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 haemapophysis 



FIG. 128. LEFT FOOT OF Bubo (AFTER BEDDAED). 



on 10. In Strix the catapophyses on C9 are distant. Photo- 

 dihix is like Ketupa. 



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

 notched in' other owls, five ribs are attached. Dr. COUES ' 



Key to N. American -Bm/.v. 



