Larval mites of several Arrenurus spp. are found as parasites on Zygoptera. Data from Poland on prevalence, loads, and host specificity are presented. The larval mites are identified and their site selection and host preferences recorded. 7 Zygoptera spp. and 7 spp. of arrenurid mite have been studied. Particular attention has been paid to Coenagrion puella and its parasites. New host records are included.