Hind toe lengthened, insistent. Tail-feathers twelve. Sides of
head and throat with naked spaces. Color greenish … _Cracidæ_.
Hind toe shortened, elevated. Tail-feathers usually fourteen
or more. No green.
Large. Tarsi, toes, and nasal fossæ naked. Head bare of
feathers, sparsely bristly, with wattles and caruncles. A
pectoral tuft of bristly feathers. Tarsi usually spurred in
the male. Plumage iridescent … _Meleagrididæ_.
Medium. Tarsi wholly or in great part, sometimes also the toes,
and always the nasal fossæ, feathered. Head completely
feathered, excepting a definite papillate strip over the eye.
Tail-feathers sixteen or more. Sides of neck usually with
lengthened feathers, or a naked distensible area, or both. No
spurs. Plumage without iridescence … _Tetraonidæ_.
Small. Tarsi, toes, and nasal fossæ naked. Head completely
feathered. No peculiar feathers or tympanum on sides of neck.
No spurs. Plumage not iridescent … _Perdicidæ_.