250 



STRUCTURE AND CLASSIFICATION OF BIRDS 



bifid hypapophysis, and on C9 the catapophyses nearly form 

 a canal. Posterior catapophyses begin on C12, whence they 

 gradually climb the hypapophyses. Bubo bengalensis is 

 much the same, save that there is not a bifid hsemapophysis 



Fig. 128. — Left Foot of Bubo' (aptek Beddakd). 



on 10. In St7-ix the catapophyses on C9 are distant. Photo- 

 dilus is like Ketupa. 



To the sternuna, which is one-notched in Strix and two- 

 notched in other owls, fiye ribs are attached. Dr. CoUES ' 



Key to N. American Bit ds. 



