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



dark, like the greater wing coverts, and broadly edged with yel- 

 lowish white. 



Length 5 inches 2 lines. Extent 8 inches 3 lines. Folded 

 wing 2£ inches. 



No perceptible difference as to color or size between the sexes. 



Observations. — This species will be recognized by its size, its 

 slender form making it the smallest of our North American Ty- 

 rannulge. In color it most resembles T. Traillii, of Audubon, 

 but it is a much smaller bird, being nearly three-fourths of an inch 

 shorter. T. Traillii has the breast and sides of the neck oliva- 

 ceous ; in this species light ash gray ; the tail also of T. Trail- 

 lii is even. 



It differs from T. pusilla (comparing with the description of 

 Swainson and Richardson as before) in having the wings more 

 pointed, the second and third primaries being longest, and the 

 first longer than the sixth ; while in pusilla the third and fourth 

 are longest, and the first shorter than the sixth. The upper tail 

 coverts of pusilla are uniform in color with the back ; in our spe- 

 cies lighter: pusilla has the front "hoary;" in this species dark. 

 The lower parts of pusilla are pale sulphur yellow, " approaching 

 to siskin-green ;" in our species yellowish white : the under man- 

 dible of pusilla is yellowish brown ; of this species horn color. 

 From the figure in the Fauna Boreali-Americana, pusilla appears 

 to be a stouter bird, much deeper in color beneath and having a 

 broader bill. Its smaller size and darker color above, will distin- 

 guish it from T. Acadica, (being two-thirds of an inch shorter,) 

 which species has also longer and more pointed wings, a much 

 larger bill which is light brown beneath, and an even tail. 



This species was first observed and procured in May, 1839, 

 near Carlisle, Penn. Since then numbers have been observed 

 and shot on every succeeding spring. Like the preceding, ( T. 

 fiaviventris,) this bird does not frequent deep forests, but is found 

 among the scattering trees which border our streams. It is rath- 

 er shyer than T. flaviventris, and does not, like that species, seek 

 dense thickets. It also, most probably, goes further north to 

 breed, as after the last of May it is no longer to be seen. It vis- 

 its us from the south in the latter part of April, generally making 

 its appearance about a week before T. flaviventris. 



