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. 



Tliryotliorus toewickii, var. toevvickii. 



Troglodytes bewickii, Aud. Orn. Biog. I, 1831, 96, pi. xviii. — Ib. B. A. 

 II, 1841, 120, pi. lis.— Thryothorus bewickii, Bonap. List, 1838.— 

 Baird, Birds N. Am. 1858, 363. — Telmatodytes bewickii, Cab. Mus. 

 Hein. I, 1850, 78. 

 Hab. Eastern province of" United States. 



Locality. 



Carlisle, Pa. 

 Liberty Co., Ga. 

 Macou, Ga. 



When 

 Collected. 



April 30, '46. 

 Oct. 1848. 



Received from 



S. F. Baird. 

 Prof. Leconte. 



Collected by 



Tliryotliorus Ije^vicltii, var. spilurus. 



Troglodytes spilurus, Vir.oKS, Zool. Beechey's Voyage, 1839, 18, pi. iv, 

 fig. 1 (California). 



' Thryo7n>ines, SchATER, Catal. Am. Birds, 1861, 22. (Type Troglodytes 

 bewickii, var. spilurus.') 



