TRAILL’S FLYCATCHER. 
EMPIDONAX PUSILLUS TRAILLII. 
Cuar. Upper parts olive brown, darker on the head, lighter on the 
rump ; under parts whitish, the sides tinged with pale olive, which ex- 
tends nearly across the breast, the belly tinged with yellow; wings dusky, 
with yellowish white bars. Length 5% to 6 inches. 
est. Onan upright fork in a clump of alders or low deciduous tree, 
1 to 8 feet from the ground; composed of grass roots or hempen fibre, 
lined usually with fine grass, sometimes with horse-hair or thistle-down. 
Leggs. 3-4; creamy white or buff, boldly spotted with light and dark 
brown chiefly about the larger end; 0.70 X 0.53. 
This species, so nearly allied to the last, was first distin- 
guished by Audubon. Its note resembles the syllable ‘whee?, 
’wheet, articulated clearly while in the act of flying. It was 
first observed on the wooded skirts of the prairies along the 
banks of the Arkansas. Mr. Townsend and myself observed it 
in various places in the skirts of the forests of the Columbia 
and Wahlamet during the summer, when it was breeding, but 
we could not discover the nest. Its motions are thus de- 
scribed by Audubon: “When leaving the top branches of a 
low tree this bird takes long flights, skimming in zig-zag lines, 
passing close over the tops of the tall grasses, snapping at and 
seizing different species of winged insects, and returning to the 
same trees to alight.” 
Traill’s Flycatcher is chiefly a spring and autumn migrant 
through southern New England, though a few pairs breed as far 
