29 



The Quails, Partridges, and Grouse (family Tetraonidce) form 

 three subfamilies ; the first, Perdicince, consists of the true Quails 

 and Partridges, and is confined to the Old World, where it is 



Fig. 9. Calit'urnia Partridge. 



numerously represented (about one hundred species), and em- 

 braces many genera ; it includes the Crested Wood-Quails or 

 Roulrouls, the Francolins, and the so-called Snow Pheasants, etc., 

 as well as the ordinary Quails and Partridges. (See Case O.) The 



