4. Ponera iridescens ^HNS.

P. rufo-fusca, laevis, nitida, chalybeo-iridescens; antennis pedibusque ferrugineis.

Worker. Length 2 1/2 lines. Dark rufo-fuscous, with changeable tints of blue on the head and thorax, in different lights; the apex of the metathorax, the legs, antennae, and apical margins of the segments of the abdomen, ferruginous; the head with an abbreviated impressed line above the insertion of the antennae; the mandibles with their inner margin serrated and three teeth at their apex; the scale of the abdomen compressed, elevated, and rounded above. Abdomen oblong; the apical margin of the first segment slightly constricted.

Hab. Borneo (Sarawak).