Revival of the Afrotropical genus <i>Tenuicosta</i> Stein from synonymy and description of <i>T. hairya</i> sp. n. (Diptera: Muscidae) from Madagascar

Close examination of the muscid genus Tenuicosta Stein confirms it as distinct from Coenosia Meigen and it is here revived as a separate genus. Tenuicosta ( status revivisco ) is marked by combination of only two postsutural dorsocentral setae, costa only reaching apex of vein R4+5, absence of median posterior seta of mid tibia and presence of a strong and long posterior seta close to the base of mid tibia. These features occur in the genus Coenosia either very rarely or not at all, and certainly not in such a combination. In addition, Tenuicosta hairya sp. n. is described as the second species of Tenuicosta .