Strigid^e.] 



OSTEOLOGIA AVIUM. 



[Strigin^e. 



Measurements. 



Tenths. 



Length of humerus 31 



Length of ulna 33 



Length of radius 32 



Length of metacarpus 16 



Length of femur 22 



Length of tibia 32 



Length of metatarsus 15 



Length of sternum ....... 16 



Tenths. 

 Breadth of posterior margin of sternum 11 

 Breadth of anterior margin of sternum 10 J 



Depth of keel 3J 



Length of head 23 



Breadth of head 16 



Length of pelvis 23 



Breadth of pelvis 10 



Illustration. 

 Sternum, Plate IV. fig. 11. 



Athene. 



Hypudea, Bon. 



Differs very slightly from A. marmorata, except in measurements. The central 

 channel over the vertex is not so well denned, and the back of cranium not so much 

 flattened ; the depressed posterior edge of the upper part of the orbits is not apparent ; 

 the channel for the masseter muscle is well marked ; the sternum is rather longer in 

 proportion to its width, and the bones of the pelvis rather broader in proportion to 

 their length. 



The bird ought to form a different genus from Athene. 



Measurements. 



Tenths. 



Length of humerus 20 



Length of ulna 22 



Length of metacarpus ..... 11 



Length of femur 15 



Length of tibia 22 



Length of metatarsus 15 



Length of sternum 12 



Tenths. 

 Breadth of po sterior margin of sternum 8 

 Breadth of anterior margin of sternum 8 



Depth of keel 4-| 



Length of head 20 



Breadth of head . 12 



Length of pelvis ........ 18 



Breadth of pelvis 8 



Ntctale, Brehm. 



Tenymalmi, Gin. 

 Skeleton very similar to Athene, but with the sternum narrower in proportion to its 

 width ; the posterior fissures deeper, and the anterior edge of the keel more receding. 

 No manubrial process ; the coracoids proportionately longer. 



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