470 
U. S P. R. R, EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 
POOSPIZA BILINEATA, Sclater. 
Black-throated Sparrow. 
Emberiza bilineata, Cassin, Pr. A. N. Se. Ph. V, Oct. 1850, 104, pi. iii, Texas.— Ib. Must. I, v, 1854, 150 ; pi xxiii. 
Poospiza bilineata, Sclater, Pr. Zool. Soc. 1857, 7. 
Sp Ch. — Above uniform unspotted ashy gray, tinged with light brown ; purer and more plumbeous anteriorly. Under parts 
white, tinged with plumbeous on the sides, and with yellowish brown about the thighs. A sharply defined superciliary and 
maxillary stripe of pure white, the former margined internally with black. Loral region black, passing insensibly into dark 
slate on the ears. Chin and throat between the white maxillary stripes black, ending on the upper part of the breast in a 
rounded outline Tail black, edged externally with white. Bill blue. Length, 5.40 ; wing, 2.75 ; tail, 2.90. 
Hab. — Valley of Rio Grande and of Gila. (As far west as Janos and the Mohave villages.) 
This species in external form is very similar to P. belli, and will probably fall in the same 
genus. The cutting edges of the bill are much inflexecl. The first quill is shorter than the 
sixth. The tail is a good deal rounded ; the feathers broad. 
The white maxillary stripe does not come quite to the base of the under jaw, which there is 
black. There is a hoary tinge on the forehead. The white superciliary stripes almost meet on 
the forehead. 
In the immature bird the throat is white, the upper part of the breast streaked with brown. 
List of specimens. 
Catal . 
No. 
4U88 
6320 
Sex and 
age. 
9 
Locality. 
When col- 
lected 
Whence obtained. 
Orig'l 
No. 
Collected by— 
Length. 
Stretch 
ot'willgs. 
7.50 
Wing. 
Remarks. 
Tamaulipas, Mexico. . , . 
Ringgold Barracks, Tex. 
Mar. — , 1853 
July —,1853 
Lieut. Couch . . . 
77 
J. H. Clark .... 
J. H. Clark.... 
Dr. Heermann . 
5.25 
2.50 
Eyes dark brown ; bill 
black ; feet lead color. 
& 
Lieut. J. G. Parke 
do 
6317 
6318 
6319 
6323 
632-1 
6315 
Major Emory 
■T 
o 
May 5, 1852 
do 
5.12 
5. 00 
8.00 
7.62 
2.75 
2.50 
An 
Lieut. J. G. Parke 
Dr. Heermann. 
3 
3 
dn 
El Pa^o, N. M 
Boca Grande, N. M 
Dec. — , 1854 
Mar. — , 1855 
Major Emory 
do 
17 
42 
J. H. Clark .... 
5.50 
8.00 
2.50 
Eyes black. (?) 
POOSPIZA BELLI, Sclater. 
Bell's Finch. 
Emberiza belli, Cassin, Pr. A. N. Sc. Phila. V, Oct. 1850, 104 ; pi. iv. San Diego, Cal, 
Poospiza belli, Sclater, Pr. Zool. Soc. 1857, 7. 
Sp. Ch. — Upper parts generally, with sides of head and neck, uniform bluish ash, tinged with yellowish gray on the crown 
and back, and with a few obsolete dusky streaks on the interscapular region. Beneath pure white, tinged with yellowish brown 
on the sides and under the tail. Eyelids, short streak from the bill to above the eye, and small median spot at the base of bill, 
white. A stripe on the sides of the throat and spot on the upper part of the breast, with the loral space and region round the 
eyes, plumbeous black. Tail feathers black ; the outer edged with white. Wing feathers all broadly edged with brownish 
yellow ; the elbow joint tinged with yellowish green. Bill and feet blue. Length, 6.25 ; wing, 2.90. 
Hab. — Southern California and valley of Gila and Colorado to Fort Thorn. 
This remarkable sparrow needs comparison with no other known North American species for 
its identification. The tail is very long and considerably emarginated, and the outer feather 
