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Authors' addresses: Milan CHVÁLA Department of Zoology Charles University Vinicná 7, CZ-128 44 Praha 2 CZECH REPUBLIC e-mail: mchvala@natur.cuni.cz Mihály FÖLDVÁRI Department of Zoology Hungarian Natural History Museum H-1088 Budapest, Baross u. 13. HUNGARY e-mail: foldvari@zoo.zoo.nhmus.hu