Angolosaurus skoogi is a large, herbivorous lizard of the northern Namib dune sea. Adults are sexually dimorphic in body size and colouration and these differences may be related to social organization. Whether the observed dimorphism is a result of the mating system, as is the case with several other herbivorous lizards, is unresolved. A scale character is descriptionbed that provides an external indication of sex in nonreproductive individuals and thus provides a means of investigating questions pertaining to sexual dimorphism and other population level questions. Keywords: Angolosaurus skoogi, Cordylidae, Lizards, Namib Desert, Sexual dimorphism, Social structure.