LAND BIRDS. 



KEY TO THE SPECIES. 



Family TETRAONID^. Grouse, Partridges, 

 Quails, etc. 



Toes, four, the hind toe elevated above the rest; bill, rather short 

 and stout; wing, short and somewhat rounded, the outer primaries 

 curved; wing, less than 12 inches long; body feathers, double. In 

 Eastern North America divided into two subfamilies, which may be 

 recognized as follows: 



(a) Tarsus, not feathered; wing, less than 6 inches long (carpus 

 to tip). Subfamily PERDICINjE. "Quail" and Partridges. 



(6) Tarsus, more or less feathered; wing, more than 6, but less 

 than 12 inches long. 



Subfamily TETRAONIN^E. Grouse, Ptarmigan,*etc. 



GROUP 1. Wing, less than 5 inches long. 



