1965 ] Brown — Typhlomyrmecini 67 
segments, with the last 3 or 4 enlarged and forming a more or less 
distinct club. 
Mandibles triangular in basic plan, their dorsal surfaces convex in 
both directions; basal border distinct from masticatory border, al- 
though they may meet either in an angle or a broad curve. Masticatory 
border with minute crenulation, denticulation and/or small, uneven 
teeth; apical tooth large to very large, and tending to cross with its 
opposite number when the mandibles are fully closed. Shape and 
dentition varying with the species. 
Under-mouthparts relatively bulky; labrum bilobed, with a broad 
median excision. Palpi segmented maxillary 1, labial 2. 
Alitrunk robust, with rounded humeri and propodeum, slightly 
constricted at posterior mesonotum ; promesonotal suture distinct and 
apparently movable; metanotal groove distinct, only feebly impressed. 
A distinct line curving posteroventrad from the propodeal spiracle 
represents the upper edge of the metapleural gland atrium showing 
through the integument. Legs short and thick; tarsal claws small, 
those on the anterior legs toothed, the others simple; tibial calcariae 
of middle and hind legs 1 or 2, indistinctly pectinate or simple. 
Petiole briefly pedunculate; node distinct, variable in form (Figs. 
1, 3) ; subpetiolar process well-developed, acute or rounded at apex. 
Gaster porrect or slightly downcurved, of the usual ponerine type, 
with slight but distinct constriction after postpetiole; sternum fused 
to tergum in abdominal segment III (postpetiole) and IV, but not 
fused in V ( T. rogenhoferi worker, female) . Sting well-developed 
and acute, usually exserted in dried specimens. 
Sculpture generally fine, varying in development with the species 
and, within species, allometrically. Cranium longitudinally striate or 
striolate above, especially mesad, mostly shading off to reticulate on 
the sides. Mandibles and central part of clypeus usually smooth and 
shining. Alitrunk, petiole and gaster smooth, with spaced punctation, 
or partly reticulo-striate or otherwise roughened, the sculpture always 
becoming weaker caudad. Pilosity fine, rather short, uneven, fairly 
abundant and widely distributed. A pair of long fine sensory hairs 
rises steeply from the clypeus. 
Alate female, or gyne: Slightly (T. pusillus) to considerably 
(T. rogenhoferi) larger than associated workers, and often darker in 
color, at least around the ocelli ; darkest in T. rogenhoferi , which is 
brown. Sculpture sometimes better developed than in workers, and 
petiolar node distinctly shorter and more transverse. Compound eyes 
large and hairy; ocelli developed. 
Alitrunk somewhat box-like, with a rather flat dorsal surface; 
