Tóth Sándor: A Bakony természettudományi kutatásának eredményei 25. - A Bakonyvidék zengőlégy faunája (Diptera, Syrphidae) (Zirc, 2001)

HOVERFLY FAUNA OF THE BAKONY REGION (SUMMARY)

Hoverfly fauna of the Bakony region (Diptera: Syrphidae) Historical background First data on hover flies of the mountains were due to Gusztáv Redl entomologist from Tapolca who collected different insects, mainly butterflies in and around Tapolca in the 1880's and 90's. In his work which is primarily interesting from the historical point of view (REDL 1894) the following five hoverfly species are mentioned: Volucella zonaria (Poda, 1761), Syrphus pyrastri [=Musca (Scaeva) pyrastri Linnaeus, 1758)], Syrphus ribesii (Linnaeus, 1758), Eristalis campestris Meigen, 1822 [= Eristalis tenax (Linnaeus, 1758)], Cheilosia soror (Zetterstedt, 1843). Dipterofaunistic knowledge of the end of the 19

th century is summarized by the part dealing with dipterans (THALHAMMER 1900) of the monograph entitled Fauna of the Hungarian Empire (Fauna Regni Hungáriáé). However, this basic work involves data only on 4 species from the Bakony Mts: Baccha elongata (Fabricius, 1775), Chrysotoxum elegáns Loew, 1841, Sphiximorpha (Ceria) subsessilis (Illiger in Rossi, 1807) from Tapolca and Merodon albifrons Meigen 1822 from Kup. Collection work aiming at true mosquitos and chironomids were begun in the 1930's, covering mainly the region of Lake Balaton but also involving Bakony Mts to a smaller extent. The resulting publication on the wider Bakony region (SZILÁDY 1941) comprises data on rather numerous, exactly 40 hover fly taxa from the northern shore of Lake Balaton, especially from Tihany. Significant dipterological collection works were initialized in the Bakony at the late 1950's, as part of a national program which was aimed at supplying the fly collection of the Museum of Natural History. This collection was destroyed in 1956. Systematic research work on the Diptera fauna of the mountains was started only in 1964, in the frame of the program entitled „The nature-landscape of the Bakony". Within this, intense collection of hoverflies has been done basically since the late 1970's. As a result of this work, the Bakony Museum of Natural History is in possession of a collection consisting of app. 60000 specimens. Somewhat more than one third of this collection falls to hover flies. The idea came already in the middle 1970's that this dipteran family which is very rich is species in the mountains could be represented in a separate volume in the monograph series entitled "Results of the natural scientific research in the Bakony". By processing the hoverfly collection from the Bakony (most of the collection can be found in the Bakony Museum of Natural History but smaller part is kept in the Hungarian Museum of Natural History in Budapest) shorter papers were published on the topic (TÓTH 1978, 1982, 1983, 1985a, 1985b, 1989, 1990, 1994, 1997). They mention the occurrence of altogether 159 species in the mountains, 37 taxa found here were published as new to the fauna of Hungary. Further 4 species being new to the fauna are reported by this paper: Cheilosia himantopus (Panzer, 1798), Platycheirus jaerensis Nielsen, 1970, Sericomyia silentis (Harris [1776]), Sphiximorpha binominata (Verrall, 1901). Geography of the region From geographical point of view, the Bakony Mts. are the most significant middle region of the Transdanubian Mts. They are bordered by the Balaton and Mezőföld on the south and south-east, by the Mór rift valley on the east, by the Igmánd-Kisbéri basin on the