1951] 
Gregg — Exotic Ants 
79 
petiole, and the first segment of the gaster, completely and 
heavily sculptured with coarse, deep pits or foveolae. The 
pits are rounded to hexagonal on most of the body, but are 
elongate and oval on the head and the gastric segment. The 
sculpture is so coarse that under the microscope the shining 
surfaces, especially of the ridges between the pits are not 
diminished, but to the unaided eye, the general body tone is 
subopaque. 
Long, delicate, sharp-pointed hairs cover all parts of the 
body and appendages, and arise separately from the foveo- 
lae where these are present. Pubescence is practically absent 
on the body, but is abundant on the scapes, funiculi, coxae, 
legs, and the posterior region of the gaster. 
Color reddish brown, with the funiculi, scapes and legs 
a lighter red ; tip of gaster yellowish. 
Holotype: winged female (M.C.Z. No. 28556). 
This species is described from a single female specimen 
(worker caste unknown), taken on November 12, 1921 at 
Wai Lima, Prov. of Lampong, southern Sumatra, by H. H. 
Karny. 
The ant belongs apparently to a rare group, and, accord- 
ing to Dr. Brown, there is only one other specimen in the 
Wheeler Collection very similar to it, a worker taken by 
Dr. Chapman in the Philippines. This worker was marked 
as new by Wheeler, but was left undescribed. The new spe- 
cies finds its place among other Stictoponera (namely, ru- 
gosa (F. Sm.), coxalis Rog., menadensis Mayr, bicolor Em., 
and avia Forel), a group which possesses a low, loaf-shaped 
or globular petiole. None of these, however, has the eyes so 
far back on the head as does posteropsis, a character which 
alone will distinguish it from the others. I have seen a 
specimen of Stictoponera bicolor, and two of S. costata Sm. 
(—Ponera rugosa F. Sm.?), and upon comparing them with 
posteropsis, have found that the latter differs from them 
in the following particulars. The eyes are not only placed 
far posteriorly on the head, but are very convex, whereas 
in bicolor they are much flatter. The antennal scapes reach 
or project but slightly beyond the occipital corners, though 
in bicolor they exceed the corners by a distance equal to the 
greatest width of the scape. No teeth are present on the 
