[1] That of an ugly, lower-class character in Homer, Iliad 2.212ff, who is punished for venturing to speak rather than listening respectfully to his betters; cf. alpha 4366, tau 368 (and chi 191), omega 237 (and see generally OCD(4) s.v., where it is pointed out that in post-Homeric tradition he rises in status).
[2] cf. Appendix Proverbiorum 3.19: a proverb directed at the very ugly.