Читать книгу A Manual of Philippine Birds - Richard C. McGregor - Страница 108

 a1. Feathers of neck normal, not bifurcated; wing-coverts without shaft-stripes.b1. Larger, length, 300 mm. or more; outermost rectrices with narrow white tips. Streptopelia (p. 54)b2. Smaller, length, 240 mm. or less; outermost rectrices with wide white ends. Œnopopelia (p. 56)

 a2. Feathers of neck bifurcated; wing-coverts with dark shaft-stripes; edge of wing pale pearl-gray. Spilopelia (p. 56)