[1] On ancient Libya see generally OCD(4) s.v. Tithrasos was a place or river there, according to gamma 391 (which even more than the present entry goes firmly -- but wrongly, thanks to misunderstanding the passage from Aristophanes about to be cited -- for a Libya/Gorgons connection).
[2] Aristophanes, Frogs 477 (web address 1); cf. tau 1124. "It is a fair inference from this passage that the women of that deme [see note 4 below] were popularly believed to be fierce and ugly" (K.J. Dover, Aristophanes Frogs, edited with an introduction and commentary) (Oxford 1993) 254).
[3] On Gorgons see generally gamma 390; OCD(4) s.v.
[4] (Present-day Pikermi.) J.S. Traill, The Political Organization of Attica (Princeton 1975) 41; D. Whitehead, The Demes of Attica (Princeton 1986) index s.v.