Falconidjs.] 



OSTEOLOGIA AVIUM. 



[BUTEONIK^. 



Length of humerus . 

 Length of ulna 

 Length of radius . . 

 Length of metacarpus 

 Length of femur . . 

 Length of tibia . . 

 Length of metatarsus 

 Length of sternum . 



Measurements. 



Tenths. 



16 



Tenths. 



Breadth of posterior margin of sternum 12 

 Breadth of anterior margin of sternum 11 



Depth of keel 5 



Length of head 22 



Breadth of head 14 



Length of pelvis 17 



Breadth of pelvis 10 



Subfam. 4. Buteoninje. 



Buteo, Cuv. 



Vulgaris, Bechst. 

 Type of Buteoninee. 



Sternum as described in Archibuteo, except in size. Metatarsi very similar to Circus, 

 but with the calcaneal process and the keel proceeding downwards from it highly 

 developed, and the fibula extending downwards for two-thirds the length of the tibia. 

 Palatine bones very similar to Cireaetos, but more rounded on their outer posterior 

 margins. 



Measurements. 



Tenths. 



Length of humerus . . . . . . . 30 



Length of ulna 34 



Length of metacarpus 20 



Length of femur 25 



Length of tibia 33 



Length of metatarsus . . . . . 18 



Length of sternum 29 



Tenths. 

 Breadth of posterior margin of sternum 1 7 

 Breadth of anterior margin of sternum 12 



Depth of keel 8 



Length of head ....... 27 



Length of pelvis 28 



Breadth of pelvis ........ 14 



Archibuteo, Brehm. 



Aquilinus, Hodgs. 

 A body of this bird is in the British Museum, sent home by Mr. Hodgson. The 

 sternum is broad in proportion to its length, has two foramina on its posterior margin, 

 and is slightly hollowed out in the centre ; the keel is not continued to within an inch 

 of the posterior margin. 



Measurements. 

 Tenths. Tenths. 



Length of humerus 

 Length of ulna 



Length of radius . . 

 Length of metacarpus 



VOL. I. 



