Eurytus (sometimes spelled Erytus or Eurytos) was the son of Hermes and Antianeira or Laothoe, and brother of Ekhion. He was one of the Argonauts, and also hunted the Kalydonian Boar. Eurytus' part in both was minimal but he is mentioned by Apollonius Rhodius in Argonautica.
Hermes & Either Antianeira or Laothoe
"Erytus and Echion, and with them on their departure their kinsman Aethalides went as the third;"
- Apollonius of Rhodes, Argonautica 1.51
Nor at Alope stayed the sons of Mercury, rich in corn-land, well skilled in craftiness, Eurytus and Echion, and with them on their departure their kinsman Aethalides went as the third
- Hyginus, Fabulae, 14