Читать книгу A Manual of Philippine Birds - Richard C. McGregor - Страница 44

 a1. General color green or greenish yellow; rectrices fourteen, under coverts usually equal to or longer than shortest rectrix; third primary deeply scooped near middle of inner web.b1. Horny nail of bill reaching feathers of forehead Treron (p. 25)b2. Horny nail of bill not reaching feathers of forehead.c1. Tail slightly graduated; under tail-coverts broadly streaked, the shafts black Sphenocercus (p. 26)c2. Tail square; under tail-coverts not streaked, the shafts of the same color as the webs Osmotreron (p. 26)

 a2. General color brown; rectrices twelve, under coverts shorter than shortest rectrix; third primary not scooped Phapitreron (p. 29)