1. Ectatomma tuberculata ^HNS. Pl. VII. figs. 10-13. B.M.

Formica tuberculata, Latr. ^HNS Fourm. 210. viii. f. 46. A. [[worker]], 46. C. [[queen]].

Oliv. Encycl. Meth. vi. 498. 41.

Formica tridentata, Fabr. ^HNS Syst, Fiez. 412. 69.

Hab. South America; Brazil (Para; Santarem).

Male. Length 5 lines.-Fuscous or black, somewhat varying in colour: the antennae as long as the insect. Head small, narrowed behind and transversely striated behind the ocelli, in front of which the striation is finer and longitudinal; the face has three carinae between the antennae, the clypeus triangular and strongly striated, the antennae fulvous beneath; the mandibles and legs rufo-testaceous; the metathorax and node of the peduncle obscurely testaceous; the wings subhyaline, the nervures rufo-testaceous; the mesothorax and scutellum longitudinally striated, and having two oblique impressed lines which meet in the middle. Abdomen elongate; the apical margin of the first segment constricted, the two basal segments finely longitudinally aciculate, the third and following segments smooth and shining; the apex of the abdomen pale rufo-testaceous.

Hab . Brazil (Para; Santarem). (Coll. H. W. Bates.)

The sexes of this species were taken from the nest by Mr. Bates; the females and workers do not vary much in colouring, but the males differ considerably, some examples being entirely pale rufo-testaceous.