BUTEO. 231° 
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 latter, always more or 
less streaked and spotted, especially across belly 
and on sides of breast, with dusky. Young: Tail 
banded with grayish 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, cul- 
men .98—1.10, tarsus 2.85-3.50, middle toe 1.60-1.80. 
Hab. Gulf States and lower Mississippi Valley, 
north, casually, to Kansas, Iowa, Illinois, and 
Pennsylvania, east to Georgia. 
338. B. borealis harlani (Avp.). 
Harlan's Hawk. 
g®. 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 subterminal 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 without 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 ochraceous. Male: 
Length about 19.00-22.50, extent 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, culmen 1.00-1.15, tarsus 3.15-3.40, middle 
toe 1.60-1.70, weight 3-4 pounds. West usually in 
tall trees. £ggs 2-4, 2.30, or more, X 1,80, or 
