BLACK-THROATED GREEN WARBLER. 270 



a line of white extends over the eye ; the rose colour also 

 reaches to the base of the bill, where it is speckled with 

 black and white. The female is of a light yellowish flaxen 

 colour, streaked with dark olive and whitish ; the breast is 

 streaked with olive, pale flaxen, and white ; the lining of the 

 wings is pale yellow ; the bill more dusky than in the male, 

 and the white on the wing less. 



BLACK-THROATED GEEEN WARBLER {Sylvia 

 virens.) 



- PLATE XVII.— Fig. 3. 



Motacilla virens, Gmel. Syst. i. p. 985. — Le Figuier a cravate noire, Buff. v. p. 

 298.— Black-throated Green Flycatcher, Edw. t. 300.— Green Warbler, Arct. 

 Zool. ii. No. 297.— Lath. Syn. iv. p. 484, 108.— Turton, Syst. p. 607.- 

 Parus viridis gutture nigro, the Green Black-throated Flycatcher, Bartram, 

 p. 292. 



SYLVICOLA VIBENS—SwAmson. 



Sylvia virens, Bonap. Synop. p. 80. 



This is one of those transient visitors that pass through 

 Pennsylvania in the latter part of April and beginning of 

 May, on their way to the north to breed. It generally fre- 

 quents the high branches and tops of trees in the woods, in 

 search of the larvae of insects that prey on the opening buds. 

 It has a few singular chirruping notes, and is very lively and 

 active. About the 10th of May it disappears. It is rarely 

 observed on its return in the fall, which may probably be 

 owing to the scarcity of its proper food at that season obliging 

 it to pass with greater haste ; or to the foliage, which prevents 

 it and other passengers from being so easily observed. Some 

 few of these birds, however, remain all summer in Pennsylvania, 

 having myself shot three this season (1809) in the month of 

 June ; but I have never yet seen their nest. 



This species is four inches and three-quarters long, and 

 seven broad ; the whole back, crown, and hind head is of a 

 rich yellowish green ; front, cheeks, sides of the breast, and 

 line over the eye, yellow ; chin and throat, black ; sides, 



