The western Etosha NationaI Park may be divided into three physiographic regions, viz. the coastal desert, the escarpment and the inland plateau. A study area was selected on the transition between the escarpment and the inIand plateau. The soils tend to be shallow, alkaline, high in water-soluble salts, poor in phosphates and nitrogen content. The study area falls within the arid savanna. The vegetation is sub-divided into nine smaller associations.
Available information indicates that the black rhinoceros was formerly distributed from the Kunene River south to the Orange River, along the escarpment and eastwards past Gobabis. At present its distribution is limited to the northwestern corner of South West Africa. Apparently the black rhinoceros population never reached very high numbers in South West Africa. During 1966 there were only 90 animals left in the territory.
A new species named Linognathus damarensis is descriptionbed from the Damara dikdik. The new species belongs to the pithodes species-group, and a key to the latter is provided. Because of the discontinuous distribution of the host, a detailed examination of the lice on the isolated populations might provide useful information on the rate of speciation of the parasites.
A new louse named Prolinognathus schulzi is descriptionbed from hyraxes in South West Africa and the Cape Province. The new species is closely related to Prolinognathus leplocephalus (Ehrenberg), which is parasitic on hyraxes in the Middle East. The latter species is redescriptionbed and a neotype designated.