SHUFELDT.] OSTEOLOGY OF THE CATHARTIDA. 761 
PYGOSTYLES OF VARIOUS OLD 4ND NEW WORLD VULTURES AND HAWRS. 
Zz we 
a and a’, lateral and rear view of pygostyle of Sarcorhamphus gryphus, respectively; 6 and b’, the 
same for Gyparchus papa; ce, c’, for Oathartes aura; d, d', Catharista atrata; e, e', Neophron perc- 
nopterus ; f, J’, Gypogeranus serpentarius; g, Otogyps calvus; g', Vultur cinerea; h, h', Tinnunculus 
sparverius; % and i, Accipiter cooper; j, j', Micrastur brachypterus; k, k’, Oircus hudsonius; land 
U, Polyborus tharus. 
