value. 



i8. Pheidole (Cardiopheidole) vasliti Pergande var. acolhua new var. 



Soldier. — Differing from the typical form and the var. hirtula Forel in 

 its darker color, the gaster, pedicel, pleurae, epinotum and femora, and in some 

 specimens also the remainder of the thorax and the head, dark brown or black 

 in mature specimens, the cheeks sometimes red or yellowish. 



Mediae and worker. — These are also darker than the corresponding phases 

 of the typical form and var. hirtula, the mediae being piceous or blackish, with 

 red mandibles and cheeks, the worker black, with yellowish mandibles and 

 brownish funiculi, tarsi and articulations of the legs. 



Female. — Length S-g mm. 



Head, excluding the mandibles, subrectangular, a little broader than long, 

 a little broader behind than in front. Anterior clypeal border transverse, 

 flattened, deeply emarginate in the middle. Antennal scapes reaching nearly 

 to the posterior corners of the head, flattened and somewhat incrassated and 

 rather strongly curved at the base. Thorax of the usual shape, with broad, 

 flat mesonotum and sloping epinotum, the latter armed with strong, blunt, 

 laterally compressed teeth. Petiole from above concave on the sides, broadest 

 behind through the node, which is transverse, with a sharp border, excised in 

 the middle and with rather straight sides above. Postpetiole seen from above, 

 about twice as broad as long, with broadly rounded anterior border, its sides in 

 the middle projecting as blunt angles. Gaster broadly elliptical, flattened dorso- 

 ventrally. Wings very long (9-10 mm.). 



Mandibles shining, coarsely and very sparsely punctate. Middle of clypeus 

 and a narrow median line on the head shining, sides of clypeus and remainder 

 of head subopaque, coarsely longitudinally rugose, with reticulate interrugal 

 spaces. Thorax and pedicel subopaque, finely striate and coarsely punctate, 

 middle of the mesonotum, anterior portion of scutellum and gaster shining, 

 covered with scattered piligerous punctures. 



