342 YELLOW-BELLIED FLYCATCHER. 



Yellow-bellied Flycatcher, Tyrannulajlaviventris, Baird. 



5 inches 4 lines, S 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 "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 pusilla 

 is "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." 



