Many species of Dermestidae have not been adequately described to facilitate current taxonomic studies. According to the World Catalogue of Dermestidae, the whereabouts of the holotype of Dermestes undulatus is not known. In the current study, a neotype is raised for taxonomic stability. In addition to the nominate species, three new species are described, one from North Africa and a further two from Kazakhstan. Species are identified by the structure of the male genitalia. The distributions of all four species are provided.