Passage 5.7.8
πρῶτος μὲν ἐν ὕμνῳ τῷ ἐς Ἀχαιίαν ἐποίησεν Ὠλὴν Λύκιος ἀφικέσθαι τὴν Ἀχαιίαν ἐς Δῆλον ἐκ τῶν Ὑπερβορέων τούτων· ἔπειτα δὲ ᾠδὴν Μελάνωπος Κυμαῖος ἐς Ὦπιν καὶ Ἑκαέργην ᾖσεν, ὡς ἐκ τῶν Ὑπερβορέων καὶ αὗται πρότερον ἔτι τῆς Ἀχαιίας ἀφίκοντο καὶ ἐς Δῆλον·
First, Olen the Lycian, in the hymn he composed to Achaia, sang that Achaia came to Delos from these Hyperboreans. After this, Melanopus of Cyme composed a song about Opis and Hekaerge, telling that these women, too, came from the Hyperboreans to Delos even earlier than Achaia.