An addendum to the recent checklist of the Chrysididae from Mongolia is given. Examination of old museum material and recently collected specimens has led to the discovery of eight new records for the country and eleven new species for science. Eight species are newly recorded from Mongolia: Chrysisinclinata Linsenmaier, 1959, C.martinella du Buysson, 1900, C.speciosa Radoszkowski, 1877, Euchroeuspurpuratus (Fabricius, 1787), Holopygalucida (Lepeletier, 1806), H.similis Mocsáry, 1889, Hedychridiumfemoratum (Dahlbom, 1854) and H.leleji Rosa, 2017. Two species, Hedychridiumcupreum (Dahlbom, 1845) and H.propodeale Rosa, 2017 are excluded from the checklist of Mongolian Chrysididae: the former is described here as H.erythrosoma sp. nov., the latter is identified as H.leleji Rosa, 2017. The hitherto unknown male of Chrysismocsaryi Radoszkowski, 1889 is described and illustrated. Eleven new species are described: Chrysisstrakai sp. nov., C.woodi sp. nov., Hedychridiumerythrosoma sp. nov., H.frontale sp. nov., H.jacobsi sp. nov., H.splendens sp. nov., H.striatum sp. nov., H.varvarae sp. nov., H.weii sp. nov., Holopygatyrneri sp. nov., and Philoctetesboreki sp. nov. Keys to males and females of all known Mongolian species of Hedychridium Abeille de Perrin, 1878 are provided. The Mongolian cuckoo wasp fauna now comprises 107 species in 18 genera and two subfamilies.
Keywords: Central Asia; Palaearctic Region; Taxonomy; key; new records.
Paolo Rosa, Maxim Yu. Proshchalykin, Marek Halada.