54 GAME BIRDS OF NORTH AMERICA. 
CALLIPEPLA SQUAMATA CASTANEIGASTRA. 
Geographical Distribution.—Lower Rio Grande Valley, Texas, 
Northeastern Mexico, 
Adu/t.—Head, brownish gray, darker than that of C. sgua- 
mata, and the throat is also a darker buff; the blue of the breast 
and back is more of a decided tint, as is also the brown of the 
wings and lower back; lower parts, dark buff, ochraceous in some 
specimens, with a more or less extensive patch of rusty chestnut 
on the belly; upper tail-coverts and tail, bluish gray; there is 
more white on the crest, in certain examples, the feathers being 
nearly all white; in general appearance this is a darker bird than 
the typical style, but the chestnut patch varies greatly in extent 
among individuals, being reduced at times to barely a trace, and 
the two styles grade into each other by imperceptible degrees, 
until it is impossible to designate where one ends and the other 
begins; in size the two forms are about equal, and there is no 
difference in the color of plumage or style of markings between 
the sexes. 
