Five new species of Pseudomezium Pic (Coleoptera: Ptinidae: Ptininae), a genus endemic to South Africa

Five new species of the South African endemic spider beetle genus Pseudomezium Pic are described from Western Cape province. They altimontanum, glabrum, periculum, stenochasma and swartbergense. Illustrations external morphology male genitalia each provided, as well a distribution map. An updated key to all is provided. Four previously established names in corrected because their Code-incompliance. These after mandatory nomenclatural correction brunneaurantiacum Smiley & Philips for “Pseudomezium brunneaurant”; diteinum diteinus”; dolichotrichinum dolichothrixus”; polyomorphum polyomorphus.” The diversity beetles Africa also summarised.