BVTEO. 233 



borciilis, Ibe plumage sometimes 

 wholly dusky (except ihe tail), as iu 

 the adult. 



Tail of adult always with a black 

 subterminal bar, and frequently 

 with several, more or less com- 

 plete, additional bars. Er/gs 2.31 

 X 1-80. Hab. Western Xorth 

 America, south into Mexico, cast 

 to Eocky Mountains (casually to 

 Illinois). 



337b. B. borealis calurus 



(Cass). 'Westerii Red-tail. 



h^. Tail of adult without any black bars; otherwise, 



much like B. borealis calurus. Mab. Cape St. 



Lucas. 



337c. B. borealis lucasanus Eidgw. 



St. Lucas Eed-tail. 



/'. Middle too not more than 1.55; tail of adult (and young) 



grayish brown, sometimes slightly touched with rufous, 



crossed by an indefinite number (but varj-ing from 



about 10 to 13) of narrow bands of dusky, which 



become gradually indistinct and finally obsolete toward 



base. 



Plumage exceedingly variable, but usually a mixture 



of sooty brown and whitish, in variable relative 



quantity; sometimes entirely dusky (except tail) 



and rarely almost entirely white ; length about 



20.00-23.00, wing 15.50-16.G0, tail S.SO-lo.OO, cul- 



men .85-.95, tarsus 3.00-3.50, middle toe 1.40-1.55. 



Hab. Northern portions of eastern hemisphere; 



accidental in Michigan? 



33C. B. buteo (Linn.). European Buzzard. 

 dP. Middle toe not decidedly longer than bare portion of tarsus in front ; 

 length of cere on top greater than depth of bill at anterior edge 

 of cere. 



Plumage uniform black, or blackish brown, the feathers pure 

 white at bases ; tail grayish brown or grayish, more or less 

 banded with black, the inner webs, however, chiefly white. 

 Adult : Tail black, crossed by three broad zones, which are 

 ash-gray on outer webs and pure white on inner. Young : 

 Tail dark grayish brown (the inner webs partly, sometimes 

 entirely, white), crossed by numerous narrow, oblique band.s 

 of black. Male: Length 18.50-19.60, extent 49.50, wing 



