. Perching Birds Chiefly Brown or Streaked. 
757. Gray-cheeked Thrush (Hylocichla alicie). L. 
7-5; W. 4. Ads. Tail and back the same color, olive 
without brownish tinge; eye-ring and lores whitish, 
cheeks and breast only sightly tinged with buff, breast 
with wedge-shaped spots. Notes. Doubtless like 
those of No. 7574. 
Radge.—Breeds In Labrador and west to Alaska; migrates through 
eastern North America and winters in Central America. 
757a. Bicknell Thrush (H. a. bicknell*), Similar 
to No. 757, but smaller, L. 7; W. 3.5. Notes. Calls, 
pheu like that of Veery; a low cluck like that of Hermit 
Thrush, and rarely, a pip or peenk like that of Olive- 
backed Thrush; song, like that of Veery but more in- 
terrupted. (Brewster.) 
Range.—-Breeds in the high parts of the Catskillls and north to 
White Mountains and Nova Scotia; winters in tropics. 
758. Russet-backed Thrush (Hylocichia ustulata). 
L. 7.2; W.4. Tail not decidedly more rufous than 
back. Ads. Eye-ring, cheeks, sides of neck and 
breast distinctly buffy; breast with wedge-shaped spots; 
back and flanks olive-brown; tail slighty browner. 
The most deeply colored bird of the ustulata group. 
Range.—Pacific coast; breeds from Oregon to Alaska; winters 
south to Guatemala, 
758a. Olive-backed Thrush (H. uw. swainsonzz). 
Similar to No. 758, but back, tail, and flanks without 
brownish or rufescent tinge. Notes. Call, a liquid 
put, song, suggesting both that of Hermit Thrush and 
the Veery. 
Range.—Eastern North America; breedsin Alleghanies from Penn- 
sylvania and the Catskills, north to New Brunswick and Manitoba; 
winters in Central and South America, 
758b. California Olive-backed Thrush (H. wu. 
edica). Differs from 758 and 758a, in more rufescent 
coloration on the flanks; sides and upper surface 
usually paler than No. 758. (Oberholser. ) 
Range.—Callfornia, except north coast; north in interior to southern 
eae south, in winter to Arizona and southern Mexico. (Ober- 
holser. 
758c. Alma Thrush (H. #. alme@). Similar to No. 
758a, but back and flanks grayer. The palest bird of 
the ustulata.group. 
Range.—Alaska, except Yukon Basin, south in Rocky Mountain 
region, and west to Utah and eastern Nevada. (A. O. U.) 
239 
