Hawks. 
335. Harris Hawk (Parabuteo unicinctus harris?) 
L. 3, 19; 2, 22. Longer upper tail-coverts, base and 
tip of tail white. Ads. Shoulders, thighs and under 
wing-coverts, reddish brown; under tail-coverts white. 
Yng. Similar but streaked below with rusty, buff and 
black; legs barred with white. Notes. A long, harsh, 
Buteo-like scream. (V. Bailey.) 
Range.—Middle America from Panama north to southern Texas, 
rarely Mississippi and southern California. 
“ 337. Red-tailed Hawk (Buteo borealis). L. Q', 20; 
@,23. Four outer primaries notched. Ads. Tail 
rusty brown with a black band, sometimes broken, 
near its tip; below buffy white, a band of spots across 
the belly; legs usually without bars. Yung. Tail gray- 
ish brown with a rusty tinge and numerous blackish 
bars; upper tail-coverts barred black and white; below 
less buffy than in adult; legs more often barred. Notes. 
A. shrill whistle, suggesting the sound of escaping 
steam. 
Range.—Eastern North America, west to the Great Plains, north to 
About latitude 60° ; breeds throughout its range; winters from Mass- 
achusetts, Illinois and South Dakota southward. 
337a. Krider Hawk (8. 0. driderii), Similar to 
No. 337, but nearly or wholly white below. Ads. 
Usually without black tail band. 
Range.—"Great Plains of United States from Minnesota to Texas; 
east irregularly or casually to Iowa and northern Illinois.’”’ (Bendire). 
337b. Western Red-tail (8. 0. calurus). Very 
variable in color. Ads. Sometimes sooty brown 
abeve and below with more or less rusty; in light phase 
resembles No. 337, but tail averages paler and some- 
times has more than one bar; the underparts are deeper 
and legs are usually barred with rusty. Yng. Similar 
to Yung. of No. 337, but markings below heavier; 
flanks more barred. 
Range.—Western North America from Rocky Mountains to Pacific: 
north to British Columbia, south to central America; generally resi- 
dent. 
337d. Harlan Hawk (B. d. hbarlani). Ads. Above 
sooty brown; tail closely mottled with blackish, rusty 
and whitish; below varying from white, more or less 
spotted on belly to sooty brown. Yung. Similar, but 
tail barred with blackish, gray, rusty or whitish, 
Range.—‘‘Gulf States and Lower Mississippi Valley, north (cas- 
ually) to. Kansas, Iowa, Illinois and Pennsylvania; east to Georgia 
and Florida.”’ (Bendire). 
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