Passage 6.8.2
ἐς δὲ πύκτην ἄνδρα, γένος μὲν Ἀρκάδα ἐκ Παρρασίων, Δάμαρχον δὲ ὄνομα, οὔ μοι πιστὰ ἦν πέρα γε τῆς ἐν Ὀλυμπίᾳ νίκης ὁπόσα ἄλλα ἀνδρῶν ἀλαζόνων ἐστὶν εἰρημένα, ὡς ἐξ ἀνθρώπου μεταβάλοι τὸ εἶδος ἐς λύκον ἐπὶ τῇ θυσίᾳ τοῦ Λυκαίου Διός, καὶ ὡς ὕστερον τούτων ἔτει δεκάτῳ γένοιτο αὖθις ἄνθρωπος. οὐ μὴν οὐδὲ ὑπὸ τῶν Ἀρκάδων λέγεσθαί μοι τοῦτο ἐφαίνετο ἐς αὐτόν, ἐλέγετο γὰρ ἂν καὶ ὑπὸ τοῦ ἐπιγράμματος τοῦ ἐν Ὀλυμπίᾳ· ἔχει γὰρ δὴ οὕτως· υἱὸς Δινύτα Δάμαρχος τάνδʼ ἀνέθηκεν εἰκόνʼ ἀπʼ Ἀρκαδίας Παρράσιος γενεάν. τοῦτο μὲν δὴ ἐς τοσοῦτο πεποίηται·
Regarding the boxer named Damarcus, a man of Arcadian lineage from Parrhasia, I could not accept as credible, beyond the fact of his victory at Olympia, all the additional claims made by boastful men—that during the sacrifice to Lycaean Zeus he transformed from a man into the shape of a wolf, and that ten years afterward he became once again a human. Indeed, it seemed to me that the Arcadians themselves did not tell this story concerning him, for such a thing would then have been mentioned in the inscription at Olympia, which reads thus: "This statue was dedicated by Damarcus, son of Dinytas, a Parrhasian of Arcadia." And certainly, this inscription says no more than that.