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The presence of the genus Nanna in Gabon is treated. Four species are recorded, two of which are new to science (N. molouba sp. nov. and N. semigrisea sp. nov.), and the hitherto unknown female of Nanna ceratopygia is described. A checklist and a key to the species of the genus Nanna are provided.
Arctiinae, Lithosiini, Nanna, new species, Afrotropical Region.