Aspects of habitat, population, and water balance in a harpagophorid millipede (probably Harpagophora nigra Attems) were studied from winter-collected specimens in the Namib Desert. Most individuals were relatively small occupying soil adjacent to granite boulders of an inselberg at Mirabib Hills. Keywords: Apodous, Granitic boulders, Gut contents, Haemolymph osmolality, Inselberg populations, Metazoan symbionts, Ocelli, Podous diplosegments, Thelastomatid nematodes, Water uptake.