OSTEOLOGY OF BIRDS 



29 



rj.-ia. 



^ if 



Pygostyles of various Old and New World vultures and Hawks 



Fig. 2 (a. o')Sarcorhamphus giyphus 



Fig. 3 (fc. h') Gy parch us papa 



Fig. 4 {c.c'jCathartes a. septentrionalis 



Fig. s (d. d') C a t har i s t a urubu 



Fig. 6 (e. e') Neophron percnopterus 



Fig. 7 (/./') Gypogeranus serpentarius 



Fig. 8 (g) O t o g y p s c a 1 v u s (after Lucas) 



Fig. 9 (g') Vultur cinerea (after Lucas) 



Fig. 10 {h. h') Falco sparverius 



Fig. II (i. t')Accipiter cooperi 



Fig. 12 (/. /') Micrastur brachypterus 



Fig. 13 (k. fe') Circus hudsonius 



Fig. 14 (l. I') Polyborus tharus 



