1940] 
Rare Ponerine Genera 
77 
maximum breadth of head is slightly posterior to middle; 
eyeless; in side view the antennal insertions are above the 
mandibles ; antennal scapes curved, separated at their bases 
by a low lamina 0.27 mm. long, joints 2-10 of the funiculus 
strongly transverse, terminal joint conic, nearly as long 
as the preceding four joints taken together; mandibles very 
small, strongly curved, apical tooth much the longest and 
acute with a series of about six irregular, acute denticles 
on the cutting surface. Thorax in profile with pronotum 
convex anteriorly, with the entire dorsum of thorax plane 
and without trace of sutures, posterior epinotal border form- 
ing a distinct angle with the dorsum and on the declivity 
produced as a distinct but rounded obtuse angle. Thorax 
from above broadest at pronotum, with a short collar, pro- 
notum rounded anteriorly and sides feebly impressed in 
meso-epinotal region. Petiole with a short anterior pe- 
duncle, high node and much longer and sub-cylindrical 
posterior peduncle, from above rectangular, 1% times longer 
than broad ; the node convex anteriorly and feebly excavated 
behind ; ventral lamina in side view well-developed, the 
anterior margin convex, the ventral margin plane and form- 
ing with the oblique posterior margin a slight hook. An- 
terior margin of first gastric segment impressed at petiolar 
junction, feebly convex dorsally, more sharply impressed 
but shorter ventrally; second gastric segment much longer 
than the first ; remaining segments largely retracted ; sting 
long and exserted. Legs moderately long and slender. 
Sub-lucid, finely, evenly and shallowly punctate, the punc- 
tations partly large, partly small. 
Pubescence a very fine, whitish appressed pubescence. 
Color an even ferruginous of moderate density. 
Holotype: One worker taken by myself June 29, 1938 on 
Barro Colorado Island, Panama Canal Zone. The ant was 
among leaves and humus on the forest floor. 
This species, first to be found in Central America, is 
easily distinguished from the single other New World spe- 
cies, P. boliviensis Mann of Bolivia, by the convex anterior 
margin of the head which is also broader, the greater number 
of teeth on the mandibles, the much more abruptly rising 
node of the petiole and its less excavated posterior surface, 
as well as the distinct peduncle behind. Though boliviensis 
