2. Odontomachus rugosus ^HNS.

O. rufescenti-fuscus; capite supra longitudinaliter striato, lateribus laevibus nitidis, thorace pedunculoque rude rugosis.

Worker. Length 3 lines. Head of a red-brown, the mandibles and scape rather paler, the flagellum pale testaceous; the mandibles much narrowed at their base, their inner edge finely serrated, terminating in two long blunt teeth which are abruptly curved at right angles with the jaws; the head a little longer than broad, deeply emarginate behind, longitudinally striated above, the sides smooth and shining. Thorax darker than the head, and coarsely rugose; the legs ferruginous. The node of the abdomen conical and rugose; abdomen smooth and shining and of a dark rufo-piceous colour, the apex pale.

Hab. Singapore.

This is a very remarkable and distinct species, both in sculpture and form. ',