1 88 VERTEBRATES: BIRDS. 



are heard throughout the day among the taller trees. 

 The nest is generally suspended from forked twigs ; eggs 

 four to six, spotted with reddish brown at the larger end. 

 The Yellow-green Vireo, V. flavoviridis, Cass., of North- 

 ern Mexico and southward, closely resembles the preced- 

 ing, but the colors are more strongly marked. 



Bartram's Vireo, V. virescens, Vieill., of Central and 

 South America and possibly of the Atlantic United 

 States, resembles V. olivaceiis, but is smaller. 



The Whip Tom Kelly, V. altiloquus, Gray, of Florida 

 and the West Indies, is very similar to V. olivaceus. 



Fi s- ' ^ The Warbling Flycatcher or 



Vireo, V.gilvus, Bonap., of North 

 America, is about five and a half 

 inches long, the wing about three 

 inches ; the color olive green 

 above, beneath white, tinged with 

 very pale yellow on the breast 



Warbling Flycatcher, and sides. ItS SOng is low, mel- 



V. eil-vus, Bonap. 1 -, 



low, and sweet. 



The Philadelphia Vireo, V. philadelphicus, Cass., of 

 Pennsylvania to Wisconsin, closely resembles the pre- 

 ceding one, but is at once distinguished by the absence 

 of the spurious primary. 



Bell's Vireo, V. Belli, Aud., of Missouri River and Texas, 

 is four and a quarter inches long, the wing two and a 

 quarter inches, and is very similar to V. gilvus, but 

 smaller, and the spurious primary is large. 



The Black-headed Flycatcher, V. atricapilliis, Woodh., 

 of Texas, is four and three quarters inches long, the wing 

 over two inches ; olive green above, white beneath, the 

 head and neck above and on the sides black. 



The White-eyed Vireo, V. noveboracensis, Bonap., of 

 North America east of the Missouri, is five inches long, 

 the wing two and a half inches, the spurious primary 



