| Summary: | Under conditions of the Middle Dnieper area in open natural stations during winter with frosts reaching —26°, but with a sufficient snow cover, some species of Gamasoidea can porpagate in inhabited nests of Microtus arvalis Pall, and Arvicola terrestris L. under a surface layer of soil. The finding of all the mobile phases of development and a great number of females with eggs of Haemolaelaps glasgowi Ewing in the nests of the mentioned rodents in March during strong frosts and in December show that this species of Gamasoidea possesses a comparatively high vital activity in winter as well and can, apparently, in certain years propagate in the field-vole nests both in summer and during the whole winter.
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