1. A son of Apollo and Melia, who is said to have given his name to the Boeotian river which was before called Ladon or Cadmus. (Hesych. s. v.; Paus. ix. 10. § 5.)
2. A surname of Apollo at Thebes, who had a temple on the river Ismenus. (Paus. ii. 10. § 4, iv. 27. § 4, ix. 10. §§ 2, 5.) The sanctuary of the god, at which the Daphnephoria was celebrated, bore the name of Ismenium, and was situated outside the city.