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BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



than the rump, becoming whitish toward the bases of the inner webs of 

 the outer rectrices, pale neutral gray below, sharply tipped with 

 white, and crossed by three (sometimes a fourth is concealed by the 

 upper tail coverts) broad, sharply defined bands of sooty black to 

 fuscous-black, the last, which adjoins the white tips, the broadest; 

 lores gi-aj'ish; ear coverts and sides of nock varying from white tlu'ough 

 pale neutral gray, vinaceous-buff with a grayish wash, to wood brown, 

 sayal brown, cinnamon-brown, or russet, finely streaked with black; 

 throat white, occasionally pinkish buff or cinnamon-buff, with line, 



Figure 14. — Accipiter cooperii. 



hairlike shaft streaks of blackish; remainder of underparts white 

 with fine black shaft streaks broken by detached transverse bars of 

 avellaneous, cinnamon, sayal brown, or tawny-olive, which are ex- 

 tremely variable in form and width, sometimes presenting the ap- 

 pearance of arrowhead marks, at others spreading longitudinally along 

 the shafts so that the white ground color is reduced to spots and oc- 

 casionally completely obhterated on the flanks and chest; sides of 

 chest usually shaded with gray; tibiae regularly banded with orange- 

 cinnamon, sayal brown, tawny or russet, sometimes uniform tawny 

 or russet; abdomen less heavily marked, sometimes uniform white; 



