OSTEOLOGICAL AND OTHER NOTES ON THE MONKEY- 
EATING EAGLE OF THE PHILIPPINES, PXTHECO- 
PHAGA JEFFERYI GRANT 
By R. W. Shufeldt 
Major, Medical Corps, United States Army, Washington, D. C. 
ELEVEN PLATES 
Some time during the latter part of March, 1918, the captive 
specimen of the monkey-eating eagle of the Philippines ( Pithe - 
cophaga jefferyi Grant), of the botanic garden of Manila, died, 
and the dead bird was immediately sent to the Bureau of Science, 
Manila. In his letter to me of April 1, 1918, Mr. McGregor stated 
that from this material he — 
got a good skin — the first! in our collection, although we have a poor 
mounted specimen. The bones are being cleaned. They will lack the feet, 
the skull, and the ends of the wings. However, I shall supply a head and 
a foot from another specimen, so that the thing is nearly complete. The 
description of this should make a good paper, especially if you can lay 
hands on bones of the harpy eagle and other related genera. 
All this material was received by me in the summer of 1918 ; 
and it was in excellent condition. I prepared and photographed 
the specimens myself. Later, the division of birds of the United 
States National Museum kindly loaned me certain skeletons, with 
which I intended to compare the bones of Pithecophaga jefferyi. 
These consisted of an imperfect skull of Morphnus guianensis 
(Daudin), adult (No. 18468) ; a complete skeleton of an adult 
Thallasoaetus pelagicus (Pallas), collected by Paul L. Jouy in 
Korea (No. 18222) ; an Aquila chrysaetos canadensis (Gmelin), 
female, adult, complete and disarticulated (No. 18802) ; a com- 
plete, disarticulated skeleton of Gypaetus barbatus (Linnseus) 
(No. 17834) ; a complete skeleton, disarticulated, of Halixetus 
leucocephalus (Linnseus), adult (No. 19278); and, finally, an 
incomplete skeleton of the harpy eagle, Thrasaetos harpy ja (Lin- 
naeus) , adult (No. 225806) . The last-named specimen lacked the 
skull. This bird was, during life, for several years one of the 
ornaments of the bird collection of the National Zoological Park 
at Washington. The skull was probably left in the skin. Sub- 
sequently I endeavored to obtain a skull of this species from the 
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