New species and records of Paraphloeostiba Steel, 1960 from China and Laos, and descriptions of four new species of related genera (Coleoptera: Staphylinidae: Omaliinae: Omaliini).

New taxonomic and faunistic data for eight species of Paraphloeostiba Steel, 1960 (Omaliini) from China and Laos are provided. Three new species are described and illustrated: P. ampliata sp.n. (China: Yunnan), P. brancuccii sp.n. (Laos), and P. cooteri sp.n. (China: Zhejiang). A new synonymy is established: P. formosana Shavrin Smetana, 2016 = P. amooraphila Shavrin, 2017 syn.n. Paraphloeostiba opacicollis Steel, 1960 is redescribed, illustrated, and recorded from Laos for the first time. A key to the species of Paraphloeostiba of China and Laos is presented. Previous records of P. apicalis (Cameron, 1925) from China are doubtful; additional material from Indonesia and the Philippines is reported. Paraphloeostiba sulcicollis (Fauvel, 1904) is recorded from China for the first time. New records of Paraphloeostiba are reported: P. apicalis from Mindanao (Philippines), P. formosana Shavrin Smetana, 2016 from mainland China and Vietnam, P. gayndahensis (MacLeay, 1873) from Yunnan, and P. sonani (Bernhauer, 1943) from Myanmar. In addition, four new species of Omaliini are described and illustrated: Nipponophloeostiba longilobata sp.n., Omalium khmericum sp.n., and Phloeostiba assingi sp.n. from northern Laos, and Phloeonomus (Phloeonomus) rougemonti sp.n. from China (Yunnan).