274 Descriptions of two New Birds, of the genus Tyrannula. 



Tyrannula flaviventris, (nob.) 



Specific characters. — Above deep greenish olive, beneath bright 

 sulphur yellow, sides and fore part of breast olivaceous. Tail 

 emarginate. Third and fourth primaries longest. Bill brownish 

 yellow beneath. 



Description of a Male. 



Form, fyc. — Body rather stout. Bill broad and the sides con- 

 vex. Tarsus longer than the middle toe. Wings rounded ; third 

 primary longest, fourth slightly shorter, second one line shorter 

 than third, and two lines longer than fifth, first shorter than fifth, 

 but longer than sixth. Tail emarginate and slightly rounded. 



Color. — Bill above dark blackish brown, beneath light yellow- 

 ish 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 round 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 

 grayish, 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 color forming two bands across the wing. 

 Secondaries darker than the primaries, and edged with pale yel- 

 low. 



Length 5 inches 4 lines ; extent 8 inches 8 lines ; folded wing 

 2 inches 9 lines. 



The sexes are similar in color, but the female is generally 

 rather smaller. 



Observations. — This strongly marked species will at once be 

 distinguished 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 favorably known for accuracy,) 



