(Ὄνασος), the author of a work on the Amazons, entitled Ἀμαζονίς or Ἀμαζονικά, which was supposed by Heyne (ad Apollod. 2.5.9) and others to have been an epic poem; but it has been observed by Welcker (Epische Cyclus, p. 320) and Grote (Hist. of Greece, vol. i. p. 288), that we may infer from the rationalising tendency of the citation from it (Schol. ad Theocr. 13.46; Schol. ad Apollon. Rhod. i. 1207, 1236), that it was in prose.
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890