Falconid^e.] 



OSTEOLOaiA AVIUM. 



[Cikcin^e. 



nearly the whole of the roof of the mouth, and the metatarsi longer in proportion to the 

 tibiae. 



Sternum with a double foramen on the right side and a single one on the left. 



Measurements. 



Tenths. 

 Length of humerus 30 



Length of ulna 32 



Length of radius 30 



Length of metacarpus 18 



Length of femur 24 



Length of tibia ....... 33 



Length of metatarsus 25 



Length of sternum 20 



Tenths. 



Breadth of posterior margin of sternum 1 2 



Breadth of anterior margin of sternum 1 



Depth of keel 5 



Length of head 24 



Breadth of head 16 



Length of pelvis 24 



Breadth of pelvis 11 



Illustrations. 



Sternum, Plate III. fig. 3. 



Palatine bones, Plate VI. fig. 9. 



Ierax, Vig. 



Bengalensis, Briss. 



The only fragment of this bird that I have seen is one in the British Museum, sent 

 home by Mr. Hodgson. The sternum has, as represented in Plate III. fig. 9, two 

 fissures on each side of the keel, in that respect much resembling the sternum of some 

 Owls. 



Illustration. 

 Sternum, Plate III. A. fig. 9. 



Subfam. 2. Circin^e. 

 Accipiter, Briss. 



Nisus, Linn. 



The head of Acci'piter is very similar to that of Falco, but has the lacrymals pro- 

 jecting more outwards from the skull, and the upper maxillaries without the notch on 

 their edge. 



The sternum is narrower, with the foramina on the posterior margin not so large, 

 the manubrial process longer, and the horizontal plane more convex. The metatarsal 

 bones are longer in proportion to the tibiae, and are nearly without a calcaneal process, 

 and with a deep channel down them posteriorly ; anteriorly they do not differ much 

 from Faleo, but are not so strongly marked. The bones composing the pelvis are 

 longer and narrower than in Falco. 



5 



