12. Oecodoma nigra. B.M. Female. Length 6 lines. - Black: the mandibles ferruginous, longitudinally striated, and having two blunt teeth at their apex, their base, outer margins and apex black; two longitudinal carinae on the front, which run irregularly and obliquely to the lateral posterior angles of the head, each carina is elevated into a spine or tooth opposite the eyes; the head is longitudinally strigose, and has a number of short spines at the posterior angles.- Thorax: a short curved spine on each side in front, and two rather longer curved ones on the metathorax; the meso- ' thorax and scutellum longitudinally covered with a series of irregular carinae; the legs covered with short brown pubescence, the tarsi obscurely ferruginous. Abdomen globose, covered with irregular points and tubercles; the first node of the peduncle quadrate, and having a number of short points or tubercles; the second node transverse, and similarly tuberculate. Hab. Brazil; Rio (Tejuca). (Coll. Rev. Hamlet Clark.)

Published as part of Smith, F., 1858, Catalogue of the hymenopterous insects in the collection of the British Museum. Part VI. Formicidae., London :British Museum on page 186