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 

 GlamjTomyrmex are hypogaeic (subterranean) ants, with small-eyed 

 workers. With the exception of Pachycondyla harpax and Caviponotus 

 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. 



Worker. Small, monomorphic. Mandibles triangular, their apical 

 margins with a few subequal teeth. Cl^^eus 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 mesoepinotal 

 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 



