[ O. similis (Scriba, 1790)]

Comments: The species is known in Sweden, Denmark (Silfverberg 2010), Lithuania (Kabakov 2006; Tamutis et al. 2011), Belarus (Alexandovitch & Pisanenko 1991; Kabakov 2006) and north-western Poland (Byk 2012). The data from Kaliningrad Region are absent, but the old data on distribution of O. fracticornis (Preys.) could include this species too. In any case, the occurrence of the species in the Kaliningrad Region is possible.