144 LIST OF DrUENAL BIEDS OF PKET. 



brown, both the darker and also the paler and more fnlvous, 

 are decidedly less intense than in B. galapagensis of a cor- 

 responding age ; and in this respect B. leucops resembles the 

 immature B. erythronotus , as it also does in its narrow white 

 frontlet, which is entirely absent in all the immatui'e speci- 

 mens that I have seen of B. galapagensis. 



The dimensions of B. leucops agree fairly with those of the 

 smaller males of B. erythronotus, but differ from those of the 

 males of B. galapagensis in the following particulars, viz. the 

 tarsus in B. leucops is a little longer, but the measurements 

 of the middle toe, the wing, and the bill are all less ; it 

 should, however, be added that immature examples of 

 B. galapagensis only partially exhibit the remarkable develop- 

 ment of the bill which especially characterizes the adults of 

 that species. 



On the whole, I incline to the opinion that B. leucops 

 should be referred to B. erythronotus rather than to B. gala- 

 pagensis, or it may possibly be the young of some South- 

 American species distinct from both^ If it be not a young 

 B. galapagensis, the locality assigned to it is probably, through 

 some accident, a mistaken one. 



I have taken the annexed measurements (p. 145) of the 

 specimens of Buteo galapagensis now in the British Mviseum 

 and in the collection of Messrs. Salvin and Godman, and 

 also of the specimen which bears the name of Buteo leucops, 

 to which I have added, for comparison, those of two males of 

 Buteo erythronotus, preserved in the Norwich Museum, one 

 being quite a young specimen, and the other an adult. 



* In B. leucops the first three primaries only are emarginated, in which 

 it resembles the other Buzzards of the group to which it belongs. 



