126 REVIEW OF AMERICAN BIRDS. [PART I. 
b. THRYOMANES.? 
There are three strongly marked geographical varieties, if not 
species of ‘ Bewick’s Wren,” separable by quite constant characters. 
Of these the Mexican (leucogaster) and the typical form from eastern 
North America (bewickii) differ most in coloration, while the western 
(spilurus) is intermediate in this respect, but with a longer bill than 
in the other two. The peculiarities of the three forms may be ex- 
pressed by the following diagnosis :— 
Var. bewickii.—Above dark rufous-brown; rump and middle tail feathers 
sometimes a little paler, and very slightly tinged with gray, and together 
with the exposed surface of secondaries distinctly barred with dusky. 
Beneath soiled plumbeous whitish; flanks brown. Crissum banded; 
ground color of quills and tail feathers brownish-black. 
Var. leucogaster.—Above ashy-brown; rump and middle tail feathers 
brownish-ash—the former nearly pure ash; without appreciable bars ; 
bars on secondaries obsolete. Beneath, including inside of wing, pure 
white, with little or no brownish on the sides. Crissum banded ; ground 
color of the quills and tail feathers grayish-brown. 
Var. spilurus.—Similar to bewickii in color, the bill considerably longer. 
Length from nostril, .50, gape, .81, instead of .39 and .70. 
Young birds from all the localities differ from adults merely in 
having the feathers of the throat and breast very narrowly and in- 
conspicuously edged with blackish. 
Thryothorus bewickii, var. bewickhii. 
Troglodytes bewickii, Aup. Orn. Biog. I, 1831, 96, pl. xviii.—Is. B. A. 
II, 1841, 120, pl. 118.—Thryothorus bewickii, Bonar. List, 1838.— 
Barrp, Birds N. Am. 1858, 363.— Telmatodytes bewickii, Cas. Mus. 
Hein. I, 1850, 78. 
Hab. Kastern province of United States. 
Smith- Collec-| Sex 
: : When * 
sonian| tor’s | aud Locality. Received from Collected b 
. | No. | Age. Collected. y 
25,262 fof Carlisle, Pa. April 30,’46. 8. fF: Baird: > 1s) lee 
11,722 Z Liberty Co., Ga. sine Prof. Geeonte: ~| "ie messes 
32,282 ele Macon, Ga. Oct. 1848. Bs: SAP eee ets 
Thryothorus bewickii, var. spilurus. 
Troglodytes spilurus, Vicors, Zool. Beechey’s Voyage, 1839, 18, pl. iv, 
fig. 1 (California). 
1 Thryomanes, Scuater, Catal. Am. \Birds, 1861, 22. (Type Zroglodytes 
bewickti, var. spilurus.) 
