Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Pantăgĭas, Pantăgĭes, and Pan-tăgia, ae, m., = Πανταγίης, Πανταγίας, a small river in the eastern part of Sicily, between Megaris and Syracuse, now Fiume di Porcari: ostia Pantagiae, Verg. A. 3, 689 Serv.; (acc. -ien) Ov. F. 4, 471; (acc. -iam) Claud. Rapt. Pros. 2, 58.