Abstract
Four water mite species of the genera Atractides and Sperchon (Acari: Hydrachnidia) are reported from Serbia and Crna Gora, Bosnia and Herzegovina, Macedonia and Bulgaria. Sperchon vesnae is described as a new species; first description are given of the female of Atractides longisetus Pesic, 2002; first records from the Balkan peninsula are given of Sperchon longissimus Viets, 1920, and Atractides cf. lunipes Lundblad, 1956. The latter is a rare water mite species previously known only from the French Pyrenees.

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