Hedychrum gerstaeckeri Chevrier, 1869

Paukkunen, Juho, Rosa, Paolo, Soon, Villu, Johansson, Niklas & Ødegaard, Frode, 2014, Faunistic review of the cuckoo wasps of Fennoscandia, Denmark and the Baltic countries (Hymenoptera: Chrysididae), Zootaxa 3864 (1), pp. 1-67 : 18-19

19. Hedychrum gerstaeckeri Chevrier, 1869

Hedychrum Gerstaeckeri Chevrier 1869: 47 . Syntypes ♂♂, ♀♀; Switzerland: Beau-lac, Nyon , Vaud (MHNG) (examined).

Hedychrum gerstaeckeri: Niemelä 1950: 132 , Valkeila 1962: 64, Wengris 1962: 9, Valkeila et al. 1963: 40, Tumšs & Maršakovs 1970: 91, Erlandsson 1971: 88, Vikberg 1986b: 67, Söderman & Vikberg 2003: 44, Soon 2004: 18, 45, Salminen 2007: 143, Valtonen 2007: 20, Allearter.dk 2010 (as H. gerstäckeri ), Orlovskytė et al. 2010: 146, Raekunnas 2010: 10, Ranta 2012: 32.

Hedychrum gerstaeckeri gerstaeckeri: Rosa & Soon 2012

Material examined. *Russian Fennoscandia (total 13 exx.): Ik: Metsäpirtti [= Zaporozhskoe]; Sakkola [= Gromovo]; Uusikirkko [= Polyany]; Valkjärvi [= Michurinskoe]; Kl: Kurkijoki; Kol: Petrozavodsk.

Distribution. Denmark, Estonia, Finland, Latvia, Lithuania, *Russian Fennoscandia.—Transpalearctic: from West Europe to Japan and Taiwan ( Linsenmaier 1997).

Remarks. The species is found in all the Nordic and Baltic countries except Norway and Sweden. It is not as common as Hedychrum niemelai and H. nobile are in Finland, while in Estonia it is the most abundant species of Hedychrum . Soon (2004) reported the species from Denmark on the basis of a Danish female specimen in ZMUC (exact collection locality unknown). Also a male specimen is known from Denmark (EJ: Thorsager, 1918) (K. Runge Poulsen in litt.).