BIRDS OF NORTH AND MIDDLE AMERICA 309 



/. Feathers of center of crown with broad brown edges ; crissiim 

 heavily marked (Tehuantepec, Oaxaca, to Tonala, Chiapas). 



Colinus virginianus coyolcos, ad. $ (p. 339) 

 //. Feathers of whole head and neck usually black, crissum scarcely 

 marked (Chicomuselo, Chiapas). 



Colinus virginianus nelsoni, ad. $ (p. 342) 

 cc. Abdomen not uniform hazel brown. 



d. Breast wood brown finely vermiculated with black. 

 e. A distinct, broad whitish malar stripe present; feathers of chin and 

 throat brownish basally. 

 /. Malar and postorbilal stripes heavily washed with buffy (western 



Nicaragua) Colinus leucopogon sclateri, ad. $ (p. 355) 



//. Malar and postorbital stripes white or only slightly tinged with 

 buffy (western Honduras). 



Colinus leucopogon leylandi, ad. $ (p. 353) 

 ee. White malar stripe broken and indefinite; feathers of chin and throat 

 white basally (plateau and western slope of Costa Rica). 



Colinus leucopogon dickeyi, ad. $ (p. 356) 

 dd. Breast not wood brown, but white, the feathers edged with black. 



e. Tail largely unspeckled (Yucatan exclusive of the Progreso region). 



Colinus nigrogularis caboti, ad. $ (p. 347) 

 ee. Tail largely speckled. 



/. Brown of hindneck and interscapulars paler — pale argus brown 

 (arid region about Progreso, Yucatan). 



Colinus nigrogularis persiccus, ad. $ (p. 350) 

 ff. Brown of hindneck and scapulars darker — rich chestnut (Guatemala, 



Honduras) Colinus nigrogularis nigrogularis, ad. $ (p. 350) 



bb. Chin and upper throat buffy. 



c. Abdomen more or less barred, not spotted, the middle of the abdomen only 

 lightly or not at all barred. 

 d. Breast with a distinct cinnamomeous wash. 



e. Upperparts (crown, nape, back, and wings) decidedly more grayish 

 than reddish brownish. 

 /. General coloration richer and darker, the ventral V-shaped bars deep 

 black (Mexican tableland from northern Jalisco and southern San 

 Luis Potosi to the Valley of Mexico). 



Colinus virginianus graysoni, ad. $ (p. 333) 

 ff. General coloration paler; the ventral V-shaped bars fuscous. 

 g. Pinkish cinnamon pectoral band well developed. 



h. Dorsal dark markings darker — fuscous-black (Arid Tropical 

 Zone from central Tamaulipas to eastern San Luis Potosi). 



Colinus virginianus maculatus, ad. 9 (p. 331) 

 hh. Dorsal dark markings paler — marbled with sayal brown. 



i. Pale edges of dorsal feathers white (southern Arizona and 

 northern Sonora). 



Colinus virginianus ridgwayi, ad. 9 (p. 344) 

 it. Pale edges of dorsal feathers grayish (central southern Texas 

 to northern and central Tamaulipas). 



Colinus virginianus texanus, ad. 9 (p. 323) 

 gg. Pinkish cinnamon pectoral band very faint (between Tropical Arid 

 and Lower Sonora Zones from central and southwestern 

 Tamaulipas to central eastern San Luis Potosi). 



Colinus virginianus aridus, ad. 9 (p. 332) 



653008°— 46 21 



