326 bulletin: musetjm of comparative zoology. 



Remainder of body opaque, very densely punctate-reticulate. The 

 tubercles on the head, thorax, petiole, postpetiole, and gaster are 

 small and rather uniformly distributed, noticeably so on the posterior 

 corners of the head and dorsal surface of the gaster. On the front and 

 vertex of the head they are somewhat elongate so that the general 

 effect is that of several frequently interrupted rugae. Tibiae and 

 femora covered with minute, uniformly distributed tubercles. What 

 correspond to the spines and projections on the head and thorax of 

 other species of Trachymyrmex are reduced to tubercles not much 

 smaller than the teeth on the epinotum. 



Hairs yellowish, very short, hooked, moderately abundant but not 

 conspicuous. Pubescence of the same color, short, distinct only on 

 the antennal funiculi. 



Uniformly brownish ferruginous; mandibles a little darker, legs a 

 little paler than the remainder of the body. 



Two specimens; one from Gasparee Island and one from Port of 

 Spain (Thaxter). 



This species is very peculiar in its small size, small petiole, Jarge 

 postpetiole, and the great reduction of the spines and tubercles on the 

 head and thorax. 



39. Acromyrmex octospinosus Reich. ^ . — Gasparee Island (Thax- 

 ter); Ariopita Valley (H. D. Chapman). 



40. Atta cephalotes Linne. S . — Port of Spain and Sewa Valley 

 (Thaxter). 



41. Cryptocerus piisillus Klug. S . — Aripa Savanna (Thaxter). 



42. Cryptocerus (Zacryptocerus) clypeatus Fabricius. ^ . — Sangre 

 Grande (Thaxter); Port of Spain (U. S. N. M.). 



43. Cryptocerus (Cephalotes) atratus Linne. S . — Port of Spain 

 (Thaxter). 



44. Strwnigenys saliens Mayr. U. — Port of Spain (Thaxter). 



Codiomyrmex, gen. nov. 



Worker. Monomorphic, closely related to Strumigenys F. Smith, 

 Epitritus Emery, and Glamyromyrmex Wheeler, but differing in the 

 shap>e of the head. Mandibles large, swollen, triangular, their apical 

 margins with numerous, regular, acute teeth. Clypeus well developed, 

 projecting over the extreme bases of the mandibles and not separated 

 behind by distinct sutures from the head. Frontal carinae widely 

 separated, expanded horizontally and continued backward to form 

 sharp lateral margins as far as the posterior corners of the head, over- 



