1977] 
Brown — New Genus of Myrmicine Ant 
219 
penultimate; funicular (ring) segments II-V small, subequal in 
length, broader than long; funicular segment I (pedicel) about 
equal in length to the next 2 to 3 (ring) segments. 
Clypeus broad, shield-shaped, narrowed sharply laterad on each 
side, its surface gently convex; anterior margin broadly arcuate, 
with a complex median notch. 
Mandibles triangular, convex, with opposable, serially-toothed 
mesial margins (teeth coarse, sharp, 7 in number on each mandi- 
ble); these margins arcuate in side view and finally directed ventrad 
at apex. In the vee between each of the larger teeth is a minute 
piligerous denticle. Labrum thick, linguiform and narrowly rounded 
at apex, but appearing truncate in side view; its dorsal surface bear- 
ing a narrow pencil of fine white setae that arches forward to ex- 
tend beyond the mandibular apices, probably serving as a “range- 
finder” trigger hair. Palpi not visible and undoubtedly short, but 
segmentation not determined. 
Trunk compact, its dorsal outline forming one continuous arc 
from base of pronotal cervix to petiolar insertion, dominated by 
pronotum. which makes up about half its length and is wider than 
the rest (a little more than half as wide as head). Promesonotal 
suture marked by a faint curved transverse line paralleled by a 
costa on the dorsum, but completely fused here, though complete 
on the pleura. Pronotum with blunt, barely suggested humeral 
angles as seen from above, but not distinctly marginate in front 
or on the sides; upper sides bulging and overhanging lower sides; 
ventral margins each forming a curved, cultrate, projecting flange 
or lamella. Metanotal groove obsolete, its position perhaps marked 
by a transverse carina at the top of what appears to be the pro- 
podeal declivity, but the true declivity probably is confined to the 
lower part of this slope, beneath a lower and weaker transverse 
carina or costula. 
Mesopleura narrow and impressed, but their lower central parts 
(mesepisterna) are occupied on each side by a peculiar organ con- 
sisting of a large subcircular pit filled with a silvery-white, convex 
pad of fine, radially-arranged hairs. The anterior edge of this struc- 
ture forms the posterior side of the ventral invagination between 
pro- and mesonotum, but a broad piece of mesokatepisternal cuticle 
separates the organ from the mesocoxa. This organ appears to be 
the external part of an exocrine gland or glands, though the gland 
openings, if any, are hidden by the pad of fine hairs. 
