(syn. Buteo Ϯ Hawaiian Hawk B. solitarius) Gr. ονυξ onux, ονυχος onukhos claw ( cf. ονυχοειδης onukhoeidēs like a nail); "Genus ONYCHOTES, Ridgway. ¶¶ Nostril nearly circular, with a conspicuous (not central) tubercle. Tarsus very long and slender; toes moderate; claws very long, strong and sharp, but only slightly curved. ... ¶¶. Onychotes, Ridgway, Nov. Gen. (Type O. gruberi ...)" (Ridgway 1870).