484 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
dently establishing colonies. At least eight of the species, viz. those 
belonging to the genera Euponera, Ponera, Solenopsis, Rhopalothrix, 
Strumigenys, Rhizomyrma and the two new genera Blepharidatta and 
Glamyromyrmex are hypogaeic (subterranean) ants, with small-eyed 
workers. With the exception of Pachycondyla harpax and Camponotus 
abdominalis all of the species are small or very small. I subjoin de- 
scriptions of the two peculiar species representing new genera. 
BLEPHARIDATTA, gen. nov. u 
Worker. Small, monomorphic. Mandibles triangular, their apical 
margins with a few subequal teeth. Clypeus vertical, bicarinate. 
Frontal area large, frontal groove absent. Eyes moderately large and 
very convex. Ocelli lacking. Antennae 11-jointed, funiculus with a 
well-defined 2-jointed clava. Head rather large, with a deep scrobe 
on each side, extending its full length and bordered above by the © 
frontal carinae which are large, expanded and horizontal, lobulate in 
front and extending to the posterior corners of the head. The inferior 
or lateral border of each scrobe is formed by a ridge as long as the 
frontal carina and running just above the eye. Thorax moder- 
ately long and slender, without promesonotal and mesoépinotal 
sutures; humeri and inferior angles of pronotum dentiform; epino- 
tum armed with a pair of long spines; metasternal angles large, 
compressed and sharply angular above. Petiole long and slender, 
pedunculate, with a low, rounded node. Postpetiole small, subglobu- 
lar. Gaster small, spherical, first segment very large, without ridges, 
grooves or tubercles; remaining segments very small. Sting vestigial. 
Legs rather slender; middle and hind tibiae without spurs; claws 
simple. 
Head, thorax, pedicel, and appendages opaque, sculptured; gaster 
smooth. Upper surface of body beset with long, paired, very sparse, 
stiff, and blunt hairs. 
BLEPHARIDATTA BRASILIENSIS, sp. nov. (Fig. 1). 
Worker. Length nearly 2 mm. 
Head nearly § longer than broad, narrower in front than behind, 
with strongly and broadly excised and marginate posterior border 
and nearly straight lateral borders, its dorsal and gular surfaces feebly 
