ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
(1) Panthūs¹³ (Πάνθους), vocat. ū, m., Panthoüs [fils d’Othrys et père d’Euphorbe] : Virg. En. 2, 319 ; Hyg. Fab. 115.(2) Panthus, ī, m., nom d’homme : Prop. 2, 17, 1.