220 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



//. Underparts whitish or buffy, spotted or streaked with dark brown. 



g. Underparts with deep brownish or dusky prevailing, making 



the breast look dark brown marked with whitish instead of 



whitish marked with brown; the brown marks decidedly 



rufescent (western North America). 



B. lineatus elegans, juv. (p. 287) 

 gg. Underparts with buffy or buffy whitish prevailing; dark brown 

 marks not rufescent. 

 h. Size larger; wings, cf usually over 315 mm., 9 usually over 

 335 mm. 

 i. The thighs unspotted with dark brown or only slightly so 

 marked (North America east of Great Plains). 



B. lineatus lineatus, juv. (p. 281) 

 ii. The thighs with numerous dark brown spots or markings 

 (coastal Texas e. to Louisiana). 



B. lineatus texanus, juv. (p. 289) 

 hh. Size smaller; wings, cT usually under 315 mm., 9 usually 

 under 335 mm. 

 i. Size very small, wings, cf under 280 mm., 9 under 310 

 mm. (southern Florida and Florida Keys). 



B. lineatus extimus, juv. (p. 292) 

 ii. Size larger; wings, cf usually over 285 mm.; 9 usually over 

 310 mm. (South Atlantic and Gulf States). 



B. lineatus alleni, juv. (p. 290) 

 et. Outer webs of primaries not spotted with white, buffy, or ochraceous. 

 /. Middle toe without claw equal to, or shorter than, not longer than, 

 the bare portion of the tarsus in front. 

 g. Tail black, crossed by three broad bands, which are ashy gray 

 on outer webs and pure white on inner ones. 

 h. Size larger; wings, cT over 375 mm., 9 over 405 mm. (south- 

 western United States, Mexico to Panaina). 



B. albonotatus albonotatus, ad. (p. 275) 

 hh. Size smaller; wings, cf under 350 mm.; 9 under 402 mm. 

 (Pearl Islands, Panama to northern South America). 



B. albonotatus abbreviatus, ad. (p. 279) 

 gg. Tail dark grayish brown (the inner webs partly or wholly white), 

 crossed by numerous narrow, oblique bands of black. 

 h. Size larger; wings, cj' over 375 mm.; 9 over 405 mm. (south- 

 western United States, Mexico, sovith to Panama). 



B. albonotatus albonotatus, juv. (p. 275) 

 hh. Size smaller; wings, cf under 350 mm., 9 under 402 mm. 

 (Pearl Islands, Panama, to northern South America). 



B. albonotatus abbreviatus, juv. (p. 279) 

 //. Middle toe without claw decidedly longer than the bare portion 

 of the tarsus in front. 

 g. Middle toe without claw not more than 37 mm. long. 



B. buteo buteo (extralimital)" 



" Falco buteo Linnaeus, Syst. Nat., ed. 10, i, 1758, 90 (Europe; restricted type 

 locality. Savoy; Britisli Ornithologists' Union, List Brit. Birds, ed. 2, 1915, 139). — 

 Buteo buteo buteo Peters, Check-list Birds of World, i, 1931, 235; Hartert, Vog. 

 pal. Fauna, ii, 1914, 1120. 



