Further information on the Dohrn-Keulemans collection of birds from the Cape Verde Islands

Until recently, only one specimen from the series of syntypes of the Cape Verde Cane Warbler Acrocephalus brevipennis, collected by H. Dohrn and J.G. Keulemans in 1865, was known to be still in existence. Another specimen belonging to this series has now been discovered in the collections of the Berlin museum. Some additional information on the Dohrn-Keulemans collection is given, based on listings in the old catalogues of this museum.