YELLOW-BELLIED FLYCATCHER. 
225 
Yellow-bellied Flycatcher, Tyrannula flaviventris , Baird. 
5 inches 4 lines, 8 inches 8 lines. 
Pennsylvania. Probably found in the Allegheny Mountains and Middle 
Districts. 
Male. 
“ Body rather stout. Bill broad and the sides convex. Tarsus longer 
than the middle toe. Wings rounded ; third primary longest, fourth slightly 
shorter, second one line shorter than the third and two lines longer than 
the fifth, first shorter than the fifth, but longer than the sixth. Tail emar- 
ginate and slightly rounded. 
“ Bill above dark blackish-brown, beneath light yellowish-brown. Feet 
brownish-black. Plumage of the upper parts deep greenish-olive, crown 
of the head rather darker, the feathers having their centres dark brown. A 
narrow ring around the eye pale yellow. Lower tail coverts, abdomen, and 
linings of the wings, bright sulphur-yellow, deepest on the abdomen. Sides 
of the body, fore part of the breast, and sides of the neck, olive, lighter than 
the back, and inclining to yellowish on the throat. Primaries and tail 
feathers dark brown, the former bordered with greyish, and the latter with 
olive, like the back. The lower row of lesser wing coverts, and the 
secondary coverts darker, tipped with pale yellow, that colour forming two 
bands across the wing. Secondaries darker than the primaries, and edged 
with pale yellow. 
“ Length 5 inches 4 lines ; extent 8 inches 8 lines ; folded wing 2 inches 
9 lines. 
“ The sexes are similar in colour, but the female is generally rather smaller. 
“ Observations. This strongly marked species will at once be distin- 
guished from every other by the deep yellow of its under parts. It 
resembles T. acadica of Gmelin ( querula of Wilson) somewhat in form, 
but acadica by comparison will be found to be a larger bird, lighter olive 
above, and very pale, yellow beneath. The tail of acadica is even or slightly 
rounded, in this species emarginate. 
“We have no specimen of T. pusilla of Swainson, but upon comparison 
with the description in Swainson and Richardson’s 1 Zoology of North 
America,’ (so favourably known for accuracy.) it appears to differ in the 
colour of the upper parts, pusilla being ‘ intermediate between hair-brown 
and oil-green our species is of a decided olive green ; the front of pusllia 
is 1 hoary in our species dark brownish-olive ; the bands on the wing 
greyish-white ; in our species pale yellow ; ‘ throat and breast ’ of T. pusilla 
‘ pale ash-grey in this species the throat is yellow, and the breast olive 
tinged with yellow.’' 
Vol. VIII.— 29 
