Metisella meninx, the marsh sylph, is a butterfly of the Hesperiidae family. It is endemic to the wet vleis (shallow lakes) of highland grassland in northern KwaZulu-Natal, Mpumalanga, Gauteng, the northern part of the Orange Free State and the extreme east of the North West Province. It has become extinct in many areas close to Johannesburg due to building developments. The larvae feed on Poaceae marsh grass species, including Leersia hexandra.