Lewis & Short

Thēŏdămas, antis, m., = Θειοδάμας, king of the Dryopes, and father of Hylas, Hyg. Fab. 14; 271.
Hence, Thēŏdă-mantēus, a, um, adj., of or belonging to Theodamas, Theodamantean: Hylas, i. e. the son of Theodamas, Prop. 1, 20, 6 (Thiodamanteus, Müll.).