Abstract
The paper includes the following species: Isotoma antennalis (Bagnall, 1940), I. blufusata Fjellberg, 1978, I. divergens Axelson, 1900, I. fennica Reuter, 1895, I. germanica Hüther & Winter, 1961, I. hiemalis Schött, 1893, I. infuscata (Murphy, 1959), I. nanseni Fjellberg, 1978, I. neglecta Schäffer, 1900, I. nivea Schäffer, 1896, I. olivacea Tullberg, 1871, I. propinqua Axelson, 1902, I. ruseki n.sp., I. tigrina (Nicolet, 1842), I. tshernovi Martynova, 1974 and I. violacea Tullberg, 1876. A key for separation of the species is given.

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