A new species of Nemacerota Hampson, [1893], N. paizhenensis sp. n., is described from the Xizang Autonomous Region (= Tibet), China. The male adult and the genitalia of the new species are illustrated and compared with its most similar species: N. inouei László, Ronkay, Ronkay Witt, 2007 and N. pectinata (Houlbert, 1921); an identification key and distribution map for all Chinese Nemacerota species are provided.
Keywords: Lepidoptera, Chinese fauna, Himalayan-Sino-Pacific, morphology, Southeast Tibet, taxonomy.