Kevan 1959. A study of the genos Chrotogonus Audinet-Serville, 1839 (Orthoptera: Acridoidea: Pyrgomorphidae). V. A revisional monograph of the Chrotogonini. VI. The history and biogeography of the Chrotogonini. Publicacoes Culturais da Companhia de Diamantes de Angola, no. 43 1959: 11-199