r)5<S HULLPJTIN 50, UNITED STATES NATIONAL MUSEUM. 



Adtdt fenwJe.—hi^ngih (skin.s), 107-122 (111.9); wing, 54.2-62.8 

 (5'J.l); tail, 47-51 (4S.<»); exposed culmen, 8.4-9.6 (9.1); tarsus, 

 16.6-17.6 (17.3); middle toe, 9.6-10.8 (10.1).^ 



AVestern United States, north to Colorado (El Paso County; Fort 

 Garland), Utah (U^nitah Mountains). Nevada (East Humboldt Moun- 

 tains), and Vancouver Island; breeding southward to southern Cal- 

 ifornia (mountains of Los Angeles and San Bernardino counties), 

 Lower California (San Pedro Martir Mountains), and southern Ari- 

 zona (Santa Catalina and Santa Rita mountains); in winter southward 

 through Mexico t(^ States of Oaxaca and Vera Cruz. 



Sylvia nigrcHccns Townsend, Journ. Ac. Nat. Sci. Phila., vii, 1837, 191 ("forests 

 of the Columbia River;" type now in coll. U. S. Nat. Mus.); Narrative, 

 1839, 341.— Audubon, Orn. Biog., v, 1839, 57, pi. 395; Synopsis, 1839, 60. 



Vermivora nigrescens Bonaparte, Geog. and Comp. List, 1838, 21. — Nuttall, 

 Man. Orii. U. S. and Can., 2d ed., i, 1840, 471. 



S)/lricola nigreiiceyis Audubon, Birds Am., oct. ed., ii, 1841, 62, pi. 94. — Duces, 

 La Naturaleza, i, 1869, 141 (Guanajnato, Mexico). 



ISi/liy'K'ola'] nigrescens Bonaparte, Consp. Av., i, 1850, 308. 



}f[)ii(iliha'] nigrescens GiiAY, Gen. Birds, i, 1848, 196. 



[Mtilotilta] nigrescetw Gray, Hand-list, i, 1869, 240, no. 3470. 



R\Jiimanphus] nigrescens Cabanis, Mas. Hein., i, 1850, 20 (Mexico). 



Dendroica nigrescens Bairt), Rep. Pacific R. R. Surv., ix, 1858, 270; Cat. N. Am. 

 Birds, 1859, no. 192; Review Am. Birds, 1865, 186.— Sci,ater, Proc. Zool. 

 Soc. Lond., 1858, 298 (La Parada, Oaxaca); 1859, 374 (Oaxaca, Mar.).— 

 Henry, Proc. Ac. Nat. Sci. Phila., xi, 1859, 106 (New Mexico).— Heer- 

 MANN, Rep. Pacific R. R. Surv., x, 1859, 40 (localities in California). — 

 Xantus, Proc. Ac. Nat. Sci. Phila., 1859, 191 (Fort Tejon, California.— 

 Cooper and Suckley, Rep. Pacific R. R. Surv., xii, pt. ii, 1860, 180 (Puget 

 Sound and Fort Steilacoom, Washington). — Sumichrast, Mem. Bost. Soc. 

 N. H., i, 1869, 547 (Orizaba, Vera Cruz, winter). — Aiken, Proc. Bost. Soc. 

 N. H., XV, 1872, 197 (El Paso Co., Colorado) .—Ridgway, Bull. Essex Inst., 

 V, 1873, 180 (Colorado); vii, 1875, 20 (e. Humboldt Mts., Nevada, breeding), 

 32 (Wahsatch Mts., Utah, breeding). — Baird, Brewer, and Ridgway, Hist. 

 N. Am. Birds, i, 1874, 258, pi. 12, fig. 8; iii, 1874, 506 (El Paso Co., Colo- 

 rado).— Henshaw, Rep. Orn. Spec. Wheeler's Surv., 1873 (1874), 75 (Fort 

 Garland, Colorado, June 25), 103 (Apache and White Mts., Arizona, Aug., 

 Sept.); Zool. Exp. W. 100th Merid., 1875, 198 (Santa Fe, New Mexico, Aug. 



^ Eight specimens. 



Specimens from the Pacific coast tlistrict average slightly smaller than those from 

 the Rocky Mountain plateau, averages of two series being as follows: 



