| abstract | The diagnosis of the genus Tetroppia Gordeeva, 1999 has been added: rostrum without teeth or with teeth and incisions, the femora IV is maceform or with appendices on the wided proximal parts. The definitions of three subgenera of this genus have been given: T. (Tetroppia) stat. rev. (the type-species Oppia clavigera Hammer, 1952) (the rostrum teeth are absent, the femora IV are maceform), T. (Dentoppia) subgen. n. (the type-species T. (Dentoppia) metulifera Gord. et Bajartogtokh, sp. n.) (the rostrum teeth present, the femora IV are maceform) and T. (Drukoppia) subgen. n. (the type-species T. (Drukoppia) montana Gord. et Bajartogtokh, sp. n.) (the rostrum teeth are absent, the femora IV with appendices on the wided proximal parts). Four new species T. (Dentoppia) metulifera sp. n., T. (Dentoppia) dentifera Gord. et Bajartogtokh, sp. n., T. (Drukoppia) montana, sp. n. and T. (Drukoppia) nana Gord. et Bajartogtokh, sp. n. from Mongolia are described and figured. |