The Palaearctic types of Chrysididae (Insecta, Hymenoptera) deposited in the Linsenmaier collection. Part 2. Elampini: genus Hedychridium Abeille de Perrin, 1878 Author Rosa, Paolo 0000-0003-2919-5297 Natur-Museum Luzern, Kasernenplatz 6, CH- 6003 Luzern, Switzerland. & Université de Mons, Laboratoire de Zoologie, Place du Parc 20, 7000 Mons, Belgium. paolo.rosa@umons.ac.be Author Heim, René 0000-0002-6011-5200 Natur-Museum Luzern, Kasernenplatz 6, CH- 6003 Luzern, Switzerland. & St. - Karli-Strasse 32 c, CH- 6004 Luzern, Switzerland. rene.heim@bluewin.ch Author Bernasconi, Marco Valerio 0000-0003-0993-8049 Natur-Museum Luzern, Kasernenplatz 6, CH- 6003 Luzern, Switzerland. Bernasconi@lu.ch text Zootaxa 2022 2022-01-11 5090 1 1 94 journal article 10.11646/zootaxa.5090.1.1 1175-5326 5836207 FD5683E4-4FB8-4A9C-99FE-22344A7EC4F9 Genus Hedychridium Abeille de Perrin, 1878 Hedychridium Abeille de Perrin, 1878: 3 . Type species: Hedychrum minutum Lepeletier, 1806 (= Chrysis ardens Coquebert, 1801 ), by subsequent designation of Ashmead 1902 . Hedychridium Abeille de Perrin, 1878 is the second largest genus within the family Chrysididae , after Chrysis Linnaeus, 1761 , and the largest among the tribe Elampini , including more than 300 valid species. It is a heterogeneous genus of small to medium-sized cuckoo wasps (2.0–7.0 mm), distributed particularly in dry to arid areas of the Holarctic region. Semenov-Tian-Shanskij (1954) and Semenov-Tian-Shanskij & Nikol’skaya (1954) subdivided the genus Hedychridium into twelve genera, namely (besides Hedychridium s.str. ): Actineuchrum Semenov-Tian-Shanskij,1954; Claudiola Semenov-Tian-Shanskij,1954; Colpopyga Semenov-Tian-Shanskij,1954; Cyrteuchridium Semenov-Tian-Shanskij, 1954; Cyrteuchrum Semenov-Tian-Shanskij, 1954; Euchridium Semenov-Tian-Shanskij, 1954; Euchrum Semenov-Tian-Shanskij, 1954; Homaleuchrum Semenov-Tian-Shanskij, 1954; Irenula Semenov-Tian-Shanskij & Nikol’skaya, 1954; Zarudnidium Semenov-Tian-Shanskij, 1954; Zarudnium Semenov-Tian-Shanskij, 1954. Currently, only Colpopyga Semenov-Tian-Shanskij, 1954 is considered as a valid genus (Rosa 2017), as recently confirmed by means of molecular analyses ( Pauli et al . 2019 ). All other Semenov-Tian-Shanskij’s genera were synonymised with Hedychridium and treated as species groups by Linsenmaier (1968) . The subgenus Prochridium Linsenmaier, 1968 was upgraded to genus rank by Kimsey & Bohart (1991) , but we here follow Linsenmaier’s (1994 , 1999 ) classification and consider it with subgeneric status only for practical reasons, as already did in Rosa et al. (2015) .