92. Columba (Wood-pigeon, Stock-dove, Rock-dove). Bill moderate, straight at base, compressed, point deflected; tail nearly even; first primary much larger than sixth.
93. Turtur (Turtle-dove). Bill rather slender, tip of upper mandible gently deflected, that of lower scarcely exhibiting the appearance of an angle; tail rather long, graduated.
FAMILY PTEROCLIDÆ
94. Syrrhaptes (Sandgrouse). Bill small, gradually decurved; nostrils basal, hidden; wings long, pointed, first primary largest; tail of sixteen feathers, cuneate, central pair long; tarsi short, strong; feathered to toes; three toes, all in front; hallux obsolete; soles rugose; claws broad and obtuse.