Passage 5.23.5
ἀνάκειται τὸ Κλεοσθένους· τούτου μὲν δὴ ἡμῖν καὶ ἐν τοῖς ἔπειτα ἔσται μνήμη, τὸ δὲ ἄγαλμα τοῦ Διὸς Μεγαρέων μέν ἐστιν ἀνάθημα, ἀδελφοὶ δὲ αὐτὸ Ψύλακός τε καὶ Ὄναιθος καὶ οἱ παῖδες οἱ τούτων εἰργάσαντο· ἡλικίαν δὲ αὐτῶν ἢ πατρίδα ἢ παρʼ ᾧ τινι ἐδιδάχθησαν, οὐκ ἔχω δηλῶσαι.
There is also dedicated a statue of Cleosthenes; I shall have occasion to mention this Cleosthenes again later on. The statue of Zeus is an offering of the Megarians, and it was made by the brothers Psylacus and Onaethus, together with their sons. However, I cannot specify their period, their city of origin, nor from whom they learned their craft.