558 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult female.— \^&ug\hi (skins), 107-122 (111.9); wing, 54.2-62.8 

 (5y.l); tail, 47-51 (48.9); exposed culmen, 8.4-9.6 (9.1); tarsus, 

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



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

 Garland), Utah (Unitah 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 to States of Oaxaca and Vera Cruz. 



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

 of the Columbia Eiver;" type now in coll. TJ. 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. Om. U. S. and Can., 2d ed., i, 1840, 471. 



,Si/lricola nigrescens Audubon, Birds Am., oct. ed., ii, 1841, 62, pi. 94. — Dnofe, 

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



[Sylvicola] nigrescens Bonaparte, Consp. Av., 1, 1850, 308. 



M[niotilta] nigrescens Gjiay , Gen. Birds, i, 1848, 196. 



[Mniotilta] nigrescens Gray, Hand-list, i, 1869, 240, no. 3470. 



R[kimanphiis'] nigrescens Cabanis, Mus. Hein., i, 1850, 20 (Mexico). 



Dendroica nigrescens Baird, Rep. Pacific E. E. Surv., ix, 1858, 270; Cat. N. Am. 

 Birds, 1859, no. 192; Eeview Am. Birds, 1865, 186.— Solatee, Proc. Zool. 

 Soc. Lond., 1858, 298 (La Parada, Oaxaca); 1859, 874 (Oaxaca, Mar.).— 

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

 MANN, Eep. Pacific E. E. Surv., x, 1859, 40 (localities in California).— 

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

 Cooper and Suckley, Eep. Pacific E. E. Surv., xii, pt. ii, 1860, 180 (Puget 

 Sound and Fort Steilacoom, Washington). — Sumicheast, Mem. Best. Soc. 

 N. H., i, 1869, 547 (Orizaba, Vera Cruz, winter). — Aiken, Proc. Best. 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, Brewbe, and Eidgway, Hist. 

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

 rado).— Henshaw, Eep. 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 district average slightly smaller than those from 

 the Eocky Mountain plateau, averages of two series being as follows r 



