The characters cf this genus are thus given by St. Fargeau. " Antennae entirely free, head elongated, and the thorax without " spines; maxillary palpi long, of 6 joints; jaws linear; wings " unknown. " I have got four species of Ant which perhaps may be ranged under this genus, of which only one species is described, and that from South America, but it is more than probable that they will form a new genus to which however I will not attempt to impose a name. My species have a long slender body, oblong head, large eyes, short antennae, inserted very near the mouth, linear or oblong jaws, and sting very severely.
Formica , pt., Fabr. Ent. Syst. ii. 364 (1793).
Myrmecia , pt., Fabr. Syst. Piez. 423 (1804).
Eciton , Latr. Hist. Nat. Crust, et Ins. iv. 130 (1804).
Ancylognathus , Lund, Ann. Sc. Nat. xxii. (1831).
Camptognatha , Westw. Griff. An. Kingd. xv. 5. 16 (1832).
The maxillary palpi 2-jointed, the labial palpi 3-jointed. The societies comprise males, females and workers, the latter consisting of two kinds of individuals, the larger kind in some species having the mandibles elongate, curved, somewhat sickleshaped, but not flattened, the head very large; the large and small workers with very minute eyes, in some species obsolete. Thorax unarmed. Abdomen small and ovate, the petiole with two nodes; the workers armed with a sting.-Males and females not known. Pl. VI.
