JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 667 



327a. Seiurus noveboracensis notabilis (Rioow.). 

 GRINNELL'S WATER-THRUSH. 



Distr.: Western United States, east to Illinois and Mississippi 

 Valley and casual to the Atlantic coast ; breeds chiefly from northern 

 Minnesota and western Nebraska northward to the Mackenzie region 

 and Alaska; in winter from southern border of United States to 

 Central America, the West Indies and northern South America. 



Grinnell's Water-thrush differs from the eastern bird, 5. nove- 

 boracensis, in being larger and having the upper parts darker, more 

 grayish olive than brownish olive, and the superciliary stripe and 

 under parts decidedly whiter. 



Wing, 2.90 to 3.20; bill, .45 to .55 inches. 



An abundant migrant in Illinois and Wisconsin in spring and fall. 

 While numerous intermediates occur, typical examples are not un- 

 common. Prof. Ridgway says: "Examples collected by me in Rich- 

 land and Wabash Counties, Illinois, and in Knox County, Indiana 

 (near Wheatland), are very typical of this race." (Orn. 111., 1889, 

 p. 163.) 



According to Kumlien and Hollister, it is a regular migrant, even 

 in the southeastern part of the state. They say: "Specimens of this 

 race were identified by Mr. William Brewster among the water- 

 thrushes sent for his inspection." (Birds of Wisconsin, 1903, p. 117.) 



328. Seiurus motacilla (VIEILL.). 

 LOUISIANA WATER-THRUSH. 



Distr.: Eastern United States and southern Canada, west to 

 Iowa, eastern Kansas and eastern Texas, north to southern New 

 England and southern Michigan, southern Wisconsin and southern 

 Minnesota; breeds throughout its United States range, except south- 

 ern Florida ; winters from southern border of United States southward 

 to the Greater Antilles, Mexico, and Central America to northern 

 South America. 



Adult: Resembles somewhat 5. noveboracensis, but bill larger and 

 the pale yellow of the under parts replaced by white, shading into 

 pale buff on the flanks, abdomen, and under tail coverts; superciliary 

 line, white. 



Sexes similar. 



Length, 6.15; wing, 3.15; tail, 2.25; bill, .55. 



The Louisiana Water-thrush is a common summer resident in 

 southern Illinois, and of casual occurrence in parts of northern Illinois 



