270 



U. S. p. R. K. EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



lAst of specimens. 



^Length. 6.25 ; Extent, 8.12. 



^Length, 5.12 ; Extent, 7.75. Iris, bill, and feet brown. 



DENDKOICA NIGKESCENS, Baird. 

 Black-throated Gray Warbler. 



Sylvia nigrescens, Townsend, J. A. N. Sc. Ph. VII, ii, 1837, 191. -Ib. Narrative, 1839, 341. — Acn. Orn. Biog. V, 



1839, 57; pi. 395. 

 Vermivora nigrescens, Bonap. List, 1838. — Nottall, Man. 1, 2d ed. 1840, 471. 



Sylvicola nigrescens, Aqn. Syn. 1839, 60.— Ib. Birds Araer. II, 1841, 62 ; pi. 94.— Bonap. Consp. 1850, 308. 

 lihimanphus nigrescens. Cab. Mus. Hein. 1850, 20. 



Sp. Ch. — Head all round, fore part of the breast, and streaks on the side of the body black ; rest of under parts, a stripe on 

 the side of the head, beginning acutely just above the middle of the eye, and another parallel to it, beginning at the base of the 

 under jaw (the stripes of opposite sides confluent on the chin,) and running further back, white. A yellow spol in front of the 

 eye. Rest of upper parts bluish gray. The interscapular region and upper tail coverts streaked with black. Wing coverts 

 black, with two narrow white bands ; quills and tail feathers brown, the two outer of the latter white, with the shafts and a 

 terminal streak brown ; the third brown, with a terminal narrow white streak. Bill black ; feet brown. Length, 4.70 ; 

 wing, 2.30; tail, 2.10. 



Bab. — Pacific coast. United States ; Fort Thorn, New Mexico. 



Winter specimens Lave the black of the crown obscured by gray ; that of the throat by white. 

 A specimen, supposed to be a female, is smaller, but somewhat similar to this ; the chin and 

 throat white, with slight indications of black ; more of this on the side of the breast. 



This species scarcely needs comparison with any other North American one, except, perhaps, 

 D. striata, which, however, is entirely distinct ; lacking the black throat, the two white stripes 

 on the side of the head, the yellow spot in front of the eye, &c. 



List of specimens. 



