Ἐχίων
From LSJ
ἡ Νέμεσις προλέγει τῷ πήχεϊ τῷ τε χαλινῷ μήτ' ἄμετρόν τι ποιεῖν μήτ' ἀχάλινα λέγειν → Nemesis warns us by her cubit-rule and bridle neither to do anything without measure nor to be unbridled in our speech
English (Slater)
Ἐχῑων son of Hermes, an Argonaut.
1 πέμψε δ' Ἑρμᾶς χρυσόραπις διδύμους υἱοὺς ἐπ ἄτρυτον πόνον, τὸν μὲν Ἐχίονα, κεχλάδοντας ἥβᾳ, τὸν δ Ἔρυτον (P. 4.179)