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The Aphthona cookei species-group from Sub-Saharan Africa, comprising some pests of Jatropha curcas L., is herein analyzed and revised. This species-group includes: Aphthona cookei (Gerstaecker, 1871), A. dilutipes Jacoby, 1906, A. nigripes (Allard, 1890), A. thikana Bryant, 1940, A. usambarica Weise, 1902, A. weisei (Jacoby, 1899b), A. whitfieldi Bryant, 1933 and the new species A. namibiana sp. n. from Namibia. The following new synonymies are proposed: Aphthona cookei (Gerstaecker, 1871)=Aphthona weisei abokana Bechyné, 1959 syn. n.; Aphthona dilutipes Jacoby, 1906=Aphthona damarorum Weise, 1914 syn. n.; Aphthona nigripes (Allard, 1890)=Pseudeugonotes vannutellii Jacoby, 1899a syn. n. A key to the species, micrographs of male and female genitalia, scanning electron micrographs of peculiar morphological characters, and distributional and ecological data are supplied. Finally, the results of a discriminant analysis using six morphological characters are also reported.
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