GAME-BIRDS. 19 
the female being barred with rufous. The Guans (Ortalis) (538-55), of 
which three species are shown, are very similar birds to the two former, 
but there isa thin band of feathers down the middle of the naked 
throat, and no wattle. The remaining three genera, Pipile (56), 
Aburria (51), and Chamepetes (58, 59), are remarkable in having the 
inner web of the first two or three flight-feathers deeply excised. 
Suborder I]. ALecrororopes. True Game-Brirps. 
This group includes the Pheasants, Partridges, and Grouse, which 
normally nest on the ground. They are characterised by having the 
hind toe (hallux) raised above the level of the other toes, and by 
having the inner notch of the breast-bone (sternum) more than half 
the length of the entire sternum. 
Family I. Puastanip#. Pueasants, Parrripers, anp Quaits. 
The large number of Game-Birds comprising this family are 
distinguished from the Grouse by the following characters. ‘The 
nostrils are never hidden by feathers, and the legs are either feathered 
partially as in the Snow-Partridges (Lerwa) (164) or wholly naked and 
often armed with one or more pairs of spurs. The toes are always 
devoid of feathers and never pectinate along the sides, the horny 
comb-like appendages so characteristic of the Bare-toed Grouse being 
invariably absent. 
This great family has been divided into the subfamilies Odonto- 
phorine, Phasianine, and Perdicine, the first containing the American 
Partridges and Quails, the second the Pheasants and Peacocks with 
their allies the Turkeys and Guinea-Fowls, and the third the Old- 
World Partridge-like forms. 
Subfamily I. Odontophorine. American Partridges and Quails. 
The American Partridges (Odontophorine) are distinguished by 
having the cutting-edge of the lower mandible serrated or provided 
with a tooth-like process, well marked in the great majority of species, 
but im some instances less distinct. 
The Sealy Partridge (Callipepla squamata) (60) is a native of the high 
barren plateaus of Mexico and the States immediately to the north. 
In both sexes the black edges to the feathers give the plumage a scaled 
appearance. 
Of the Crested Quails (Hupsychortyx) eight small species are known 
to inhabit Central America and the north-west of South America. An 
example of this group may be seen in the White-faced Crested-Quail 
(E. leucopogon) (62). 
c2 
{Case 9. | 
