Three species of parasitic mites of the family Laelapidae were found to be present in significant numbers on the meadow vole, Microtus pennsylvanicus. Two hundred and two individuals were identified from 15 host animals. Hyperlaelaps microti (Ewing), the most abundant parasite, made up 97 % of the individuals found. Androlaelaps fahrenholzi (Berlese) and Hirstionyssus isabellinus (Oudemans) constituted the remaining 3 % of the individuals found
