ἴτας, ἰέναι: Protagoras follows the etymology; ἴτης: ἀντὶ τοῦ ἰταμός, σκληρός, τολμηρός, καὶ δἰ αὐτῶν χωρῶν τῶν πραγμάτων Schol. Ar. Nub. 445. In Symp. 203 d, Eros is described as ἀνδρεῖος ὢν καὶ ἴτης καὶ σύντονος bold, reckless, and alert.
εἰ μὴ μαίνομαί γε: cf. Euthyd. 283 e ἦ δοκεῖ σοι οἷόν τ᾽ εἶναι ψεύδεσθαι; Νὴ Δία, ἔφη, εἰ μὴ μαίνομαί γε, Rep. X. 608 d σὺ δὲ τοῦτ᾽ ἔχεις λέγειν; Εἰ μὴ ἀδικῶ γ̓, ἔφην.
τὸ μέν τι: not adverbial acc., but nom., as αὐτοῦ shows. So ὅλον.