We describe a new species of vespertilionid bat from Guinea and Liberia, West Africa. In this context we evaluate previously described taxa from West Africa assigned to Pipistrellus, Neoromicia, and Hypsugo. Based on genetics, morphology and ecology we conclude that the taxon Pipistrellus eisentrauti bellieri should be elevated to species level, and that the taxa bellieri, crassulus, eisentrauti plus the new species form a monophyletic clade for which a new genus name is proposed. The new genus occurs in forested regions south of the Sahara from Senegal to Ethiopia and Somalia, from where further taxa remain to be described.