OSTEOLOGY OF BIRDS 29 



Pygostyles of various Old and New World vultures and Hawks 



Fig. 2 (a. a') Sarcorhamphus giyphus Fig. 9 (g') Vultur cinerea (after Lucas) 



Fig. 3 (i. 5') Gyparchus papa , Fio. 10 (it. Falco sparverius 



Fig. 4 (c. c')Cathartesa. septentrionalis Fig. n (i. *') Accipiter cooperi 



Fig. s (d. ci')Catharista urubu Fig. 12 ( j. f) Micrastur brachypterus 



Fig. 6 (e. <?') Neophron percnopterus Fig. 13 (i Circus hudsonius 



Fig. 7 (/./') Gypogeranus serpentarius Fig. 14 (2. /') Polyborus tharus 



Fig. 8 (g) Otogy ps calvus (after Lucas) 



