CYRTONYX. 193 



mottled, the feathers with white shaft-streaks, widening at end, 

 and with a dusky spot on each side ; belly dull white,°without 

 trace of markings ; chest brownish gray, the feathers tipped 

 and streaked with whitish. Length about 9.50-10.00, wino- 

 4.45-4.70, tail 4.10-4.70, tarsus 1.20-1.25. Eggs 1.25 X .94, sinT- 

 ilar to those of C. californica, but usually with deeper ground- 

 color and larger and more distinct spots. Hab. Northwestern 

 Mexico and contiguous portions of United States, from Arizona 

 to western Texas, north to southern Utah. 



295. C. gambeli (Nutt.). Gambel's Partridge. 

 e 2 . Crest buffy or ochraeeous ; throat white, spotted with black, and ter- 

 tials blotched with chestnut, in adult male. 



Adult male : Sides of head streaked with black and white ; hind- 

 neck broadly streaked or striped with bluish gray and rusty ; 

 upper parts mainly grayish brown, the tertials and longer 

 scapulars chestnut, broadly edged on both webs with white; 

 breast and belly bluish gray, the latter marked with roundish 

 spots of white; flanks mainly deep cinnamon-rufous, the 

 feathers edged, or spotted along edges, with white ; wing 4.25- 

 4.50, tail 3.50-3.60, tarsus 1.25. Hab. "Western Mexico (vicinity 

 of Mazatlan). 



C. elegans (Less.). Elegant Partridge. 1 



a 2 . Tail less than two-thirds as long as wing ; flanks broadly and sharply banded 



with black and white ; tail-feathers brownish, barred with dusky and 



whitish ; scapulars and tertials spotted with black, the inner webs of the 



latter without light edging; wing less than 4.00; sexes alike in plumage ; 



crest narrow, distinct from feathers of crown, but with webs not appressed. 



(Subgenus Philortyx Gould. 2 ) 



b l . Cheeks, chin, and throat white ; bill black ; wing 3.80-3.90, tail 2.40-2.60, 



tarsus 1.10-1.12. Sab. Southwestern Mexico (Plains of Colima, etc.). 



C. fasciata (Gould). Banded Partridge. 8 

 b 2 . Cheeks, chin, and throat black; bill brownish; wing 3.80, tail 2.00, tarsus 

 1.00. Hab. Southeastern Mexico (Pueblo). 



C. personata Ridow. Black-faced Partridge.* 



Genus CYRTONYX Gotjld. (Page 185, pi. LVL, fig. 2.) 



Species. 



Common Characters. — Adult males : Sides of head marked with bold black and 

 white stripes, the chin and throat, and narrow collar across fore-neck (ascending to 

 beneath crest), intense velvety black; longer feathers of crest uniform brownish; 



1 Ortyx elegans Less., Cent. Zool. 1832, pi. 61. Callipepla elegant Gould, Mon. Odont. 1850, pi. 18. 

 s Philortyx Gould, Mon. Odont. 1850, 17. Type, Ortyx fasciatue Gould. 



3 Ortyx faeeiatue Gould, P. Z. S. 1843, 133. 



4 Philortyx pertonatut Ridgw., Auk, iii., July, 1886, 333. 



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