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Extant: 1 valid subspecies
P. niger, longitudinaliter striatus, thoracis marginibus expansis, metathorace squamulaque petioli spinis duabus crassis acutis curvatis.
Worker. Length 3 lines. Black; the head and thorax longitudinally striated, the abdomen very finely and evenly so; the prothorax transverse, wider than the head, the anterior and lateral margins recurved, the latter acute at their anterior angles, and rounded at the posterior ones; the lateral margins of the mesothorax recurved, a deep notch between the meso- and metathorax; the latter with a long, stout, curved, acute spine on each side. The scale of the petiole produced above on each side, into a long, curved, stout, acute spine, which curves backwards round the sides of the abdomen.
Elevations: collected at 305 m