Two new species of the tribe Similipepsini (Lepidoptera: Sesiidae: Tinthiinae), Similipepsis gansoni sp. nov. and S. murzini sp. nov., are described and illustrated form central Africa (the banks of ...the Ubangi River) and Guinea, respectively. Similipepsis gansoni sp. nov. is somewhat similar to S. aureus (Gaede, 1929), but they differ from each other in the conformation of the transparent areas of the forewing, in the coloration of the abdomen, and in some details of the male genitalia. Similipepsis murzini sp. nov. is most similar to S. maromizaensis Bartsch, 2008, but they can be distinguished from each other by the coloration of the frons, thorax, and abdomen.
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