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 Hedychrum gerstaeckeri Chevrier, 1869 Hedychrum gerstaeckeri Chevrier, 1869: 47. Syntypes ♀♀, ♂♂, [not holotype]; Switzerland (Geneva) (examined). Material examined. Mongolia: Khentii , 3 ♀♀, 100 km NE of Ondorkhaan, Kerulen River, 970 m, 22.VII.2007, leg. MH (MHC); Selenge , 1 ♀, 5 ♂♂, 90 km N of Ulaanbaatar, Segnez River, 1450 m, 6-8.VII.2003, leg. JH (MHC); Tuv , 4 ♀♀, 50 km N of Ulaanbaatar, E of Mandal, 1180 m, 8-13.VIII.2007, leg. MH (MHC). Distribution. *Mongolia (Khentii, Selenge, Tuv); Palaearctic and Oriental region, from western Europe to Russian Far East, Japan, China and Taiwan ( Rosa et al. 2014 , 2019 ).