Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Lyrcēĭus or Lyrcēus, a, um, adj., Lyrcean, of or near the Mount Lyrceum (Λύρκειον) between Arcadia and Argolis: tellus, Val. Fl. 4, 355: Lyrcea arva, Ov. M. 1, 598.
Lyrcīus or Lyrcēus (Lyrcaeus), i, m., a fountain in the Peloponnesus: aret Lyrcius (Lyrceus), Stat. Th. 4, 711.