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P. niger; antennis mandibulis pedibusque ferrugineis, abdominis squamula spinis duabus longis armata.
Female. Length 4 lines. Black: the antennae and mandibles ferruginous. Thorax elongate-ovate; wings subhyaline and iridescent, the nervures testaceous; the legs ferruginous, the coxae black. Abdomen: the base more or less ferruginous; the scale with two stout divergent spines above, which curve slightly backwards.
Hab. Borneo (Sarawak).
Type specimens: Holotype of Polyrhachis ruficornis: casent0901847
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