Onymacris laeviceps Gebien is an endemic tenebrionid beetle of the sand dunes of the central Namib Desert. In our study area it was most frequently associated with mobile slipfaces near dune crests. When not on the surface, the beetles bury themselves within the sand dunes. During February and March (late summer), these beetles had a bimodal daily activity pattern and their movements appeared to be correlated with temperature.