326 BULLETIN: MUSEUM 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, large 
postpetiole, and the great reduction of the spines and tubercles on the 
head and thorax. 
39. Acromyrmex octospinosus Reich. 8 .— Gasparee Island (Thax- 
; ter); Ariopita Valley (H. D. Chapman). 
40. Atta cephalotes Linné. 8.— Port of Spain and Sewa Valley 
(Thaxter). 
41. Cryptocerus pusillus Klug. 8 — Aripa Savanna (Thaxter). 
42. Cryptocerus (Zacryptocerus) clypeatus Fabricius. 8 .— Sangre 
Grande (Thaxter); Port of Spain (U. S. N. M.). 
43. Cryptocerus (Cephalotes) atratus Linné. 8 .— Port of Spain 
(Thaxter). 
44. Strumigenys saliens Mayr. 8.— Port of Spain (Thaxter). 
Codiomyrmex, gen. nov. 
Worker. Monomorphic, closely related to Strumigenys F. Smith, 
Epitritus Emery, and Glamyromyrmex Wheeler, but differing in the 
shape 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- 
