The birds of the genus Carpodacus differ from those of the genus Propasser in having a longer and more pointed wing, the secondaries falling short of the tip of the wing by a distance greater than the length of the tarsus, and in having no supercilium.
Key to the Species.
a. Wing under 3.5 C. erythrinus, p. 219.
b. Wing considerably over 4 C. severtzovi, p. 220