STRIGID.E.] OSTEOLOGIA AVIUM. [STRIGINJ3. 



Measurements (continued). 



Tenths. 

 Breadth of posterior margin of sternum 12 



Breadth of anterior margin of sternum 12 



Depth of keel ....... 3 



Length of head 17 



Tenths. 



Breadth of head . , 15 



Length of pelvis 23 



Breadth of pelvis 10-^ 



Illustration. 

 Sternum, Plate IV. fig. 10. 



Strix, Linn. 



Pratineola, Bon. 



I have only the sternum, coracoids, and furculum of this bird ; the former is in shape 

 similar to S. flammea, but larger, and coracoids and furculum longer. 



Strix, Linn. 



Delicatulus, Gould. 

 Similar to S. flammea, except in size, but bears the same proportions. 



Illustrations. 



Sternum, Plate IV. fig. 1. Palatine bones, Plate VI. fig. 11. 



Metatarsus, Plate II. fig. 10. 



Strix, Linn. 



Capensis, A. Smith. 

 Similar to S. flammea, but the tarsus has not the annular process to confine the 

 tendons of the extensor muscles of the feet at its proximal extremity. 



Syrnium, Sav. 



Sinense, Lath. 



All the bones I possess of this bird are the head and metatarsus taken from a skin ; 

 the cranium is of similar shape to that of Nyctea ; the metatarsus is without the annular 

 process, though in other respects similar. 



Athene, Bote. 



Marmorata, Gould. 

 The whole skeleton similar to Strix, but with the palatine bones terminating more 

 abruptly at their hinder extremities ; the sternum has a very small manubrial process ; 

 its posterior margin has two large fissures on each side, the outer one larger, the inte- 

 rior one small ; the metatarsi are very short, the head similar to Nyctea. 

 28 



