Four new species of the genus Ceutorhynchus (Coleoptera: Curculionidae) from the western Palaearctic

Four new species close to the Ceutorhynchus assimilis (Paykull, 1792) species group are described here: Ceutorhynchus armeniacus sp. nov. from Armenia lives on Alyssum (Brassicaceae), and is most similar to the West Palaearctic C. griseus C. Brisout de Barneville, 1869 and to C. montanus Colonnelli, 1997 from the Balkans. Ceutorhynchus crassulicola sp. nov. from the Canary Islands is related to the Palaearctic C. assimilis and the Central Asian C. confusus A. Schultze, 1903. Ceutorhynchus davidorum sp. nov. from Greece lives on Alyssum, is related to the West Palaearctic C. griseus and is also somewhat similar to the East European C. nigritulus A. Schultze, 1897. Ceutorhynchus dobrogeaensis sp. nov. from Romania lives on Lepidium perfoliatum (Brassicaceae), and is related to the East European and Central Asian C. difficilis A. Schultze, 1898 and to the Palaearctic C. assimilis.