The poorly studied orthocentrine genus Stenomacrus Förster, 1869 is reported from Kenya and Burundi for the first time. Eight new species are described and illustrated: S. clypeatus sp. nov. from Burundi as well as S. communis sp. nov., S. glabratus sp. nov., S. luteus sp. nov., S. pronotalis sp. nov., S. scutellaris sp. nov., S. valvator sp. nov., and S. vuriaensis sp. nov. from Kenya. An identification key to species occurring in Africa and adjacent territories is provided.
Darwin wasps, biodiversity, new species, key, Afrotropical region.