The Macroscelididae of the Early and Middle Miocene of the Orange River (Namibia) are known from two localities, Auchas Mine and Arrisdrift. They are well represented at Arrisdrift by more than 400 dental and postcranial specimens. Among them, the hypsodont macroscelidid, Myohyrax oswaldi is particularly abundant. The Miorhynchocyoninae are rare and are represented by a few bracryodont specimens for which a new species is erected, Miorhynchocyon gariepensis. A fairly complete skull and some isolated upper incisors are tentatively allocated to this new taxon. The great hypsodonty of the myohyracids suggest that these animals were adapted to herbivory; they probably ate hard grass or seeds. This is compatible with the environmental reconstructions based on other mammals and plants. The miorhynchocyonines possibly ate soft bodied insects and possibly worms.