BUTEO. . . 231 



dusky, either color predominating (except 

 the last) according to the individual, crossed 

 near end by a more or less distinct subter- 

 minal band, and tipped with whitish ; upper 

 parts chiefly (sometimes entirely) dark sooty 

 brown or blackish (varying to deep black) ; 

 lower parts varying from entirely deep sooty 

 brown or black to pure white, but, if the lat- 

 ter, always more or less streaked and spotted, 

 especially across belly and on sides of breast, 

 with dusky. Young : Tail banded with gray- 

 ish brown and dusky,- the two colors of about 

 equal extent ; otherwise, much like adult. 

 Male: Length 20.00-21.00, wing 14.25-16.10, 

 tail 8.80-10.00, culmen .98-1.00, tarsus 2.75- 

 3.50, middle toe 1.50-1.70. Female: Length 

 22.00-23.50, wing 15.75-16.50, tail 9.10-10.00, 

 culmen .98-1.10, tarsus 2.85-3.50, middle toe 

 1.60-1.80. Sab. Gulf States and lower Missis- 

 sippi Valley, north, casually, to Kansas, Iowa, 

 Illinois, and Pennsylvania, east to Georgia. 

 338. B. harlani (Atjd.). Harlan's Hawk. 

 Feathers of head and neck more or less distinctly 

 edged with ochraceous or rusty. Adult : Tail 

 rufous, paler at tip, usually crossed near end 

 by a narrow band or bar of blackish (rarely 

 with more or less distinct narrow bands, or 

 indications of bands, anterior to the subter- 

 minal band) ; upper parts chiefly or entirely 

 dusky grayish brown, sometimes irregularly 

 broken by admixture of whitish and brownish 

 gray ; lower parts varying from entirely pure 

 white (usually with dusky streaks across 

 belly) to wholly sooty blackish, with or with- 

 out rusty on breast. Young: Tail grayish 

 brown, varying to dull ochraceous, crossed by 

 nine or ten well-defined narrow bands of 

 blackish ; otherwise much like adult, but 

 usually with much less of tawny or ochra- 

 ceous. Male : Length about 19.00-22.50, ex- 

 tent of wings 49.00-53.00, wing 13.50-16.50, 

 tail 8.50-10.00, culmen .95-1.08, tarsus 2.40- 

 3.20, middle toe 1.60-1.70, weight 2-3 pounds. 

 Female: Length 23.00-25.00, extent 54.00- 

 57.50, wing 15.25-17.75, tail 9.50-10.50, cul- 



