Читать книгу A Manual of Philippine Birds - Richard C. McGregor - Страница 185

 a1. Crown black.b1. Larger; wing, 240 mm. or more.c1. Forehead black to base of culmen.d1. Larger; tarsus yellow or red; bill red in summer. hirundo (p. 89)d2. Smaller; tarsus blackish, bill black at all seasons. longipennis (p. 89)c2. Forehead white.d1. Lores white. boreotis (p. 90)d2. Lores black.e1. Wing, 265 mm.; mantle umber-brown. anæstheta (p. 91)e2. Wing, 300 mm.; mantle deep black. fuscata (p. 92)b2. Smaller; wing less than 200 mm. sinensis (p. 92)

 a2. Crown white. melanauchen (p. 93)