All the North American Quails, except Cyrtonyx massena, have the inner tertiaries edged internally with whitish or buff, forming a conspicuous line on each side of the rump when the wings are closed.
Genus ORTYX, Stephens.
Ortyx, Stephens, Shaw’s Gen. Zoöl. XI, 1819. (Type, Tetrao virginianus, L.)
Gen. Char. Bill stout. Head entirely without any crest. Tail short, scarcely more than half the wing, composed of moderately soft feathers. Wings normal. Legs developed, the toes reaching considerably beyond the tip of the tail; the lateral toes short, equal, their claws falling decidedly short of the base of the middle claw.
The genus Ortyx embraces numerous species, more or less resembling the well-known Bob-white of the United States. They are chiefly confined to Mexico, Central America, and the West India Islands. North America and the West India Islands contain but one species, and this is so exceedingly variable in plumage that it is only at extreme points of its range that differences acquire sufficient constancy to be considered worthy of especial notice. The regions of its extremes of variation are the northeastern, southeastern, and southwestern limits of its range; the modifications attaining in Cuba and in Texas sufficient value to have been deemed of specific importance. But comparing even the three extremes of plumage, the differences are found to consist only in a varying amount of the several colors, specimens from intervening regions forming the connecting links.
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Ortyx virginianus.