Prosomphax is a very small genus in the geometer moth family (Geometridae). As of 2005, only four species had been described; all are found in the southern half of Africa. This little-studied genus belongs to the emerald moth subfamily (Geometrinae), but beyond that its relationships are still rather obscure. The species of Prosomphax are: \n* Prosomphax callista Warren, 1911 \n* Prosomphax deuterurga Prout, 1922 \n* Prosomphax anomala (Warren, 1902) \n* Prosomphax horitropha Krüger, 2005