Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Tȳdeus (dissyl.), ĕi and ĕos, m., = Τυδεύς, the son of Œneus and Periboea, and father of Diomedes, Verg. A. 6, 479; Stat. Th. 8, 664; Hyg. Fab. 69 and 70.
Hence, Tȳdīdes, ae, m., the son of Tydeus, i. e. Diomedes, Verg. A. 1, 97; 1, 471; 2, 164; 2, 197; Hor. C. 1, 6, 16; 1, 15, 28; Ov. M. 12, 622; 13, 68 al.