The description of the male of the species Quwatanabius chiaw (Smetana, 1995) is provided for the first time, including a habitus photo and illustrations of the aedeagus. A brief discussion of the endemic status of Q. chiaw on the island of Taiwan, as well as additional Taiwanese material of the wide-spread Q. flavicornis (Sharp, 1889) are also provided.
Keywords: Coleoptera, Male description, Staphylininae, Cyrtoquediini, Oriental Region, distribution, bionomics.