190 NORTH AMERICAN BIRDS. 
occiput, another from beneath eye across ear-coverts, and ground-color 
of chest, dull white; middle of crown and occiput rusty brownish, mixed 
with dusky; feathers of hind-neck and upper back rufous, each marked 
with. a central oval spot of rusty white; feathers of breast and belly 
white centrally, broadly bordered with black. Adult female: Very simi- 
lar to same sex of C. virginianus cubanensis, but smaller, the sides and 
flanks less barred with black, more white on breast, and ground-color of 
upper parts clearer grayish. Wing 4.00-4.20, tail 2.25-2.60, culmen .60, 
tarsus 1.12-1.20, middle toe 1.05-1.10. Hab. Yucatan. 
C. nigrogularis (GouLD). Yucatan Bob White.! 
Genus OREORTYX Barry. (Page 185, pl. LVI, fig. 3.) 
Species. 
Adult male: Upper parts plain brown or olive, the inner webs of the tertials 
broadly edged with buffy or ochraceous, producing, when wings are closed, a dis- 
tinct stripe on each side of rump; breast and part of head plumbeous ; crest black ; 
entire throat uniform rich chestnut, growing blackish along upper posterior border, 
and sending a blackish branch up to the eye; chin, anterior portion of malar region, 
lower portion of lores, and distinct line bordering the throat-patch from the pos- 
terior angle of the eye downward, white; flanks rich chestnut, broadly barred with 
black and white; thighs rufous, and under tail-coverts black. Adult female: Hardly 
distinguishable in color from the male, but crest usually smaller. Young: Head, 
neck, and back grayish brown, speckled with white; breast more decidedly gray, 
with larger, more triangular, white spots; throat and cheeks mixed whitish and 
dusky ; crest-feathers blackish, their tips speckled or zigzagged with pale fulvous; 
scapulars, wing-coverts, tertials, and tail-feathers pale brownish, finely vermiculated 
with dusky, the first more or less blotched with black, and the tertials edged with 
the same, with a subedging of pale fulvous; belly whitish; flanks washed with 
chestnut; a dusky patch on ear-coverts, with a whitish line just above. Downy 
young: Head and neck light brownish buff, deeper on lores, forehead, and a very 
broad superciliary stripe, the space enclosed between the two latter, of opposite 
sides, and also a broad stripe down middle of back and rump, dark chestnut, bor- 
dered along each side by blackish; a broad pale buffy or dull whitish stripe along 
each side of rump, throwing off, at about midway of its length, a lateral branch 
obliquely across the flanks, this last also bifurcating at about the middle and throw- 
ing off posteriorly a broad stripe parallel with that of the rump, the space between 
the two, and also that bordering the outer side of anterior half of rump-stripe and 
anterior edge of main flank-stripe, brownish black, or dark seal-brown ; on side of 
head, behind eye, a broad V-shaped mark of brownish black, having its apex at the 
posterior corner of the eye; breast and belly dull grayish white. Length about 
10.50-11.50, wing 5.25-5.40, tarsus 1.18-1.40. 2ggs 1.36 x 1.02, cream-color, or 
creamy buff, varying as to depth of color. 
1 Ortyx nigrogularis Gout, P. Z. 8, 1842, 181; Mon. Odont. 1850, pl. 4, 
