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190 B. HOHORST & R. VAN DEN ElZEN The most important ofthese records are perhaps those exception of the Aquatic Warbler. The former occur- of Black Grouse, Lyninis tetrix, Capercaillie, Tetrao rence and breeding records of these reed dwelling urogalliis. Ferruginous Duck, Aythya nyroca and ecological specialists are evidence ofundisturbed nat- Aquatic Warbler, Acrocephaliis pahidicola. ural habitat conditions during that period. Black Grouse and Capercaillie were scarce breeders Acknowledgements in the Rhein-Wupper region even in former days. Frey (1948) collected a male Black Grouse in This work would never have been possible without the help of B. Hohorst's former assistants Barbara Enders, Hartmut 17.04.1926 at Reuschenberg, his last field observa- Schmiese and Valentin Steinmiiller. Warmest thanks for tions stemming from 1933. The Capercaillie speci- their great efforts to reconstruct the Frey collection! men, a female from Kirchen a. d. Sieg, collected November 1926, is now lost. All recorded Capercail- Literature lie individuals are treated by Frey (1948) as strag- Frey, P. (1948): Die Vogelfauna von Leverkusen und glers from the Sauerland area. Umgebung. Selbstverlag. A nest of Aythya nyroca was secured by R Frey in Glutz von Blotzheim, U. (1966-1997): Handbuch der Vögel Mitteleuropas, 14 Bde, Akademische Verlagsge- June 1937 in Reuschenberg, when the clutch was sellschaft/Aula-Verlag, Wiesbaden. destroyed during hay-harvest. This is the first and sole Glutz von Blotzheim, U. (1969): Handbuch der Vögel certain breeding record of the Femiginous Duck for Mitteleuropas, Bd. 3: Anseriformes (2. Teil), Akade- the whole RJieinland area (Glutz von Blotzheim mische Verlagsgesellschaft, Wiesbaden. MiLDENBERGER, H. (1982-1984): Die Vögel des Rheinlan- 1969). des. Kilda-Verlag, Greven. The specimen ofthe Aquatic Warbler was mounted in Neubaur, f. (1957): Beiträge zur Vogelfauna der ehemali- a showcase together with Savi's Warbler, Lociistella gen Rheinprovinz. Decheniana 110: 1-278. luscinioides. Grasshopper Warbler, Lociistella naevia. Sedge Warbler, Acrocephaliis schoenobaemis. Marsh Warbler, Acrocephaliispalustris. Reed Warbler, Acro- Dr. Behrend Hohorst, Rheinisches Archiv- und cephaliis scirpaceiis. Great Reed Warbler, Acro- Museumsamt, Abtei Brauweiler, Ehrenfriedstraße 19, cephaliis anindinaceiis and Blue-Throat, Liiscinia D-50259 Pulheim. cyaneciila. All were collected in the Wupper estuaries and swamp areas at Leverkusen-Wiesdorfand -Bürrig Dr. Renate van den Elzen, Zoologisches Forschungs- between 1906 and 1931. Their status is given (Frey institut und Museum Alexander Koenig, Adenauer- 1948) as common to regular breeding species with allee 160, D-53113 Bonn, r.elzen.zfmk(¿^uni-bonn.de