Hawks. 



34 1. Sennett White-tailed Hawk (Buteo albicauda- 

 tus sennetti). L. cf, 21; 9 , 23. T I iree outer primaries 

 cut. Ads. Grayish slate above. Yng. Above 

 brownish black; breast usually white, thro:\t 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. j 



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

 (Bailey.) 



347a. American Rough-legged Hawk {Archibuteo 

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

 No. 348. L. cT, 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. Yng. 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 

 legs. 



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. rf, 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 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 



17; 9 



. Prairie Falcon (Falco 'mexicanus) 

 20. A blackish patch on the sides. 



L. c?, 



Ad. c?. 

 Above including middle tail feathers, grayish brown; 

 back with more or less concealed buffy bars. Ad. 9. 

 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.) 



135 



34-8v 





355. 



