Passage 9.2.1
γῆς δὲ τῆς Πλαταιίδος ἐν τῷ Κιθαιρῶνι ὀλίγον τῆς εὐθείας ἐκτραπεῖσιν ἐς δεξιὰ Ὑσιῶν καὶ Ἐρυθρῶν ἐρείπιά ἐστι. πόλεις δέ ποτε τῶν Βοιωτῶν ἦσαν, καὶ νῦν ἔτι ἐν τοῖς ἐρειπίοις τῶν Ὑσιῶν ναός ἐστιν Ἀπόλλωνος ἡμίεργος καὶ φρέαρ ἱερόν· πάλαι δὲ ἐκ τοῦ φρέατος κατὰ τὸν Βοιωτῶν λόγον ἐμαντεύοντο πίνοντες.
Within Plataean territory, after turning a short distance to the right from the direct path on Mt. Cithaeron, lie the ruins of Hysiae and Erythrae. These cities once belonged to the Boeotians, and even now among the ruins of Hysiae there remains a half-built temple of Apollo and a sacred well. In ancient times, according to the Boeotian account, those who drank from this well practiced divination.