Passage 8.26.8
κατὰ δὲ τὴν ἐξ Ἡραίας ἄγουσαν ἐς Μεγάλην πόλιν εἰσὶ Μελαινεαί· ταύτας ᾤκισε μὲν Μελαινεὺς ὁ Λυκάονος, ἔρημος δὲ ἦν ἐφʼ ἡμῶν, ὕδατι δὲ καταρρεῖται. Μελαινεῶν δὲ τεσσαράκοντά ἐστιν ἀνωτέρω σταδίοις Βουφάγιον, καὶ ὁ ποταμὸς ἐνταῦθα ἔχει πηγὰς ὁ Βουφάγος κατιὼν ἐς τὸν Ἀλφειόν· τοῦ Βουφάγου δὲ περὶ τὰς πηγὰς ὅροι πρὸς Μεγαλοπολίτας Ἡραιεῦσίν εἰσιν.
Along the road leading from Heraea towards Megalopolis are the Melaineai settlements, founded by Melaineus, the son of Lycaon; but in my day these places were deserted, having been flooded by water. About forty stadia above Melaineai is Buphagium, where the river Buphagus, descending into the Alpheius, has its sources. Around the springs of the Buphागुस river are boundary markers between the Megalopolitans and the Heraeans.