WHEELER: ANTS COLLECTED IN TRINIDAD. 325 
34. Mycocepurus smithi Forel. 8 — Diego Martin (Urich). 
35. Apterostigma wasmanni Forel. 8 .— Four Roads, Port of Spain 
(Thaxter); “from fungus garden under a log.” 
36. Apterostigma uricht Forel. 8.— Caparo (Thaxter); “from 
fungus garden under a log.” 
37. Trachymyrmex uricht Forel. 8.— Ariopita Valley (H. D. 
Chapman); Gasparee Island (Thaxter). 
38. Trachymyrmex humilis, sp. nov. 
Worker. Length 2.2-2.5 mm. 
Mandibles rather long, with concave external borders, three large 
apical and several smaller basal teeth. Head subrectangular, as 
broad as long, with broadly and feebly excised posterior and rather 
convex lateral borders and rounded posterior corners. Eyes moder- 
ately convex. Clypeus short, with nearly straight, entire anterior 
border. Expanded anterior lobes of frontal carinae moderately large, 
rounded, not angular, posterior ridges diverging but not reaching the 
posterior corners of the head. Praeorbital carinae straight, not curved 
inward across the antennal scrobes, terminating a little behind the eyes. 
Antennal scapes moderately stout, reaching a distance not exceeding 
their greatest transverse diameter beyond the posterior corners of the 
head. Joints 2-8 of the funiculi not longer than broad, two terminal 
joints forming an indistinct club, the penultimate longer than broad 
and half as long as the last joint. Thorax with the pro- and mesono- 
tum rather convex and rounded in profile, the mesoépinotal constric- 
tion short and deep. Inferior pronotal spines short, moderately 
acute. Epinotum much higher than long, the base in profile very 
convex anteriorly, sloping behind, broadly suleate above, somewhat 
longer than the declivity, the spines reduced to two teeth which are 
only slightly longer than broad at their bases, directed upward, out- 
ward, and backward. Petiole small, not longer than high, the node 
feebly developed, acute in profile, with longer concave anterior and 
short concave posterior slope. Postpetiole very large, more than twice 
as broad as the petiole, as long as broad, broadest behind, with a 
median semicircular impression at the posterior border; in profile 
the node is very convex and high in front, the remaining dorsal surface 
flattened. Gaster suboblong, with rounded anterior and posterior 
corners, a little longer than broad, with straight, marginate sides, its 
upper surface evenly and feebly convex, without any longitudinal 
impressions. Legs moderately long. 
Mandibles shining, with a few very coarse, elongate punctures. 
