Lewis & Short

Stymphālus, i, m., or Stymphā-lum, i, n., = Στύμφαλος, a district in Arcadia, with a town, mountain, and lake of the same name, celebrated in fable as the haunt of a species of odious birds of prey, very vexatious to the inhabitants, but which were finally destroyed by Hercules, Plin. 4, 6, 10, § 20; Suet. Vit. Ter. 5; Stat. S. 4, 6, 100; id. Th. 4, 298; Claud. Idyll. 2, 1.
Plur.: Stymphala, Lucr. 5, 30.
Hence,

  1. A. Stymphālĭcus, a, um, adj., of or belonging to Stymphalus, Stymphalian: aves, Plaut. Pers. 1, 1, 4.
  2. B. Stym-phālĭus, a, um, adj., Stymphalian: monstra, Cat. 68, 113.
  3. C. Stymphālis (scanned Stymphălis, Aus. Idyll. 19, 5), ĭdis, adj. f., of Stymphalus, Stymphalian: undae, Ov. M. 9, 187; id. F. 2, 273; cf. Plin. 2, 103, 106, § 227: silva, Ov. M. 5, 585: aves, Hyg. Fab. 20; 30; cf. Serv. Verg. A. 8, 300.
    Called, absol.: Stymphalides, Mart. 9, 102, 7; Claud. Rapt. Pros. 2, prooem. 37.
    Sing., Sen. Phoen. 422; id. Agam. 849 al.