47 



142. 



142a. 



142b. 



Biiteo borealis borealis (rjiiiel.), H.N., 1. ]). 26(5 

 (1788). [Carolina.] 

 Red -tailed Buzzard. 



Light form, pure white below with few or no 



markings ; sub-terminal tail-bar reduced or 



obliterated. 



Buteo borealis krideri (Hoopes). Pr. Ac. Nat. 



Soc. Philad., 1873. p. 238. pi. 5. [loica.] 



Krider's Hawk. 



Strong]}^ develo])ed form of B. borealis borealis, 

 more strongly marked below, especially 

 on thighs, and Avith more bars than the 

 sub-terminal one on tail ; raelanisms are 

 frequent, but thev Tisuallv retain the rufous 

 tail. 



Buteo borealis calurus Cassin, Proc. Ac. Nat. 

 Sci. Philad., vii., p. 281 (1855). [Neiv Mexico.] 

 Western Red-tail. 



E. North 

 America, N. 

 to Canada 

 and New- 

 foundland 

 W. to Gt. 

 Plains. 



Gt. Plains, 

 from Mis- 

 souri and 

 Minnesota, 

 W. to Rocky 

 Mountains, 

 N. to S. 

 Manitoba. 



W. North 

 America, be- 

 yond W. edge 

 of Gt. Plains 

 E. to Middle 

 Yukon, S. to 

 Guatemala ; 

 Guadaloupe 



142c. 



Perhaps a melanism of B. borealis borealis : 

 size similar, but more robust ; nearly uniform 

 sooty-brownish-black, with much less of 

 concealed white ; tail mottled with greyish, 

 dusky- white and rufous, with subterminal 

 black band. 



Buteo borealis harlani (Aud.), Bds. Am., i., p. 

 86 (1830). [Louisiana.] 

 Harlan's Buzzard. 



Lower 

 Mississippi 

 Valley & Gulf 

 States, from 

 Louisiana to 

 Georgia and 

 Florida. 



