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Acknowledgements - Our sampling was made in the frame of a bio-mathematical project (OTKA T043168, 2003-2006) led by Prof. Dr. JÁNOS IZSÁK (Berzsenyi College, Szombathely). We are grateful for Mrs ZSUZSANNA BAJZA-PAPP for her help with the sample collection at the price of great efforts. Mr. GÉZA BAJZA's help in forming and preparing the sample collection device was precious and indispensable. Our thanks are due to the assistants of the Diptera Collection, HNHM, Mrs JUDIT GALAMBOS, Mrs ZSUZSA PETROVICS and Mrs ESZTER ZAHORÁNSZKY-VIDA for the careful and precise work in mounting, labelling, etc. The assistance of Mrs ANIKÓ KOROKNAI is also acknowledged. REFERENCES IZSÁK, J. & PAPP, L. 2008: Species abundance distribution in a multispecies fly community. Biodiversity and Conservation: in press MAHUNKA, S. 1983 (ed.): The Fauna of the Hortobágy National Park. Volume 2. - Akadémiai Kiadó, Budapest, 489 pp. PAPP, L. 1971: Ecological and production biological data on the significance of flies breeding in cattle droppings. - Acta Zoologica Academiae Scientiarum Hungaricae 17: 91-105. PAPP, L. 1976: Ecological and zoogeographical data on flies developing in excrement droppings (Diptera). - Acta Zoologica Academiae Scientiarum Hungaricae 22: 119-138. PAPP, L. 1985: Flies (Diptera) developing in sheep droppings in Hungary. - Acta Zoologica Academiae Scientiarum Hungaricae 31(4): 367-379. PAPP, L. 1992: Fly communities in pasture dung: some results and problems (Diptera). - Acta Zoologica Academiae Scientiarum Hungaricae 38( 1 -2): 75-88. PAPP, L. 1999: "Outlaws": some evolutionary aspects of rarity in insects. - Tiscia 31 [1998]: 29-33. PAPP, L. 2004: An overview of the Sepsis species (Diptera, Sepsidae) of Hungary. - Folia entomologica hungarica 65: 129-134. SoÓS, Á. 1981: Data to Muscidae Acalyptratae (Diptera) in the Hortobágy National Park, I. In: MAHUNKA, S. (ed.): The Fauna of the Hortobágy National Park, I. Akadémiai Kiadó, Budapest, pp. 213-222.