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In this paper the authors consider sex ratio in populations of the bloodsucker of the genus Ornithomya Latreille located in the Vladimir and Murmansk Regions. During the ringing of birds since 2014 we have been collecting the bloodsucker flies parasitizing on them. For just four years in the Vladimir Region we have examined 12515 birds, from which 94 females and 17 males of the bloodsucker Ornithomya avicularia L., 1758, as well as 142 females and 37 males Ornithomya fringillina Curtis, 1836,doi:10.17816/snv201981114 fatcat:skxyqk4pqbadbmjmxopskonpca