S. Mahunka szerk.: Folia Entomologica Hungarica 60. (Budapest, 1999)

FOLIA ENTOMOLOGICA HUNGARICA ROVARTANI KÖZLEMÉNYEK LX 1999 pp. 187-194 Potamophilus acuminatus (Fabricius, 1792) and Macronychus quadrituberculatus P. W. J. Müller, 1806: new records from Hungary (Coleoptera: Elmidae) T. Kovács, A. Ambrus and O. Merkl Potamophilus acuminatus (Fabricius, 1792) and Macronychus quadrituberculatus P. W. J. Müller, 1806: new records from Hungary (Coleoptera: Elmidae) — A number of new localities of the two species (25 of Potamophilus acuminatus, 33 of Macronychus quadrituberculatus) from Hungary are given, with an assessment of the locality data presented here and in the literature. Distribution is depicted in UTM maps. INTRODUCTION Potamophilus acuminatus (Fabricius, 1792) and Macronychus quadrituberculatus R W. J. Müller, 1806 (Figs 1-2) are riffle beetles rare all over Europe and considered to have disappeared from or to be extinct in some countries (Jäch 1992). Recent records of Potamophilus acuminatus in Europe were reported by Kodada (1991) and Gerber (1993). During the research of aquatic insects of Hungary carried out in the last decade, these rare elmid species were recorded from a number of new localities. Voucher specimens are deposited in the Hungarian Natural History Museum (Budapest) and in the Mátra Museum (Gyöngyös). The data are presented in the following sequence: name of settlement: closer locality, river, UTM code, date of collecting, name of collector (number of specimens). In the case of old specimens, certain data are not always stated on the labels of specimens. The names of settlements are listed in alphabetical order. Abbreviations: AA = András Ambrus, BCs = Béla Csányi, KB = Károly Bánkuti, PJ - Péter Juhász, TK = Tibor Kovács jun., TKs = Tibor Kovács sen., LN = László Nagy, AV = András Varga; + * = coexistence with Aphelocheirus aestivalis (Fabricius, 1803) (Heteroptera: Aphelocheiridae). Potamophilus acuminatus (Fabricius, 1792) (Fig- 1) Literature data — Kodada and Merkl (1996) mentioned one specimen which was singled in 1954 around Jávorkút in the Bükk Mts by Z. Kaszab and V. Székessy.