22. Polyrhachis mutatus ^HNS. Pl. IV. figs. 12, 13. B.M.

Worker. Length 3 1/2 lines.-Opake-black: abdomen ferruginous; the thorax armed with two long, stout, acute spines in front; the metathorax with two long straight spines directed backwards; the sides of the metathorax flattened, above, slightly concave or channeled; the peduncle armed with two long curved spines; the insect entirely destitute of hair; the legs without spines and dark rufo-piceous.

Hab. Burmah.