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We recorded the following parasitic macronyssid mite species (Mesostigmata: Gamasina: Macronyssidae) from Northern Caucasus: Macronyssus leislerianus associated with the Leisler's bat Nyctalus leisleri (this mite species was known previously from a single record from Germany); Macronyssus diversipilis from Myotis tschuliensis (the southernmost locality for this mite species and a new host record); Steatonyssus noctulus from the common noctule Nyctalus noctula; and Cryptonyssus flexus from the Nathusius' pipistrelle Pipistrellus nathusii (new host record). We give diagnostic illustrations, measurements of the above mites and key to females of the genus Macronyssus of Russia and adjacent countries. [ABSTRACT FROM AUTHOR]