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31 species of mosquitoes have been found in an investigation of the mosquito fauna in the district of Schwerin, German Democratic Republic. 5 of these species have been found responsible for producing pests: Aedes cantans, A. annulipes, A. cataphylla, A. punctor and Culex pipiens. At the same time an ecological investigation of the breeding places of the mosquitoes was carried out (measurement of acidity and chlorid ions). A large chemical uniformity of the breeding places was found. The relatively high frequency of 5 species of Anopheles, especially of the A. maculipennis group, in close proximity to densely populated areas is discussed with regard to the recent situation of malaria. Further investigations of the Anopheles populations of the district capital are to be expected.

With 482 catches between 1949 and 1984, 26 species of the family Culicidae were proved in the district of Leipzig. Anopheles was found in 9 subdistricts. The species were registered according to the subdistrict or region where caught. The species caught in the GDR and in Berlin (West) after 1948/49 were arranged in a table which also includes the authors of catching-publications. Further information on some species has been provided. The findings are documented by cryptograms and adequate symbolic parts.