In that same paper, he described three additional moths that are not currently considered valid taxa: "Sphinx caffra" (a junior homonym to "Sphinx caffra" Linnaeus, 1764), "Sphinx scabiosae" (synonymous to "Zygaena purpuralis" per Naumann & Tremewan, 1984) and "Sphinx schaefferi" ("Zygaena ephialtes", also per Naumann & Tremewan, 1984)