Al'PKXDIX O. 



143 



APPENDIX G. 



On Buteo leucops and Buteo galapagensis. 



Amongst the synonyms of Buteo galapagensis Mr. Sliarpe 

 places B. leucops of G. R. Gray^ a name given by Mr. Gray 

 to a single specimen in the British Museum which was col- 

 lected during the voyage of the 'Beagle/ and was thus 

 entered in the list of specimens of Bu'ds in the British 

 Museum, published in ISJrrt : — " The Galapagos Buzzard, 

 Buteo galapagoensis, Craxirex galapagoensis, Gould, Voy. of 

 Beagle, Zool. t. 2. {a) Galapagos Archijjclago, presented 

 by Sir W. Burnett and Capt. Fitzroy, R.N.^'' In the next 

 edition of the museum list, published in 1848, the title of 

 this specimen was altered to " Buteo leucops, the White-faced 

 Buzzard," no. 13, p. 36; in Mr. Gray's 'Hand-list' (1869) 

 it appears as '' Tachy trior chis leucops," no. 64, and as distinct 

 from " Craxirex galapagoensis," no. 47. 



I have recently examined this specimen without being able 

 entirely to satisfy myself as to the species to which it really 

 belongs. It is a very young bird, as is proved by the appear- 

 ance of the corners of the mouth and by the bases of the 

 primaries being still in their sheaths ; it bears a general 

 resemblance in coloration to the first plumage of both 

 B. galapagensis and B. erythronotus, differing, however, from 

 any specimen which I have seen of either in that dress in 

 being much less variegated on the interscaj^ular and upper 

 scapular feathers, that appearance being caused by the 

 fulvous edgings to those feathers being in jB. leucops ex- 

 tremely narrow and inconspicuous. 



In the first plumage of Buteo erythronotus all the tints of 



