Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Perseus.
The word Spercheïdes could not be parsed. Trying a normal dictionary lookup:
No entries found. Showing closest matches:
Sperchēos (-ēus) or Sperchīus (-īos, v. Neue, Formenl. 1, 127 sq.), i, m., = Σπερχεῖος, a river of Thessaly, rising on Mount Pindus, now the Ellada; form -eos, Verg. G. 2, 487; Rib., Forb. (al. Sperchius); form -eus, Liv. 36, 14, 15 Weissenb.; 37, 4, 10; form -ios, Mel. 2, 3, 6; Plin. 4, 7, 23, § 28 (v. C. infra), Ov. M. 1, 579; form -ius, Stat. Th. 4, 838.
Hence,