122 



REVIEW OF AMERICAN BIRDS. 



[part I. 



B- Tail feathers, except central, black ; 

 the exposed surface and tips only varied 

 with white. 



1. Bill and legs very stout, the former 

 longer than the head. Wings longer 

 than tail. A concealed nuchal half 

 collar of white streaks. 



Color much as in T. bewickii, but 

 whiter beneath. Outside of 

 wings very obsoletely banded petenicus, 



2. Bill and legs more slender ; some- 

 times the bill shorter than head. 

 Tail longer than the wings. No con- 

 cealed nuchal half collar. 



Above dark rufous brown ; be- 

 neath plumbeous white ; flanks 

 tinged with brown. Rumpand 

 exposed secondaries distinctly 

 banded. Quills and middle 

 tail feathers brownish-black . bewickii. 

 Above ashy-brown ; beneath, in- 

 cluding flanks, clear white; 

 rump ashy, and, like seconda- 

 ries, very obsoletely barred. 

 Quills and middle tail feathers 

 grayisii-brown . . . leucogaster. 



Colors intermediate between the 

 two last. Bill longer, from 

 nostril, .50, from gape .81, in- 

 stead of .39 and .70 . . spilurus. 

 2. Exposed surface of wings barred ; upper tail 

 coverts not barred. Beneath white. Tail 

 feathers reddish-brown, banded with black, 

 except in petenicus. 



a. Above quite uniform reddish-chestnut. 



1. Sides ashy ..... poliopleura. 



2. Sides brownish .... mfalbus. 

 S. Grayish-brown above, rump rufescent. 



1. Sides brownish .... sinaloa. 

 Crissum plain, without bands. 



1. Outside of wings obsoletely banded. Beneath 



white ; flanks and crissum fulvous. 



a. Bill shorter than tarsus . . . moatsius. 



2. Outside of wings and wing coverts distinctly 



banded. Beneath white ; flanks and anal 

 region very pale fulvous. 



a. Bill longer than tarsus . . . albipectus, 



3. Similar to last above ; throat white ; rest of 



under parts fulvous. 



