The clavigerite genus Triartiger Kubota (Staphylinidae: Pselaphinae) is here reported to occur on the mainland of China, and a new representative, Triartiger spatulatus Yin, new species, is described and illustrated. A single male was collected from a small colony of Tetramorium nipponense Wheeler ants (Hymenoptera: Formicidae) nesting in a dead tree branch. This species differs from known congeners in having relatively short antennae, distinct spatulate setae covering the cuticle, and well-developed trichomes on the elytra and abdomen. A map showing the distribution of Triartiger species is provided.