BIRDS OF NORTH AND MIDDLE AMERICA. 



079 



[Cinclm'] mexicanu.'i ^chATKR and Salvin, Noni. Av. Xt-otr., 1873, 3. 



Clinclujf] me.ricantiK Coues, Key N. Am. Birds, 2(1 e<l., 1884, 255, part (Mexico; 



(tuateniala) ; 5th ed., i, 1903, 260, jiart.— KiixiWAV, Man. X. Am. Birds, 1887, 



538, part (Mexico; (Tiiatemala). 

 [Cinclns ine.ricantts'} var. tnccicanns Ji\ui\), Brkwkk, and Rii)C.\vay, Hist. X. .\iii. 



Bird.s, i, 1874, 50, part. 

 IHi/drohaia] mexicana Gkw, Hand-list, i, 1809, 207, no. 3905, part. 



CINCLUS MEXICANUS UNICOLOR ( Bonaparte). 

 AMERICAN DIPPER. 



Similar to C. m. mexicanuH^ but ])iil('r. with color of head and neck 

 decidelly less brown; young with under parts very much paler, exten- 

 sively suffused or mottled with buff'y white or very pale cinnamon- 

 l)utf, the chin and throat mainly (sometimes entirely) white or butfy 

 white; under wing-coverts with much more white (mostly of this color). 



Adult waZ^.— Length (skins), 155-192 (173); wing, 83-100 (90.9); 

 tail, 43-50 (49.1); exposed culmen, 1()-19 (17.3); tarsus, 25-31 (28.8); 

 middle toe, 18-23.5 (21.3)." 



Adult female.— \^Qx\^t\\ (skins), 148-182 (166.9); wing, 79-92 (89.1); 

 tail, 41-55 (46.7); exposed culmen, 16-18 (17.2); tarsus, 26-30 (27.9); 

 middle toe, 18.5-22 (19.9).'^ 



Mountains of western North America, from Rocky Mountains (includ- 

 ing Black Hills of South Dakota) to the Pacific coast, and from the 



"Twenty-two specimens. 

 '^Twenty-five specimens. 

 Series from different geographic areas average respectively a.s follows: 



Locality. 



Ex- 

 posed 

 culmen. 



Tarsus, ^^^^f^ 



Nine adult males from California 



Three adult mules from Vancouver Island and southern 



Alaska 



Four adult males from Alaska (north and west of peninsula) 

 Si.K adult males from Rocky Mountains (Montana to New 



Mexico) 



Ten adult females from California 



One adult female from Nevada 



One adult female from eastern Oregon (Fort Klamath) 



One adult female from British Columbia 



Four ad\ilt females from .\laska (north and west of penin- 

 sula) 



Kight adult females from Kocky .Mountains (>rontana to 

 New Mexico) 



29.3 



28.3 

 28 



17,2 

 16.7 



17.5 



17 27.7 



16 26.5 



16.5 I 28 



17. 5 28 



17.5 

 17.4 



28 

 28.4 



21 

 20.2 



22.3 



19.8 

 20 

 21 

 20 



20.1 



21.2 



I have not been able to satisfy myself a.s to any difference in colorafion, though 

 possibly those from the Pacific coa.«t (which are smaller than tho.«e from the Kixky 

 Mountain district) are slightly darker, with the head and neck less distinctly brownish. 



