The Subfamily Coccothraustinae contains those Finches which are characterized by a very large bill. They are birds of con¬siderable size and rather bright coloration and, in all the Indian species, the sexes differ from one another. They have only one moult a year.
Key to Genera
A. Tips of inner primaries and outermost secondaries square or sinuated ; margin of upper mandible not toothed near gape……………Coccothraustes. p. 99.
B. Tips of all wing - quills rounded or pointed; margin of upper mandible sinuated or toothed near gape.
a. Difference between wing and tail about equal to length of tarsus........Perissospiza, p. 101.
b. Difference between wing and tail about equal to twice length of tarsus. Mycerobas, p. 105.