Acknowledgements. I am very grateful to Mikhail Danilevsky (A.N. Severtzov Institute of Ecology and Evolution of Russian Academy of Sciences, Moscow), Aleksey Gusakov and Andrey Ozerov (Zoological Museum of Moscow University), Jiří Hájek (National Museum Prague, Czech Republic), Evžen Hajdaj (Ježov, Czech republic), Petr Kabátek (Prague, Czech Republic), Ladislav Klapka (Česká Lípa, Czech Republic), Andrey Lobanov (Zoological Institute of Russian Academy of Sciences, Saint Petersburg), Zdeněk Chalupa (Kladno, Czech Republic), Karel Hodek (Brno, Czech Republic), Vitaliy Kadnikov (Moscow), Sergey Murzin (Moscow), Igor Pljushtch (I.I. Schmalhausen Institute of Zoology of National Academy of Sciences of Ukraine, Kiev), Vladimir Skoupý (Kamenné Žehrovice, Czech Republic), Maxim Smirnov (Ivanovo, Moscow Region), Pavel Stěpánek (Kladno, Czech Republic) for providing me with the specimens for study.
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