178 VERTEBRATES: BIRDS. 



over six inches long, and the wing over three inches, 

 the bill small, a superciliary stripe brownish yellow, the 

 under parts streaked with olivaceous brown, and the 

 breast almost black. 



The Large-billed Water-Thrush, 5. ludoviciamts, Bonap., 

 of the United States east of the Missouri, is six and one 

 third inches long, the wing three and a quarter inches ; 

 and distinguished by its large bill, and superciliary white 

 stripe. 



The Genus Deitdroica, formerly Sylvicola, has the bill 

 attenuated, depressed at the base, compressed from the 

 middle, bill distinctly notched, bristles short but distinct, 

 tarsi long, the hind claw long, the wings long and pointed, 

 the second quill usually a very little longer than the first, 

 tail slightly rounded, and always with a white spot. More 

 than twenty species belonging to this genus are found in 

 the United States. By adopting the synopsis of the spe- 

 cies as given by Baird, they may readily be defined. 



A. Those belonging to this group have the chin, throat, 

 and fore part of the breast black bordered by lighter, 

 the back streaked, two white bands upon the wing, and 

 the outer tail-feathers mainly white. 



The Black-throated Green Warbler, D. virens, Baird, 

 of the United States east of the Missouri, is five inches 

 long, the wing over two and a half inches, the crown and 

 back olive, the forehead, superciliary and maxillary stripes 

 yellow. 



The Western Warbler, D. occidentdlis, Baird, of the 

 Pacific coast, is four and seven tenths inches long, the 

 wing two and seven tenths inches, the top and sides of 

 the head yellow, the back ash conspicuously streaked. 



Townsend's Warbler, D. Townsendii, Baird, of the Pa- 

 cific coast, is five inches long, the wing two and six tenths 

 inches, the crown blackish, back olive, superciliary and 

 maxillary stripes yellow. 



