Abstract
Lyonetia ledi Wocke, 1859 is a very rare and little-known member of the Palearctic fauna. The populations can be very inconspicuous and can therefore have been passed unnoticed during previ-ous field studies. It is emphasized that the Palaearctic fauna further study and that habitats of Lyonetia ledi and other rare or declining species may yet be found. In Central Europe, Lyonetia ledi is very spo-radically distributed in only a few isolated localities. It is critically endangered in Switzerland, Austria, the Czech Republic, and Germany. It is considered an extinct species in Romania. Its occurrence in Hungary is based on an erroneous report. The centres of its European range are the Polish lowlands, the Baltic region, and the marshy, swampy areas of Scandinavia. The plains of Eastern Europe are little known and almost unexplored, although there are many potential habitats. The study of the vast Asian territories of Russia has much to offer. With 21 figures.
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