P. niger, pubescens; thorace supra deplanata, spinis duabus anterioribus; petioli squamula quadrispinosa.
Worker. Length 4 lines. Black with a thin silky cinereous pile, and sprinkled over with erect pale pubescence, which covers the antennae and legs also; the extreme tip of the antenna; pale rufo-testaceous, the palpi of the same colour; the head and thorax longitudinally striated; the prothorax with two stout acute spines; the margins of the thorax slightly elevated and extremely acute at the angles of the truncation of the metathorax, sub-dentate; the node of the peduncle with four acute spines. Abdomen globose, with the base truncate. (PL I. fig. 21.)
Hab. Celebes (Tondano).
