The recent collection of more than 50 specimens and more than 140 eggs of Tornier's cat-snake, Crotaphopeltis tornieri, together with an examination of material already deposited in various museums provides new records outside the previously known geographical range. Variation in external and internal characters has been examined and the results have been analyzed. In regard to several characters, including the internal ones, the population of the East Usambara Mountains in Tanzania is significantly different from the population of the West Usambara Mountains, probably indicating an early vicariance event between the two areas. Due to the lack of data relating to internal characters, the affinities of the populations further south remain obscure, and no nomenclatural conclusions have so far been reached. The recently acquired specimens provide new information on the natural history of the species.
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