Larvae of seven Hydracarina species from the genera Hydrachna and Eylais were the parasites of 12 host species of Cymatia bonsdorffi, C. coleoptrata, Corixa dentipes, C. sahlbergi, C. linnaei, Sigara concinna, S. praeusta, S. striata, S. falleni, S. distincta, Notonecta glauca, Nepa cinerea. The parasites were most abundant on Heteroptera species which were numerous in the lakes. Differentiation of parasite occurrence was analysed with respect to sex and stage of development of the hosts. A detailed description has been given as to the parasitism by Hydrachna cruenta upon S. striata and S. falleni.
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