950 Receiitiij published Ornithological Works. [Ibis, 



Such characters as change of type of egg with season, 

 associations of nest and egg patterns, of nests and eggs, of 

 green or brown colour, and mottling with size and shape of 

 the eggs, are all considered and worked out with tables and 

 mathematical forniuhe and equations. 



Less difficult to understand are some good photographs of 

 the birds tiieniselvcs as well as their nests, while the chief 

 types of the eggs are figured in colours. 



It is impossible in a short notice to analyse the results 

 obtained, and we would refer those of our readers who are 

 interested in such studies to the paper itself. 



ShufeJdt on the Monkey-eatiny Eagle. 



[Osteological and other notes on the Monkey-eatinf^ Eagle of the 

 Philippines, Pithecophaga jefferyi Grant. By R. W. Shufeldt. Philip- 

 pine Journ. Sci. xv. 1910, pp. 31-58, 11 pis.] 



But little is known of the anatomy and affinities of Pithe- 

 cophaga, one of the most remarkable forms of Accipitrine 

 birds, discovered by the late Mr. John Whitehead in the 

 Philippine Islands, and described and figured in 'The Ibis/ 

 by Mr. Olgivie-Grant in 1897. Dr. Shufeldt's study on the 

 osteology of this eagle is based on the skeleton of a bird 

 which died in captivity in the Botanical Garden at Manilla, 

 and which was sent to him thence by Mr. McGregor. A full 

 description of the skull and other bones is given and com- 

 parisons made with other large Accipitrine birds. Unfor- 

 tunately Dr. Shufeldt was unable to secure a skull of the 

 large South American Harpy Eagle, Thrasa'etos harpyja, for 

 comparison, though he obtained the loan of an incomplete 

 skeleton. He comes to the conclusion that so far as his 

 osteological material permitted him to form one, that 

 Pithecophaga is most nearly allied to Thrasaetos. The 

 memoir is illustrated with reproductions of j)hotographs of 

 the bones both of the Monkey-eating Eagle as well as 

 of those used for the comparisons. 



This memoir adds considerably to our knowledge since, so 

 far as we are aware, nothing previously had been published 

 ill I'C'gard to the osteology of this bird. 



