xv, i Shufeldt: The Monkey-eating Eagle 49 



soaetus pelagiciis) , found in Kamchatka and Japan as well as in 

 Korea, may be a bigger bird in some respects. Sharpe included 

 the Old World vultures in the true raptorial group. In the 

 genera Vultiir and Serpentariits there are some big species the 

 comparative weights and proportions of which have never been 

 taken for a series of living specimens or compared with the cor- 

 responding data on Pithecophaga jefferyi. 



I have never compared the wedge-tailed eagle, Uroaetus audax 

 Lath., of Australia and. Tasmania, with our present subject ; but 

 I am inclined to believe that it is not so large a bird. 



The radial crest of the humerus of the white-headed eagle of 

 the United States is also triangular in outline; while in Aquila 

 chrysaetos canadensis this feature of the bone under considera- 

 tion is not so lofty and, while triangular in general outline, it 

 extends very much farther down the shaft of the bone. Here, 

 too, the osseous emargination of the pneumatic fossa is broader 

 and more extensive, thus closing in upon the true cavity, though 

 in no other way diminishing its capacity. 



The bearded vulture of Europe has a humerus fully one-third 

 larger than that bone in Pithecophaga, and its characters are 

 very similar, the most striking departure being the shallow pneu- 

 matic fossa in the former species, with all of its foramina 

 merged into one subcircular foramen. 



In the antibrachium of Pithecophaga both the ulna and the 

 radius exhibit some degree of curvature between proximal and 

 distal extremities. Air gains access to their interiors through 

 minute foramina at the proximal and the distal end of each; at 

 tne latter situation they articulate in the usual manner with the 

 radiale and the ulnare of the carpus, bones that here present 

 the 'avian characters usually seen among the eagles. The 

 radius has an extreme length of some 20.5 centimeters, and the 

 ulna is about 2 centimeters longer than this. The latter bone 

 has a double row of osseous papilla? down its cylindrical shaft; 

 these, as in other birds, are for the attachment of the quill butts 

 of the secondary feathers of the wing. There are ten in each 

 row, and all, to the last pair at either end, are opposite each 

 other. The anterior third of the radius is subcylindrical in form, 

 while the remainder of the shaft is trihedral on section. Its 

 "radial tuberosity" is concaved in the center, with the inner 

 margin sharp. Our harpy eagle skeleton lacks the bones of the 

 forearm and manus. 



Thallasoaetus pelagiciis has the radius and the ulna much 

 longer than the monkey-eating eagle, and each is markedly 



166316 4 



