First checklist of the chrysidid wasps (Hymenoptera, Chrysididae) of Mongolia, with description of new species Author Rosa, Paolo Via Belvedere 8 / d, I- 20881 Bernareggio (MB), Italy https://orcid.org/0000-0003-2919-5297 Author Proshchalykin, Maxim Yu. Federal Scientific Centre for East Asian Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, Vladivostok 690022, Russia https://orcid.org/0000-0001-7870-8226 proshchalikin@biosoil.ru Author Halada, Marek Milady Horakove 74 37012 Ceske Budejovice, Czeck Republic Author Aibek, Ulykpan National University of Mongolia, Ulaanbaatar 210646, Mongolia text ZooKeys 2020 999 49 107 http://dx.doi.org/10.3897/zookeys.999.58536 journal article http://dx.doi.org/10.3897/zookeys.999.58536 1313-2970-999-49 34E6CD7AEAD146D4926A61683DFFC740 917CDF077020599AB0CA822B3D80745A Omalus margianus (Semenov, 1932) Ellampus (Dictenulus) margianus Semenov-Tian-Shanskij, 1932: 15. Lectotype ♀ (designated by Kimsey 1986 : 107); Turkmenistan: Imam-baba (ZIN) (examined). Material examined. Mongolia: Arkhangai , 1 ♀, 90 km NE of Tsetserleg, 48°03'N , 102°25'E , 27.VII.2005, leg. JH (MHC); Bayankhongor , 1 ♀, 75 km S of Bayankhongor, 45°20'N , 100°48.5'E , 1330 m, 8.VII.2004, leg. JS (MHC); Bulgan , 2 ♂♂, 137 km NE of Aravaykheer, 47°20'N , 103°45.5'E , 1250 m, 2.VII.2004, leg. JH (MHC); 1 ♀, 1 ♂, 143 km NE of Aravaykheer, 47°24'N , 103°39'E , 1300 m, 26.VII.2004, leg. MH (MHC); 2 ♂♂, Mongol Els Nat. Res., dunes, 47°24'N , 103°39'E , 31.VII.2005, leg. JH (MHC); Sukhbaatar , 2 ♀♀, 100 km SSW of Baruun-Urt, 1100 m, 30.VII.2007, leg. MH (MHC); Tuv , 1 ♂, 80 km W of Ulaanbaatar, 1230 m, dunes, 17.VIII.2007, leg. MH (MHC). Distribution. *Mongolia (Arkhangai, Bayankhongor, Bulgan, Sukhbaatar, Tuv); Central Asia (Kimsey and Bohart 1991).