MEXICAN FORMICID^. 883 



sparsely punctured, Prothorax without sculpturing, ex- 

 cept faintly so on the neck, the mesothorax smooth above 

 and densely granulated at the sides; metathorax granu- 

 lated above and at the sides. Nodes and abdomen 

 smooth. Erect hairs very sparse. 



Black. Antenna, clypeus and legs brown; teeth of 

 mandibles black or brown; mandibles and tarsi yellow- 

 ish. 



The worker resembles very much in general appear- 

 ance the genus Monomorium, but differs from it in the 

 two-jointed palpi. 



Four soldiers and seven workers. Tepic. 



34. Pheidole floridana Emery, var. deplanata 

 n. var. 



The soldier of this variety differs from the typical form 

 in the somewhat smaller size, the smoother and anteriorly 

 less distinctly emarginate clypeus, more strongly granu- 

 lated thorax, the flattened dorsal surface of the metano- 

 tum and the shorter and stouter thorus. 



The worker is smaller and more strongly granulated. 

 The head, metathorax and end of body dark brown, pro- 

 and mesothorax reddish -brown; antenna, legs, nodes 

 and basal segments of the abdomen brownish-yellow. 



Five soldiers and two workers. Tepic. 



35. Pheidole vaslitii n. sp. 



Soldier: Length, 3,8-4.4 mm. Head somewhat longer 

 than broad, deeply emarginate behind and with a deep 

 median furrow, extending nearly to the clypeus. Cly- 

 peus convex, the anterior margin arcuate and notched at 

 the middle. Antennae rather stout, the scape about two- 

 thirds the length of the head. Mandibles robust and with 

 but two stout teeth at the apex, Pronotum slightly angu- 

 lated at the sides; the mesonotum with a deep and broad 



