20. Polyrhachis numeria, P. niger; thorace supra deplanato, spinis duabus anterioribus; abdominis squamula spinis duabus erectis acutis, utraque ad basin minute unispinulosa. Worker. Length 3 lines. Black, and covered with silky cinereous pile; the thorax flattened above, and slightly curved longitudinally to the verge of the truncation of the metathorax, the spines on the prothorax stout, short and acute; the margins of the thorax slightly raised. Abdomen globose, truncate at the base: the node of the peduncle broad, transverse above with an erect spine at each lateral angle, and, a shorter acute spine outside at their base. (Pl. I, fig. 19.) Hab. Celebes (Tondano).

Published as part of Smith, F., 1861, Catalogue of hymenopterous insects collected by Mr. A. R. Wallace in the Islands of Ceram, Celebes, Ternate, and Gilolo., pp. 36-48 in Journal of the Proceedings of the Linnean Society of London, Zoology 6 on pages 42-43