330 CHECK-LIST OF NOHTH AMERICAN BIRDS. 



a. [Cinclus mexicanus mexicanus. Extralimital.] 



6. Cinclus mexicanus unicolor Bonaparte. Dipper. [701.] 



Cinclus unicolor Bonaparte, Zool. Joum., Ill, 1827, 52, 53. ("Athar 

 pescow Lake," probably near the source of the Athabaska River.) 



Range. — Hudsonian, Canadian, and Transition zones in mountains of 

 western North America from near tree limit in northwestern Alaska, north- 

 eastern British Columbia, and west central Alberta south to northern Lower 

 California and southern New Mexico; accidental in the Black Hills, South 

 Dakota, and in western Nebraska. 



Family MIMID.^. Thrashers, Mockingbirds, etc. 



Genus OREOSCOPTES Baird. 



Oreoscoptes Baird, Rep. Expl. & Surv. R. R. Pac, IX, 1858, xix, xxxv, 

 346. Type, by monotypy, Orpheus montanus Townsend. 



Oreoscdptes montanus (J. K. Townsend). Sage Thrasher. [702.] 



Orpheus montanus Townsend, Joum. Acad. Nat. Sci. Phila., VII, 1837, 

 192. (Sandy Creek, Lat. 42° N., Long. 109° 30' W., Wyoming.) 



Range. — Arid sagebrush plains and foothills of western United 

 States. Breeds in Transition and Upper Sonoran zones from south- 

 ern British Columbia, central Montana, and western Nebraska south 

 to east central California and northern New Mexico; winters from 

 southern California and mountains of central Texas to northern Mexico 

 (Chihuahua and Tamaulipas), and Cape San Lucas, and casually to 

 Guadalupe Island. 



Genus MIMUS Boie. 



Mimus Boie, Isis, XIX, 1826, 972. Type, by monotypy, Turdus poly- 

 glottos LinNjEu.s. 



Mimus polygl6ttos (LinnjEus). 

 Range. — United States south to the West Indies and Mexico. 



