COLINUS. 189 
ec. Adult males with throat-patch and broad superciliary stripe always 
white. 
a’, Very similar in color to C. virginianus texanus, but darker, the 
female hardly distinguishable from the same sex of that species, 
the male, however, very differently colored beneath, the lower 
parts being uniform cinnamon or cinnamon-rufous ; wing 4.10- 
4.50 (4.39), tail 2.50-3.00 (2.83), culmen .55-.60 (.58), tarsus 
1.06-1.40 (1.23), middle toe 1.05-1.23 (1.12). Hab. South- 
western Mexico, from San Luis Potosi, Guanajuato, and Guada- 
lajara to Mazatlan. 
C. graysoni (Lawr.). Grayson’s Bob White. 
@. Similar to C. graysoni, but still darker in color, with the black 
across fore-neck spread downward over the chest, and the size 
decidedly smaller; wing about 3.80-4.00, tail 2.05, culmen .60, 
tarsus 1.10, middle toe 1.05. Hab. Southeastern Mexico (Vera 
Cruz). 
C. pectoralis (GouLD). Black-breasted Bob White.! 
c, Adult males with whole under side of head black, the white superciliary 
stripe usually much reduced in width or sometimes obsolete. 
d'. Smaller and darker. Adult male with black of throat extended 
over the breast (as in C. pectoralis), and feathers of breast, etc., 
sometimes margined with black; wing 4.00-4.20, tail 2.25-2.60, 
exposed culmen .50-.55, tarsus 1.10, middle toe .95-1.05. Hab. 
Southern Mexico (Tabasco and Tehuantepec). 
C. coyolcos (MULL.). Coyolcos Bob White.? 
d@. Larger and much lighter colored. Adult male with black of throat 
not extended over chest, which is entirely uniform cinnamon or 
cinnamon-rufous, like other lower parts. Female hardly dis- 
tinguishable from that of C. virginianus texanus, but usually 
with a more decided pale cinnamon band or patch across 
upper part of chest and the belly more distinctly and heavily 
barred. Wing 4.40-4.70 (4.49), tail 2.70-3.00 (2.81), culmen 
.52-.65 (.60), depth of bill at base .32-.40 (.35), tarsus 1.12-1.30 
(1.18), middle toe 1.00-1.10 (1.06). Had. Sonora and southern 
Arizona......... 291. C. ridgwayi Brewst. Masked Bob White. 
a’, Adult male with feathers of sides and flanks white centrally, with broad rufous 
margins. Adult female with feathers of sides and flanks clear umber-brown 
centrally, this enclosed within a broad U-shaped mark of black, the edges 
broadly white. 
Adult male: Sides of forehead, superciliary stripe, lores, cheeks, and whole 
chin and throat, uniform black ; broad stripe along each side of crown and 
1 Ortyx pectoralis Gouup, P. Z. S. 1842, 182; Mon. Odont. 1850, pl. 5. 
2 Tetrao coyoleos (err. typ.) MUtuer (Pu. Sr.), Nat. Syst. Suppl. 1776, 129. Tetrao coyolcos Gunu., 8. N. 
i. 1788, 763. Ortyx coyolcos GouLD, Mon. Odont. 1850, pl. 6. Coliénue coyolcos Brewst., Auk, ii. Apr. 1885, 
200 (in text). 
