Materiały do poznania ważek (Odonata) Lubelszczyzny. IV. Kolekcja Jurija Michailowica Kolosowa

The author discusses one of the oldest well preserved collection of dragonflies from Poland, collected in the years 1899– 1915. Kolosov (1892–1943) was a Russian entomologist connected with the School of Agriculture and Forestry in Puławy. He published the description of migration of Libellula quadrimaculata through Puławy, mentioning incidentally 18 other species (Kolosov 1915). His collection is preserved in the Museum and Institute of Zoology of Polish Academy of Sciences. It consists of 102 specimens, belonging to 34 species. The collection is incomplete, as evidenced by the lack of many common species: the fauna of the studied area had at least over 40 species and the material was mainly collected in the valley of the central River Vistula in the vicinities of Puławy (51°25’N, 21°58’E). The collection of Kolosow is a unique record of the old composition of the valley of the River Vistula, with the great share of non-recorded contemporary tyrphophilous dragonflies as well as lacustrine species associated with moderately eutrophic oxbows (e.g. Nehalennia speciosa, Aeshna juncea, Epitheca bimaculata, Leucorrhinia spp.). The record of Orthetrum albistylum is also valuable – then it was the northernmost site in the whole range of this species.