BIRDS OF NORTH AND MIDDLE AMERICA 277 



KEY TO THE FORMS (ADULTS) OF THE GENUS LOPHORTYX 



a. Breast feathers with a scalloped pattern like those of abdomen. 

 b. Crest usually uniform dark sepia to fuscous (Sonora). 



Lophortyx douglasii bensoni, 9 (p. 302) 

 bb. Crest usually spotted or incompletely barred with dull tawny. 

 c. Brown of underparts darker — dark olive-brown. 

 d. With a wing tip (the primaries extending beyond the secondaries in the 

 folded wing) of 15-20 mm. (Naj'arit). 



Lophortyx douglasii impedita, ? (p. 304) 

 dd. With little or no wing lip (northwestern Jalisco). 



Lophortyx douglasii teres, $ (p. 303) 

 cc. Brown of underparts paler— olive-brown to pale olive-brown (Sinaloa). 



Lophortyx douglasii douglasii, ? (p. 299) 

 aa. Breast feathers uniform gray or brownish gray. 

 b. Flanks dark chestnut. 



c. Throat solid black rimmed with white. 



d. Upper back gray with little or no olive wash. 

 e. Anterior upperparts between neutral gray and light neutral gray (Tibu- 

 ron Island, Gulf of California). 



Lophortyx gambelii pembertoni, $ (p. 297) 

 ce. Anterior upperparts between ncutural gray and light mouse gray (west- 

 ern Colorado) Lophortyx gambelii sana, $ (p. 297) 



dd. Upper back gray with a distinct olive wash. 



e. Abdomen deep buffy in fresh plumage (southern Sonora). 



Lophortyx gambelii fulvipectus, $ (p. 296) 

 ec. Abdomen pale buffy in fresh plumage. 



/. Paler, the elongated feathers of sides and flanks between Sanford's 

 brown and chestnut (western Texas, extreme soutiieastern New 



Mexico) Lophortyx gambelii ignoscens, $ (p. 298) 



//. Darker, the elongated feathers of sides and flanks between chestnut 

 and bay (Utah, southern Nevada, New Mexico, southern Cali- 

 fornia; south to northeast Baja California, north-central Sonora, 

 and extreme northwestern Chihuahua). 



Lophortyx gambelii gambelii, $ (p. 291) 

 cc. Throat buffy or grayish lightly streaked with dusky gray. 



d. Crown sepia (western Colorado) . .Lophortyx gambelii sana, ? (p. 297) 

 dd. Crown cinnamon-drab. 



e. Anterior upperparts with little or no ohlivaceous wash (Tiburon Island). 



Lophortyx gambelii pembertoni, 9 (p. 297) 

 ee. Anterior upperparts with an olivaceous wash. 

 /. Abdomen pale buffy in fresh plumage. 

 g. Paler, elongated feathers of sides and flanks between Sanford's 

 brown and chestnut (western Texas, extreme southeastern New 



Mexico) Lophortyx gambelii ignoscens, 9 (p. 298) 



gg. Darker, elongated feathers of sides and flanks between chestnut and 

 bay (southern Utah, southern Nevada, southern California, most 

 of New Mexico, Arizona, southern to central Sonora, north- 

 eastern Baja California, and northwestern Chihuahua). 



Lophortyx gambelii gambelii, 9 (p. 291) 

 //. Abdomen deep buffy in fresh plumage (southern Sonora). 



Lophortyx gambelii fulvipectus, 9 (p. 296) 



653008°— 46 19 



