Читать книгу A Manual of Philippine Birds - Richard C. McGregor - Страница 131

 a1. No frontal shield.b1. Bill more slender; exposed culmen equal to middle toe without claw. Hypotænidia (p. 66)b2. Bill stouter; exposed culmen much less than middle toe without claw.c1. Culmen not swollen at base; wing less than 140 mm.d1. Tarsus longer than middle toe with claw. Rallina (p. 69)d2. Tarsus about equal to middle toe with claw or shorter.e1. Culmen decidedly longer than hind toe with claw; under tail-coverts banded with white.f1. Smaller; wing, 90 mm. or less; forehead, throat, and breast slate-gray. Porzana (p. 71)f2. Larger; wing, 100 mm. or more; forehead, throat, and breast chestnut. Limnobænus (p. 73)e2. Culmen but little longer than hind toe with claw; under tail-coverts unbanded. Poliolimnas (p. 73)c2. Culmen slightly swollen at base but not forming a frontal shield; wing more than 150 mm. Amaurornis (p. 75)

 a2. Frontal shield present; legs and feet long and heavy.b1. Nostrils elongate; frontal shield narrower; terminal half of bill green or yellowish green.c1. Under tail-coverts pure white; tarsus less than 65 mm. Gallinula (p. 77)c2. Under tail-coverts not white; tarsus more than 75 mm. Gallicrex (p. 78)b2. Nostrils small and circular; frontal shield wider; bill all red. Porphyrio (p. 80)