341. Sennett White-tailed Hawk (B8uteo albicauda- 
tus sennettt). L. 3,21; 2,23. Three outer primaries 
cut. Ads.  Grayish slate above. Yung. Above 
brownish black; breast usually white, throat blackish, 
belly heavily marked with rusty and blackish; some- 
times wholly black below; tail generally szvery gray, 
white on inner webs with numerous indistinct blackish 
bars. Notes. A cry much like the bleating of a goat 
(Merrill. ) 
Range.—From southerr. Texas and Arizona south to Mexico.” 
(Bailey.) 
* 347a. American Rough-legged Hawk (4rchibuteo 
lagopus sancti-johannis). B..7 deep, smaller than in 
No. 348. L. o', 21; 9, 23. Legs feathered to the 
toes. Ads. Basal half of tail white, end half barred 
with black; belly with more or less black. Yung. No 
black bars on end half of tail; buffier below, more 
black on belly. Black phase. Black more or less 
varied with brown and rusty as it approaches light 
plumage of ad. or yng; but to be known by feathered 
egs. 
Range.—North America; breeds north of United States; winters 
south to Virginia, Missouri and central California. 
“348. Ferruginous Rough-Leg (Archibuteo ferrugi- 
neus). B. 1. deep, larger than in No. 347a; L. 6’, 22; 
2,24. Legs feathered to toes. Ads. Above rich 
rusty streaked with black; legs rusty barred with 
black; tail grayish sometimes washed with rusty. 
Yng. Above blackish brown murgined with rusty; 
below white; breast with a few streaks; legs spotted; 
tail with inner webs and base white; outer webs grayish. 
Dark phase. Sooty brown more or less varied with 
rusty; tazl as tn ad. 
Range.—Western North America from the Plains (east North Da- 
kota to Texas) , west to the Pacific and from the Saskatchewan region 
south into Mexico; casually east to Illinois. Breeds from Utah, Colo- 
rado and Kansas north to the Saskatchewan Plains.’’ (A. O. U.) 
355. Prairie Falcon (Falco mexicanus), L. 3, 
17; 2,20. A blackish patch on the sides. Ad. Q. 
Above including middle tail feathers, grayish brown; 
back with more or less concealed buffy bars. Ad. @. 
No buffy bars on back. Yung. Above margined with 
rusty and whitish; head much asin ad. Notes. Kee, 
kée, kee and asort of cackle. (Bendire.) 
Range.—"‘United States from the eastern border of the Plains to the 
Pacific and from the Dakotas south into Mexico; casual east to Illi- 
nois. Breeds throughout Its United States range.”’ (A. O. U.) 
135 
Hawks, 
