12. Odontomachus saevissimus ^HNS. Pl. V. figs. 10,11. B.M.

Worker. Length 7 lines.-Ferruginous: the mandibles of a deeper tint than the head, the mouth blackish; the deep excavations on the face as in the 0. infandus ^HNS, but the head behind smooth and shining; the central longitudinal channel very deeply impressed; the mandibles serrated and toothed at the apex. Thorax elongate, transversely striated, the prothorax very delicately so; the abdominal peduncle terminating in a long bent acute spine, and having a short blunt tooth at its base beneath; the legs pale ferruginous, with the tarsi dusky. Abdomen fusco-ferruginous, very smooth and shining.

Hab. Ceram. (Coll. Madame Ida Pfeiffer.)