Falagriini, Deremini, Athetini and Thamiaraeini from Borneo (Coleoptera, Staphylinidae)

Nine genera are new for Borneo, two of the Falagriini: Pheigetoxenus Kistner and Cordalia Jacobs; one of the Deremini: Demerinda Cameron; four of the Athetini: Emmelostiba Pace, Aloconota Thomson, Hydrosmecta Thomson and Berca Blackwelder; two of the Thamiaraeini: Gastropaga Bernhauer and Platorischna Pace. Sixty-six species are recognized, of which fifty-three are described as new. New synonymies are proposed for three species: Falagria densipennis Cameron, 1939 is a junior synonym of Falagria amabilis Cameron, 1933; Atheta bogorensis (Sawada, 1971) and Atheta mon Pace, 1992 are two junior synonyms of Atheta ocularis Cameron, 1929. New combinations are proposed for four species. All new species are illustrated and compared with similar looking species. Keys to almost all the species of the genera of the tribes mentioned above are presented.