AVES FALCONID^. 



645 



shaded with slaty grey, hoary in character, and crossed with many deeper 

 seal-brown bars ; the primaries become white on their inner webs for two- 

 thirds of their length, and this color is not marked in any way after it loses 

 the brown terminal region ; secondaries much like the primaries in shade 

 and color, rather more heavily barred, tipped with deep buff, and the white 

 region of the web barred with seal-brown ; the rest of the upper wing- 



FiG. 328. 



Biitco erythroitoUis. Dark plumage. P. U. O. C. 7865. About one-fourth natural size. 



coverts much like the interscapular region, deep seal-brown, tipped, mar- 

 gined and mottled with deep buff; under wing-coverts deep buff, inclining 

 to rufous, with barring of deep seal-brown ; axillaries paler buff, marked 

 and barred heavily with deep seal-brown. 



Lower parts : Deep tawny buff; streaked on the chin and upper throat 

 with deep seal-brown ; center of the upper breast immaculate, the sides 



