Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Perseus.
Ĕlymāis, ĭdis, f., = Ἐλυμαΐς, a district of Persia, in the west of the modern province of Iran, Plin. 6, 25, 28, § 111 al.
Hence, Ĕlymaeus, a, um, adj., = Ἐλυμαῖος, Elymaean, Liv. 37, 40.
Plur. subst.: Ĕlymaei, ōrum, m., the inhabitants of Elymaïs, Liv. 35, 48 al.