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Addendum — Penicillidia monoceros Speiser, 1900 — Nr. 1. - 1 male: Lengyel, from male Nyctalus noctula, 28.11.1934.; Nr. 2.-1 male: Abaliget, Abaligeti-barlang from male Myotis dasycneme, 11.28.1956. Leg, det. Topái György. After the submission of the paper, the authors have learnt about the bat fly collection of the Hungarian Natural History Museum, consisting of 166 specimens, in canada balsam on slides (collected between 1856-1956), which includes Penicillidia monoceros, a new species for the fauna of Hungary. This has not been published yet, since the analysis and publication of the whole collection is in progress. REFERENCES Dudich E. (1925): A magyarországi denevérlegyek. [Nycteribiids of Hungary.] — Mathematikai és Természettudományi Értesítő 41: 144-151. [in Hungarian] Éhik Gy. & Dudich E. (1924): A magyarországi emlősök és azok külső rovarélősködőinek határozó táblái. [Identification keys for the mammals of Hungary and for their ectoparasitic insects.] Budapest, 76 pp. [in Hungarian] Hûrka, K. & Soós Á. (1986): Family Nycteribiidae, Subfamily Nycteribiinae. Vol. 11, pp. 226-233. — In: Soós Á. & Papp L. (eds): Catalogue of Palaearctic Diptera. Akadémiai Kiadó, Budapest, 346 pp. Kertész K. (1910): Magyarország szárnyatlan és csökevényes szárnyú legyei. [Wingless and reduced-winged flies of Hungary.] — Rovartani Lapok 17: 179-184. [in Hungarian] Soós Á. (1955): Bábtojó legyek (Muscidae: Pupiparae) — In: Magyarország Állatvilága (Fauna Hungáriáé). 15(17). Akadémiai Kiadó, Budapest, 20 pp. [in Hungarian] Speiser, P. (1901): Ueber die Nycteribiiden, Fledermausparasiten aus der Gruppe der pupiparen Dipteren. — Archiv für Naturgeschichte 67: 11-78. Theodor, O. (1967): An illustrated catalogue of the Rothschild collection of Nycteribiidae (Diptera). London: British Museum (Natural History), 506 pp. Theodor, O. & Moscona, A. (1954): On bat parasites in Palestine I.: Nycteribiidae, Streblidac, Hemiptcra, Siphonaptera. — Parasitology 44: 157-245. (Received: 26th April, 2001) Authors' addresses: Balázs CZUPPON Institute of Zoology Faculty of Veterinary Science Szent István University H-1077 Budapest, Rottenbiller u. 50. HUNGARY e-mail: bczuppon@univet.hu Viktor MOLNÁR Department and Clinic for Internal Medicine Faculty of Veterinary Science Szent István University H-1078 Budapest, István u. 2. HUNGARY e-mail: vmolnar@univet.hu