A new species, which may already be extinct, of flightless Trox, T. youngai sp.n., is described based on specimens collected 30 years ago from a now severely transformed area in South Africa. It is one of seven members of the natalensis-group of Trox species. All have very localised distributions in small fragments of once considerably larger habitats along the greater eastern escarpment and the coastal edge of southern Africa. is description brings the total number of endemic flightless Trox in the region to 14. A key to the species in the natalensis-group is provided. Furthermore, pronotal and elytral features of diagnostic value are tabulated to aid in the identification of members of this group. All species are illustrated by photographs of habitus and male aedeagi. A map is provided showing the distributions for each of them.