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In this work new species parasitizing on Coleoptera (Cucujomyces rotundatus sp. n. on Silvanus unidentatus, Hydrophilomyces gracilis sp. n. and H. hamatus sp. n. on Cercyon spp.), Dermaptera (Hesperomyces forficulae sp. n.) and Acarina (Rickia polonica sp. n.) are described. The localities of four species new for Poland are given.