The genus Lyphia Mulsant & Rey, 1859 (Tenebrionidae: Triboliini Gistel, 1848) with the type species Lyphia ficicola Mulsant & Rey, 1859 (junior synonym of Bius tetraphylla Fairmaire, 1856) is widespread in the Palaearctic, Oriental and Papuan-Pacific Regions, as well as in Africa. The present study treats all species known from the Oriental Region including the Himalayas and China, Taiwan, and from all Sunda Islands including Lombok and Sulawesi. Additional available species from Papuan and Pacific Regions are also listed and figured for comparison. An identification key for the Oriental species is compiled. New species: Lyphia weigeli sp. nov. (Ternate Island, Moluccas). New synonyms: Lyphia indicola Gebien, 1922 (= Lyphia subopaca Blair, 1930 syn. nov.) and Lyphia instriata Pic, 1924 (= Lyphia elongata Pic, 1924 syn. nov., Lyphia longiceps Pic, 1924 syn. nov., Lyphia orientalis Blair, 1930 syn. nov.). Lectotypes are designated for Lyphia elongata Pic, 1924, Lyphia instriata Pic, 1924, Lyphia laeviceps Gebien, 1922, Lyphia longiceps Pic, 1924, Lyphia punctaticeps Pic, 1924, and Lyphia substriata Pic, 1924.