Tail of sixteen feathers, rounded. Outer quills attenuated and sickle-shaped. One species.
F. falcipennis. Male 16 1/3". Female 14 3/4". The Sharp-winged Grouse. Chest uniform smoky black. —Female: Chest black, barred buff Regarded as the representative form of C. canadensis in the Old World. N. E. Siberia, Kamschatka, and Saghalien Island.