The flat rock scorpion, Hadogenes taeniurus (Thorell, 1876), is redescribed, based on an examination of approximately 250 specimens from Angola and Namibia. Hadogenes angolensis Lourengo, 1999 is demonstrated to be a junior synonym. The distribution of H. taeniurus is mapped, and notes on its ecology and conservation status are provided. The synonymy of Hadogenes bifossulatus Roewer, 1943 with Hadogenes tityrus (Simon, 1888), rather than with H. taeniurus, is confirmed. Keywords: Scorpiones, Liochelidae, Hadogenes taeniurus, Hadogenes tityrus, synonymy, Angola, Namibia.