13 
SIBERIAN CHIFF-CHAFF. 
Phylloscopus tristis, Dresser, Birds of Hurope, vol. ii, pp. 477-483 (1875). 
DESCRIPTION OF THE PLUMAGE. 
Adult Male in Spring.—The upper parts are olive brown, 
slightly more greenish and rather lighter on the rump. The 
wines are brown, the secondaries being broadly edged with the 
same colour as the back, only, slightly more greenish. The 
secondaries, greater coverts, primaries and their coverts are 
narrowly edged with light brown, whereas the median and 
lesser coverts are olive brown and the bastard wing dark 
brown. ‘The tail-feathers are brown edged with the same 
colour as the back. There is a light superciliary stripe, the 
lores are brownish buff, and the sides of the head light olive 
brown. The under parts are whitish, washed with buff on the 
crop and the sides of the breast. The under tail-coverts are 
whitish buff and the under side of the tail greyish lavender, 
the shafts of the feathers being white. The under parts of the 
wings are light brownish erey, and the axillaries and under 
wing-coverts bright lemon yellow. ‘The bill is horn brown, the 
base of the lower mandible being brownish pink. Iris is dark 
brown, and the feet blackish brown. 
The female resembles the male, the young being somewhat 
duller. 
