COLINVS. lg9 



c 1 . Adult males with throat-patch and broad superciliary stripe always 

 white. 

 d\ Very similar in color to 0. 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). Sab. South- 

 western Mexico, from. San Luis Potosi, Guanajuato, and Guada- 

 lajara to Mazatlan ; Sonora ; southern Arizona ? 



290. C. graysoni (Lawr.). Grayson's Bob White. 

 d 2 . 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. Sab. Southeastern Mexico (Vera 

 Cruz). 



C. pectoralis (Got/ld). Black-breasted Bob White. 1 



c 2 . 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 G. 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. Sab. 



Southern Mexico (Tabasco and Tehuantepec). 



C. coyolcos (MiJLL.). Coyolcos Bob White. 2 

 d 2 . 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 G. 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). Sab. Sonora and southern 



Arizona 291. C. ridgwayi Brewst. Masked Bob White. 



a 2 . 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 Gould, P. Z. S. 1842, 182; Mon. Odont. 1850, pi. 5. 



2 Tetrao coyolcos (err. typ.) Mullee (Ph. St.), Nat. Syst. Suppl. 1776, 129. Tetrao coyolcos Gmel., S. N. 

 i. 1788, 763. Ortyx coyolcos Godijd, Mon. Odont. 1850, pi. 6. Golinus coyolcos Bbewst., Auk, ii. Apr. 1885, 

 200 (in text). 



