6. Odontomachus hirsutiusculus ^HNS. B.M.

"Worker. Length 3 1/4 lines.-Black: thinly sprinkled with griseous hairs; the mandibles, antennae and legs pale ferruginous, the mandibles about half the length of the head, shining and finely denticulate on their inner edge; the head longer than broad, very finely and closely striated; the deep lateral channels on the face opposite the eyes smooth and shining, the head slightly narrowed posteriorly, the hinder margin emarginate; from the centre of the emargination an impressed line runs forwards and unites with the anterior channels: on each side the striation is oblique. Thorax: the prothorax with longitudinal striae, which are straight in the centre and curved at the sides; the striation on the meso- and metathorax transverse; the scale of the peduncle conical, and terminating in a single spine at the summit; the abdomen elongate-ovate, smooth and shining.

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

This species very closely resembles the 0. haematodes, but independent of its smaller size, the head is of a different form; still it may possibly be a small form of that species, if such exist in the colonies of the insects of this genus, a circumstance which does not appear to have been observed.