Hawks 



34 1. Sennett White-tailed Hawk {Buteo alhicauda- 

 tits sennetti) . L. cT, 21; $,23. Three outer primaries 

 cut. Ads. Grayish slate above. Yng. Above 

 brownish black; breast usually white, throat blackish, 

 belly heavily marked with rusty and blackish; some- 

 times wholly black below; tail generally silvery gray, 

 white on inner webs with numerous indistinct blackish 

 bars. Notes. A cry much like the bleating of a goat 

 (Merrill.) 



Range.— From southern Texas and Arizona south to Mexico." 

 (Bailey.) 



347a. American Rough-legged Hawk (Archibuteo 

 lagopus sancti-johannis) . B. .7 deep, smaller than in 

 No. '348. L. tf, 21; ?, 23. Le.u;s feathered to the 

 toes. Ads. Basal half of tail white, end half barred 

 with black; belly with more or less black. Yng. No 

 black bars on end half of tail; huffier belovv, 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 kaown by feathered 

 legs. 



Range. — North America; breeds north of United States; winters 

 south to Virginia, Missouri and central California. 



348. Ferruginous Rough-Leg (Archibuteo ferrugi- 



ntus). B. 1. deep, larger than in No. 347a; L. tf, 22; 

 $,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 margined 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; tail as in ad. 



Range. — Western North America from the Plains (east North Da- 

 kota to Texas) . west to «he 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.) 



35 5. Prairie Falcon {Falco mexicanus). L. tf, 



17; ?,2o. A blackish patch on the sides. Ad. tf. 

 Above including middle tail feathers, grayish brown; 

 back with more or less concealed buffy bars. Ad. ?. 

 No buffy bars on back. Yng. Above margined with 

 rusty and whitish; head much as in ad. Notes. Kee', 

 kee, kee and a sort 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.) 



yJsa 



34-8. 



135 



