STRIGIDiE.] 



OSTEOLOGIA AVIUM. 



[BUBONINJS. 



Measurements. 



Tenths. 

 Length of humerus 19 



Length of ulna . 21 



Length of radius 20 



Length of metacarpus 9^ 



Length of femur 14 



Length of tibia 19 



Length of metatarsus 9^ 



Length of sternum 11 



Tenths. 

 Breadth of posterior margin of sternum 8 

 Breadth of anterior margin of sternum 7^ 

 Depth of keel 3 



Length of head . 

 Breadth of head . 

 Length of pelvis . 

 Breadth of pelvis 



19 

 15 



16 



Illustrations. 



Sternum, Plate IV. fig. 6. 



Metatarsus, Plate II. fig. 8. 



Subfam. 2. Bubonin^e. 

 Otus, Cuv. 



Brachyotus, GW, type of Buboninw. 

 The skeleton much more powerful than among the Strigince ; sides of the cranium 

 much flattened ; the palatine bones broader at their hinder extremities. Interarticular 

 bones very small, and not articulated to the basal portion of the sphenoid. Nasal orifices 

 oval. Sternum with the manubrial process rudimentary. Posterior metacarpal bone 

 not arched, except very slightly at its proximal extremity, where it is also flattened. 

 Metatarsus without any annular process. Head of the tibia with the anterior processes 



much developed. 



Measurements. 



Tenths. 



Length of humerus 32 



Length of ulna 35 



Length of radius 34 



Length of metacarpus 17 



Length of femur 21 



Length of tibia 33 



Length of metatarsus 15 



Length of sternum ...... 16 



Tenths. 



Breadth of posterior margin of sternum 10 

 Breadth of anterior margin of sternum 10^ 



Depth of keel 3^ 



Length of head 22 



Breadth of head 16 



Length of pelvis 22 



Breadth of pelvis 10^ 



Illustrations. 



Palatine bones, Plate VI. fig. 12. 



Sternum, Plate IV. fig. 7. 



Otus, Cuv. 



Maculosus, Vieill. 

 Very similar to Nijctea nivea ; the sides of the head above the orbits not flattened as 

 30 



