MUSCICAPIDJ3.] 



OSTEOLOGIA AVIUM. 



[TlTYRINJE. 



Hirundo, Linn. 



Riparia, Linn. 



Cranium shorter and more rounded than in Muscicapa ; palatine bones of nearly the 

 same form, but sloped more on the inner sides towards the interarticular ones, which 

 are very short. 



Sternum similar to Muscicapa, but rather longer in proportion to its width. 



Pelvis similar. 



Scapula very long and thin, very slightly expanded towards the tip, not much 

 deflexed. 



Wing-bones with the humerus much shorter than the scapula, not being above three- 

 fourths of its length ; ulna nearly twice as long as the humerus. 



I have also portions of the skeletons Progne purpurea, Hirundo pceciloma, and Domestica, 

 all of which agree in form with the foregoing. 



Measurements. 



Tenths. 



Length of humerus 4 J 



Length of ulna 8 



Length of metacarpus .... 4 



Length of femur 5 



Length of tibia ....... 7 



Length of metatarsus .... 3 J 



Length of sternum 7 



Tenths. 



Breadth of posterior margin of sternum 5 



Breadth of anterior margin of sternum 3 J 



Depth of keel 2j 



Length of head 9 



Breadth of head 5 



Length of pelvis 8 



Breadth of pelvis 7 



Illustrations. 



Skeleton, Plate VIII. F. 



Palatine bones, sternum, pelvis, and 

 metatarsus, Plate XV. 



Tityra, Vieill 



Cayana, Linn. 



Cranium with the palatine bones similar to Muscicapince, but more massive, and with 

 their inner edges slightly deflected; intertarcular bones expanding slightly at their 

 distal extremity ; masseter impression strongly marked. 



Sternum with the marginal fissures small, nearly closed; manubrial process of 

 moderate length, with the distal extremity widely branched. 



Pelvis similar to Tyrannus. 



Furculum much arched anteriorly ; rami divaricating considerably from their junction, 

 afterwards nearly parallel. 



Scapula as long as humerus, expanded towards the tip, gradually deflexed. 



Vertebral column with the penultimate and three next vertebrae with dorsal processes. 



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