OSTEOLOGY OF BIRDS 



2 9 



Pygostyles of various Old and New World vultures and Hawks 



Fig. 2 (a. o') Sarcorhamphus gryphus 



Fig. 3 (b. b') Gyparchus papa 



Fig. 4 (cc')Cathartes a. septentrionalis 



Fig. 5 (d. d') Cat harista urubu 



Fig. 6 (e. e') Neophron percnopterus 



Fig. 7 (/./') Gypogeranus serpentarius 



Fig. 8 (g) O t ogy ps calvus (after Lucas) 



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



Fig. 10 (h. h') Falco s parvenus 



Fig 11 (*. i') Ac cipiter cooper 1 



Fig 12 (/. /') Micrastur brachypterus 



Fig 13 (k. k') Circ us. h udsoni us 



Fig. 14 {I. I') Polyborus tharus 



