Empusa

(Ἔμπουσα). A monstrous spectre, which was believed by the Greeks to devour human beings. It was said to be sent by Hecaté and to assume various shapes, being sometimes known as Ὀνοκώλη, Ὀνοσκελίς, “Donkey-footed.” (See Aristoph. Ran. 293; Eccl. 1056). By some it was identified with Hecaté herself. See lamiae; mormolycea.