Passage 1.38.4
ἔστι δὲ Ἱπποθόωντος ἡρῷον, ἀφʼ οὗ τὴν φυλὴν ὀνομάζουσι, καὶ πλησίον Ζάρηκος. τοῦτον μαθεῖν παρὰ Ἀπόλλωνι μουσικήν φασιν, ἐγὼ δὲ ξένον μὲν ἀφικόμενον ἐς τὴν γῆν Λακεδαιμόνιόν τε εἶναι δοκῶ καὶ Ζάρακα ἐν τῇ Λακωνικῇ πόλιν ἀπὸ τούτου πρὸς θαλάσσῃ καλεῖσθαι· εἰ δέ τις Ζάρηξ ἐπιχώριος Ἀθηναίοις ἥρως, οὐδὲν ἐς αὐτὸν ἔχω λέγειν.
There is also a hero-shrine of Hippothoön, from whom the tribe takes its name, and beside it one of Zarex. They say that he learned music from Apollo, but I myself am inclined to think that he was a foreigner who came to this land, and was originally a Laconian, and that the town called Zarex by the sea in Laconia was named after him. However, if there is any native Attic hero named Zarex, I have nothing to say concerning him.