316 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



(9.65); depth of bill at base, 5.33-5.84(5.69); tarsus, 16.26-17.53 (17.02); 

 middle toe, 11.43-12.45 (12.19).^ 



Western North America in general, from the Rocky Mountains to 

 the Pacific coast, including Alaska and the more western parts of the 

 interior districts of British America;" breeding from the southern 

 border of the United States (perhaps also in northern Mexico), chiefly 

 in mountains, northward to the Yukon Valley, Alaska, and from the 

 Pacific coast eastward to western Texas, eastern New Mexico and 

 Colorado, western Manitoba, etc. ; in winter south over Mexican Pla- 

 teau to States of Vera Cruz (Jalapa, Las Vigas, Chalchicomula, etc.) 

 and Puebla, to the extremity of Lower California, and, casually, to 

 Guadalupe Island. 



Spizella socUdis (not Fringilla sodaZis Wilson) Newberry, Rep. Pacific R. R. Surv., 

 vi, pt. iv, 1857, 88 (Sacramento Valley, California). — Baied, Rep. Pacific 

 R. R. Surv., ix, 1858, 473, part (western localities); Cat. N. Am. Birds, 1859, 

 no. 359, part; Rep. Ives' Ool. Exp., 1857-58, pt. iv, 1861, 6.— Heermann, 

 Rep. Pacific R. R. Surv., x, pt. iv, 1859, 48 (California, etc.).— Sclater, 

 •Proc. Zool. Soc. Lond., 1859, 235 (Vancouver I.). — Xantus, Proc. Ac. Nat. 

 Sci. Phila., 1859, 192 (Fort Tejon, California).— Henry, Proc. Ac. Nat. Sei. 

 Phila., 1859, 107 (New Mexico). — Cooper and Suckley, Rep. Pacific R. R. 

 Surv., xii, pt. ii, 1860, 203 (Washington).— CouES, Ibis, 1865, 159, in text 

 (Arizona); Proc. Ac. Nat. Sci. Phila., 1866, 87 (Fort Whipple, Arizona, 

 Mar. to Nov.; crit.); 1868, 83 (Arizona); Bull. U. S. Geol. and Geog. Surv. 

 Terr., iv, 1878, 590 (Rocky Mts., lat. 49°).— Dresser, Ibis, 1865, 489 (near 

 San Antonio, Texas). — Brown, Ibis, 1868, 422 (Vancouver I.). — Cooper, 

 Orn. Cal., 1870, 207.— Allen; Bull. Mus. Comp. Zool., iii, 1872,- 157, 177 

 (South Park, Dakota, etc.); Proc. Bost. Soc. N. H., 1874, 45, 57 (Upper 

 Missouri and Yellowstone rivers, Montana). — Aiken, Proc. Bost. Soc. N. H., 

 1872, 200 (Colorado).— Merriam, Ann. Rep. U. S. Geol. Surv. Terr., 1872 



^Fourteen specimens. 



Specimens from the Pacific coast district (southern California to British Columbia) 

 average decidedly smaller than those from the Rocky Mountain district, but in the 

 absence of any obvious color differences I hesitate to separate them. Averages of 

 two series are as follows: 



^ Owing to insufficiency of material, especially breeding birds, from the middle 

 portions of the continent, it is not practicable at present to define exactly the eastern 

 limits of this form, nor the western limits of S. s. socialis. 



