An illustrated key to the cuckoo wasps (Hymenoptera, Chrysididae) of the Nordic and Baltic countries, with description of a new species Author Paukkunen, Juho Author Berg, Alexander Author Soon, Villu Author Odegaard, Frode Author Rosa, Paolo text ZooKeys 2015 548 1 116 http://dx.doi.org/10.3897/zookeys.548.6164 journal article http://dx.doi.org/10.3897/zookeys.548.6164 1313-2970-548-1 D5D7B51E5AC6460D9B3C7584E46F9B3F D5D7B51E5AC6460D9B3C7584E46F9B3F Taxon classification Animalia Hymenoptera Chrysididae Hedychrum niemelai Linsenmaier, 1959 Figs 53, 58, 60, 63, 65 Hedychrum aureicolle ssp. niemelaei Linsenmaier, 1959: 38. Hedychrum niemelai : Morgan 1984 : 8. Diagnosis. Length 5-8 mm. The colouration is similar to Hedychrum nobile , but the pronotum and mesoscutum of the female are usually bright red (Fig. 53) and rarely yellowish. The mesotibial depression of the male is deeper than in Hedychrum nobile and oval or longitudinal in shape (Fig. 58). The tubercle on the posterior margin of S3 of the female is apically divided and smaller (Fig. 60) than in Hedychrum nobile . Additionally, the punctation of T3 is denser, especially in the male (Fig. 63). Distribution. Denmark, Estonia, Finland, Latvia, Lithuania, Norway, Sweden. Common. - Trans-Palearctic: from Europe to China (Heilongjiang) ( Rosa et al. 2014 ). Biology. Habitat: sparsely vegetated sandy areas. Adults are often found on flowers of Apiaceae , Asteraceae and Onagraceae ( Rosa 2004 , our own obs.). Flight period: from early June to late August. Host: Cerceris quadrifasciata (Panzer) and Cerceris quinquefasciata (Rossi) ( Crabronidae ) ( Schmid-Egger et al. 1995 , Saure 1998 , our own obs.). Possibly also Cerceris arenaria (Linnaeus), Cerceris ruficornis (Fabricius) and Cerceris rybyensis (Linnaeus) ( Lomholdt 1975 , Morgan 1984 ).