Abstract
Hydrachna virella (Acari: Hydrachnellae), a new species of water mite that parasitizes backswimmers of the species Buenoa scimitra Bare (Hemiptera: Notonectidae), is described. Adults and nymphs are characterized by a pronounced elongation of the posteromedial portion of the 4th coxae. Larvae are distinguished by the relative sizes of the coxal plates and by the positions and relative sizes of the coxal plate setae.
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