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).