574 NORTH AMERICAN BIRDS. 
mud. Eggs 2-5, 1.04 >< .72, plain greenish blue. Had. Eastern 
United States, in summer, north to southern Michigan, Ontario, 
Massachusetts, etc.; south, in winter, to Guatemala and Cuba. 
755. T. mustelinus Guzx. Wood Thrush. 
b, 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. 
ce. 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 7’. ustulatus). 
d'. No distinct lighter orbital ring. 
é. Above tawny brownish, the chest buffy or light ochraceous, 
marked with small wedge-shaped spots or streaks of brown. 
Nest on or near ground, without mud in its composition. 
ggs plain greenish blue (very rarely with a few small 
specks of brown). 
fi. 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. Hab. astern United States 
and British Provinces, breeding from about 40° north 
to Manitoba, Ontario, Anticosti, and Newfoundland. 
756. T. fuscescens Step. 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 & .66. Hab. 
Rocky Mountains, east, casually (?), during migrations, 
to Minnesota, Tllinois, etc......... 756a. T. fuscescens 
salicicolus (Rivew.). Willow Thrush. 
e*, 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 Rocky 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 Rica; eastern Siberia. 
757. T. alicize Barrp. Gray-cheeked Thrush. 
