314 REVIEW OF AMERICAN BIRDS. [PART I 
Synopsis of Species. 
Chin, throat, and breast nearly uniform mouse gray. 
Above uniform smoky brown. Under parts white, except 
as described. Crissum white, not banded . ; . serripennis, 
Chin and throat reddish fulvous, in strong contrast with gray of 
breast and sides. Belly tinged with sulphur yellow. Crissum 
white. 
Above uniform brown, or with rump gradually paler, but 
not contrasted with back. 
Crissum banded at end with blackish ; sulphur yel- 
low of belly well marked - : : . ruficollis. 
Crissum plain white; belly scarcely yellow . . fulvipennis. 
Above brown; the rump appreciably and abruptly paler 
(light gray). 
Crissum banded at end with black 2 - - uropygialis 
Crissum plain white(?). Color much darker and 
size smaller than preceding . - : - gutturalis. 
Stelgidopteryx serripennis. 
Hirundo serripennis, AupD. Orn. Biog. IV, 1858, 593.—Is. B. Am. I, 1840, 
198, pl. 51.—Cotyle s. Bon. Consp. 1850, 342.—Cassin.—BREWER, 
N. Am. Ool. I, 1857, 106, pl. iv, fig. 50 (eggs).—Barrp, Birds N. 
Am. 1858, 313.—Lorp, Pr. R. A. Inst. IV, 1864, 116 (Br. Columbia). 
—Coorrr & Sucktey, P. R. R. Rep. XII, u, 186 (W. Terr. )—HEER- 
maNN, P. R. R. X; Williamson’s Rep. 36 (San Antonio, Tex. ; 
breeding).—Stelgidopteryx s. Batrp, Birds N. Am. 1858, 312. 
Hab. Whole United States (exclusive of N. E. States ?), south to Central 
Mexico. 
(No. 32,269, %.) Above smoky brown, rather deeper on the head, perhaps 
a little paler on the rump. Larger quills and tail feathers dusky brown ; the 
secondaries and greater coverts sometimes lighter along their external edges. 
The under parts (for about half the total length) from bill-to and including 
breast, with the sides of body and lining of wings, mouse gray, rather lighter 
along the throat; the rest of under parts, including crissum, white, the latter 
with the shafts sometimes dusky, and very rarely with dusky blotches at the 
ends of the longer feathers. 
Young birds (as 1,120) differ in a tinge of reddish. fulvous on the upper 
parts ; the wing coverts, secondaries, and inner primaries margined more or 
less broadly with a brighter shade of the same. The gray of the under parts 
is also washed with this color, especially on the chin and across the breast. 
The hooks of the edge of the wing have not yet become developed. ; 
(No. 32,269, 4, fresh specimen before being skinned.) Total length, 5.40; 
expanse of wings, 12.20; wing from carpal joint, 4.50. e 
(No. 32,269, 4, prepared specimen.) Total length, 5.20; wing, 4.50; tail, 
