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25. Polyrhachis bicolor HNS . B.M.
Female. Length 3 1/2 lines.-Head, thorax and scale of the abdomen black; antennae, mandibles, palpi, legs and abdomen rufo-castaneous. Head covered with short cinereous pubescence; the frontal carinae, at the sides of which the antennae are inserted, much elevated; the eyes and ocelli reddish. Thorax ovate, and, as well as the scale of the peduncle, covered with short cinereous pubescence; the prothorax with a short acute spine on each side; there is also a similar spine on each side of the metathorax; the posterior tibiae and tarsi fuscous. Abdomen globose, thinly covered with fine cinereous pile; the scale of the peduncle incrassate, quadrate, and with an acute spine at each of the superior angles, the spines straight and divergent.