Review of subfamily Prodiamesinae (Diptera: Chironomidae) from the Russian Far East and bordering territory Author Makarchenko, Eugenyi A. 0000-0003-2765-8729 Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, 100 let Vladivostoku 159, 690022 Vladivostok, Russia & makarchenko @ biosoil. ru; http: // orcid. org / 0000 - 0003 - 2765 - 8729 makarchenko@biosoil.ru Author Semenchenko, Alexander A. 0000-0001-7207-9529 Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, 100 let Vladivostoku 159, 690022 Vladivostok, Russia & semenchenko _ alexander @ mail. ru; https: // orcid. org / 0000 - 0001 - 7207 - 9529 semenchenko_alexander@mail.ru text Zootaxa 2023 2023-07-31 5323 1 1 26 http://dx.doi.org/10.11646/zootaxa.5323.1.1 journal article 10.11646/zootaxa.5323.1.1 1175-5326 AABE0C7B-9A90-4CF9-9707-936FF912853D Propsilocerus akamusi (Tokunaga) Spaniotoma ( Orthocladius ) akamusi Tokunaga, 1938: 317 . Orthocladius akamusi Tokunaga 1950: 1563 . Chaetocladius sexpapilosus Yan & Ye, 1977: 194 . Tokunagayusurika akamusi Sasa 1978: 94 . Propsilocerus akamusi Saether & Wang in Guo 1995: 580 ; Saether & Wang 1996: 459 ; Petrova et al. 2003: 41 ; Kiknadze et al. 2007: 34 (karyotype); Ashe & O’Connor 2012: 501 . Material examined. Russia : 2 larvae , Russia , Trans-Baikal Territory , Uletovsky District , Arey Lake , 230 km southwest of the Chita City , area of the recreation center Crystal 50.99802 N , 111.25694 E , 20.12.2019 , leg. P. Matafonov ; 4 larvae , Russia , Trans-Baikal Territory , Chita City , Kenon Lake , 52.030147 N , 113.380136 E , 11.03.2021 , leg. P. Matafonov. Comments. Unfortunately, in our material there are no adult males of this species, only larvae. Therefore, we do not give a redescription of the male from the Russian Far East, but present barcoding data below. Distribution. Japan , China , South Korea , East Siberia (Baikal Lake basin, Trans-Baikal Territory), Russian Far East (Amur River basin).