Revision of the Indo-african Pachycerus Schoenherr, with description of four new species (Coleoptera: Curculionidae: Lixinae).

The Indo-African species of the genus Pachycerus (Curculionidae: Lixinae: Cleonini) are revised. The identification of Cleonus senegalensis Gyllenhal, 1834 is discussed, its holotype rediscovered and the synonymy between C. senegalensis and Ammocleonus hieroglyphicus (Olivier, 1807) is confirmed. A neotype is established for Pachycerus opimus (Gyllenhal, 1834). Lectotypes for Pachycerus vestitus (Fåhraeus, 1834), P. badeni (Faust, 1888) and P. sellatus Faust, 1904 are designated. Pachycerus sahelicus sp. nov. (type locality: Senegal, Bambey), P. hippali sp. nov. (type locality: Saudi Arabia: Jeddah, Taif); P. barclayi sp. nov. (type locality: Southern India: Manapparai) and P. simonae sp. nov. (type locality: Morocco, Western Sahara, Cap Boujdour) are described. Some remarks on taxonomy and biogeography of the species are added.