Polyrhachis mucronatus

Smith, F., 1859, Catalogue of hymenopterous insects collected by Mr. A. R. Wallace at the Islands of Aru and Key., Journal of the Proceedings of the Linnean Society of London, Zoology 3, pp. 132-158 : 140

8. Polyrhachis mucronatus .

P. laevis, nitidus, niger; thorace spinis duabus crassis compressis acutis postice armato.

Worker. Length 2 1 / 3 lines. Black, smooth, and shining, very delicately and indistinctly aciculate; the antennae beneath and the tibiae and femora obscurely ferruginous, the anterior and intermediate tibiae brightest; the apex of the mandibles ferruginous. Thorax transverse in front, or very slightly curved, with the lateral angles acute; the thorax is rounded above, and not margined at the sides; the metathorax armed with two long, stout, acute compressed spines; the spines divergent, as well as two on the scale of the petiole, which are long and very acute. Abdomen globose. Hab. Aru.