574 NORTH AMERICAN BIRDS. 



mud. Eggs 2-5, 1.04 X -72, plain greenish blue. Hdb. Eastern 

 United States, in summer, north to southern Michigan, Ontario, 

 Massachusetts, etc. ; south, in winter, to Guatemala and Cuba. 



755. T. mustelinus Gmel. Wood Thrush, 

 6 s . Sides grayish or brownish, without distinct spots ; chest more or less tinged 

 with buff, and marked with triangular darker spots; exposed culmen 

 not more than .60. 

 c 1 . Second quill much longer than fifth, the second or third longest; tail 

 and its upper coverts not noticeably different in color from other 

 upper parts (except sometimes in T. ustulatus). 

 d l . No distinct lighter orbital ring. 



e 1 . Above tawny brownish, the chest buffy or light ochraceous, 

 marked with small wedge-shaped spots or streaks of brown. 

 West on or near ground, without mud in its composition. 

 Eggs plain greenish blue (very rarely with a few small 

 specks of brown). 

 f\ Above light tawny brown ; chest creamy buff, with nar- 

 row markings of brown, scarcely darker than upper 

 parts; length 6.45-7.75, wing 3.75-4.15 (3.90), tail 

 2.70-3.30 (2.96), culmen .52-.60 (.55), tarsus 1.05-1.25 

 (1.15). Eggs .85 X -67. Sab. Eastern United States 

 and British Provinces, breeding from about 40° north 

 to Manitoba, Ontario, Anticosti, and Newfoundland. 



756. T. fuscescens Steph. Wilson's Thrush. 

 f- Above russet-olive; chest very pale buff, with broader 



markings of darker brown ; length about 6.90-7.90, 

 wing 3.80-4.25 (4.02), tail 2.95-3.40 (3.20), culmen .55- 

 .60 (.57), tarsus 1.15-1.28 (1.17). Eggs .85 X -66. Hob. 

 Eocky Mountains, east, casually (?), during migrations, 



to Minnesota, Illinois, etc 756a. T. fuscescens 



salicicolus (Eidgw.). Willow Thrush. 



e 2 . Above olive-brown or grayish olive, the sides of the head 



nearly uniform grayish ; chest pale buffy (sometimes 



nearly white), marked with large triangular spots of 



dusky. Nest in low bushes or on ground, composed of 



mosses, etc., bulky and compact. Eggs greenish blue, 



spotted with rusty brown. 



f\ Length about 7.00-7.75, wing 3.75-4.40 (4.07), tail 2.95- 



3.40 (3.09), culmen .45-.58 (.55), tarsus 1.12-1.30 (1.18). 



Eggs .92 X -67. Hab. Northern North America east 



of Eocky Mountains, breeding from Labrador and 



west side of Hudson's Bay north to Arctic coast and 



coast of Bering's Sea; in winter, Middle America, 



south to Costa Eica ; eastern Siberia. 



757. T. aliciae Baird. Gray-cheeked Thrush. 



