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In this paper I deal with three cases of indirect tradition of Sophocles’ Oed. Col. (vv. 312, 390, 900). I argue that a thorough investigation of the remains of an ancient commentary on Sophocles (presumably that of Didymus) as traceable in the scholia and in the lexica (especially Hesychius’ lexicon) can shed new light on both the Sophoclean vocabulary and the text of the paraliterary sources connected with the tragedy.