LSJ
Adv., (< ἔνιοι) in some places, c. gen., τοῦ Λιβυκοῦ χωρίου Hdt. 2.19; τῆς Κύπρου Id. 1.199.
sometimes, Plu. 2.427f, Ath. 11.478b.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
an manchen Stellen, Her. 2.19 ; τῆς Κύπρου 1.199 ; – zuweilen, Ath. XI.478b.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)