15. Odontomachus bispinosus. B.M.

Worker. Length 3 lines. - Black: the mandibles, antenna; and legs ferruginous. The head deeply emarginate behind, lon- gitudinally and finely striated, with the sides behind the eyes smooth and shining. The thorax rugose, with two minute spines on the metathorax. Abdomen smooth and shining, with the apex pale testaceous; the node of the peduncle armed above with two stout acute spines, directed outwards.

Hab. Brazil (Ega).

This very distinct species we have just received from Mr. Bates; at its side on the same piece of card is a specimen of a species of Cylistes, a genus of Histeridae; this seems to indicate some connexion between them; probably the Beetle was found in the nest of the Ant, but we have no information on the sub- ject.