270 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
List of specimens. 
Catal. No. 
Sex. 
Locality. 
When collected. 
Whence obtained. 
Collected by— 
2918 
448(U 
44812 
492 
8017 
3 
Columbia river_ 
Oct. 28, 1835 . 
S. F. Baird._ 
J. K. Townsend._ 
Santa Clara, Cal_ 
1855. 
Dr. J. G. Cooper_ 
_do.. 
1855. 
North Mexico___ 
S. F. Baird. 
Guatemala_ 
J. Gould. 
^-Length. 5.25 ; Extent, 8.12. 2 Lengtk, 5.12 ; Extent, 7.75. Iris, bill, and feet brown. 
DENDROICA NIGRESCENS, Baird. 
Black-throated Gray Warbler. 
Sylvia nigrescens, Townsend, J. A. N. Sc. Ph. VII, ii, 1837, 191. ~Ib. Narrative, 1839, 341.— Add. Orn. Biog. V, 
1839, 57 ; pi. 395. 
Vermivora nigrescens, Bonap. List, 1838.—Nuttall, Man. I, 2d ed. 1840, 471. 
Sylvicola nigrescens, Add. Syn. 1839, 60.—Ib. Birds Amer. II, 1841, 62 ; pi. 94.—Bonap. Consp. 1850, 308. 
Rhimanphus 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 midd'e 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 spot 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. 
Hab .—Pacific coast, United States ; Fort Thorn, New Mexico. 
Winter specimens have the hlack of the crown obscured by gray ; that of the throat by white. 
A specimen, supposed to be a female, is smaller, hut 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 hlack throat, the two white stripes 
on the side of the head, the yellow spot in front of the eye, &c. 
List of specimens. 
Catal. 
No. 
Sex. 
Locality. 
When collected 
Whence obtained. 
Orig. 
No. 
Collected by— 
Length. 
Stretch 
of wings. 
Wing. 
7686 
May 6, 1856 
378 
7687 
.do __ 
_...do__ 
74 
7688 
_ _do_. ._ 
_do 
106 
7691 
May 4 1856 
5. 25 
7.12 
2.50 
1908 
S. F. Baird . ... 
J. K. Townsend. 
2915 
A 
May 14, 1835 
7690 
s 
R. S. Williamson. 
Dr. Newberry... 
7689 
Dr. Henry._ 
