296 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



chiefly white, and third partly white; bill pale brownish or vinaceous 

 in dried skins, pinkish in life; iris brown; tarsi pale yellowish brown, 

 toes darker. 



Adults in winter. — Similar to summer adults, but plumage softer 

 and colors perhaps rather deeper, especially the gray of chest, etc. ; 

 tip of bill more or less dusky. 



You7ig in first winter. — Essentially like adults, but the gray of chest 

 and other under parts decidedly paler, less pure, and less strongly con- 

 trasted with the more buffy white of abdomen, etc. ; sides and flanks 

 more or less tinged with bufly or light cinnamon; reddish brown of 

 back duller; tertials broadly edged with cinnamon or cinnamon-brown; 

 bill rather darker, more extensively dusky at tip. 



Young. — Pileum and hindneck dull grayish, streaked with blackish; 

 sides of head and neck rather lighter grayish, more obsoletely streaked; 

 throat and chest pale grayish, streaked with dusky, the latter more 

 buffj', with the streaks broader or more wedge-shaped; sides and flanks 

 buffy grayish, streaked with dusky; back rusty brownish (approach- 

 ing mars brown), streaked with blackish; tertials broadly edged with 

 brown; otherwise much like adults, but bill more dusky brownish. 



Adult «!.a/e.— Length (skins), 142.75-157.23 (152.40); wing, 81.53- 

 86.61 (84.58); tail, 68.58-74.68 (72.14); exposed culmen, 10.67-11.94 

 (11.18); depth of bill at base, 6.60-7.11 (6.86); tarsus, 19.81-21.59 

 (20.57); middle toe, 13.72-15.24(14.22).' 



Adid.t female. —hQ^gih (skins), 140.72-150.88 (144.78); wing, 74.93- 

 83.82 (78.74); tail, 62.99-71.37 (66.55); exposed culmen, 10.41-11.68 

 (10.92); depth of bill at base, 6.60-6.86 (6.73); tarsus, 19.30-21.34 

 (20.57); middle toe, 13.21-15.24 (14.22).' 



Breeding in mountains of southern Wyoming (Fort Bridger, etc.), 

 Colorado (Summit, San Juan, and Costilla counties, etc.), Utah (Uintah 

 and Wahsatch mountains), Nevada (Toyabe Mountains) and northern 

 New Mexico (upper Pecos River); migrating in winter to surrounding 

 lowlands and southward to northeastern Sonora (Bavispe E.., Napolera, 

 etc.), northern Chihuahua, southern New Mexico, etc., casually to 

 southern California (Pasadena, Los Angeles County); accidental east- 

 ward to Michigan (Locke, Ingham County) ? 



StnUhxis caniceps Woodhouse, Proc. Ac. Nat. Sci. Phila., vi, Dec, 1852, 202 (San 

 Francisco Mt., Arizona; U. S. Nat. Mus.?); in Rep. Sitgreaves' Expl. Zuni 

 andCol.R.,1853, 83,pl. 3. 



.Tunco caniceps Baied, Rep. Pacific R. R. Surv., ix, 1858, 468, 927, part; ed. 1860 

 ("Birds N. Am."), atlas, pi. 72, fig. 1; Cat. N. Am. Birds, 1859, no. 353; in 

 Cooper's Orn. Cal., i, 1870, 201, part (includes /. dorsalis). — Codes, Proc. 

 Ac. Nat. Sci. Phila., 1866, 85 (Fort Whipple, Arizona, winter; crit. ). — 

 Allen, Bull. Mus. Comp. Zool., iii, 1872, 177 (mountains of Colorado, 7,500 

 ft. to timber line); Bull. Nutt. Orn. Club, iv, 1879, 123 (Locke, Ingham Co., 

 Michigan, 1 spec. Oct. 22, 1878). — Baied, Brewer, and Ridgway, Hist. N. 



' Eight specimens. 



