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20. Polyrhachis abdominalis HNS . B.M.
Worker. Length 3 1/2 lines.-Head, thorax and legs black; abdomen ferruginous. Head and thorax opake, very delicately shagreened, the sides of the thorax and the legs with a slight rusty-red appearance; the anterior margin of the clypeus rounded; the eyes pale reddish-brown. Thorax armed in front with two long straight spines, directed obliquely forwards; the pro- and metathorax slightly convex, not margined laterally above; the metathorax with the lateral margins raised, longitudinally concave above, and terminating on each side in a long, straight, slightly divergent spine, the spines obscurely ferruginous at the apex. Abdomen subglobose, the scale of the peduncle incrassate, and with two long acute curved spines above.