Passage 1.31.5
πυνθανόμενος δὲ σαφὲς οὐδὲν ἐς αὐτὰς ἐπισταμένους τοὺς ἐξηγητὰς εὗρον, αὐτὸς δὲ συμβάλλομαι τῇδε. ἔστιν Ἀμάρυνθος ἐν Εὐβοίᾳ· καὶ γὰρ οἱ ταύτῃ τιμῶσιν Ἀμαρυσίαν, ἑορτὴν δὲ καὶ Ἀθηναῖοι τῆς Ἀμαρυσίας ἄγουσιν οὐδέν τι Εὐβοέων ἀφανέστερον· ταύτῃ μὲν γενέσθαι τὸ ὄνομα ἐπὶ τούτῳ παρὰ Ἀθμονεῦσιν ἡγοῦμαι, τὴν δὲ ἐν Μυρρινοῦντι Κολαινίδα ἀπὸ Κολαίνου καλεῖσθαι. γέγραπται δʼ ἤδη μοι τῶν ἐν τοῖς δήμοις φάναι πολλοὺς ὡς καὶ πρὸ τῆς ἀρχῆς ἐβασιλεύοντο τῆς Κέκροπος· ἔστι δὲ ὁ Κόλαινος ἀνδρὸς ὄνομα πρότερον ἢ Κέκροψ ἐβασίλευσεν ---ὡς οἱ Μυρρινούσιοι λέγουσιν---ἄρξαντος.
When I inquired about them, I found that the guides could offer no definite information at all, but my own conjecture is this: there is a place called Amarynthos in Euboea, and indeed the inhabitants there honor Amarysia. The Athenians themselves also celebrate the festival of Amarysia, no less prominently than the Euboeans. I suppose, therefore, that the place-name among the Athmonians originated from this. The site called Kolainis in the deme of Myrrhinous, I believe, derived its name from Kolainos. I have already stated in my account of the demes that many assert there were rulers prior even to the reign of Kekrops; and Kolainos, according to the people of Myrrhinous, was the name of a man who ruled before Kekrops began his kingship.