372 ^Ir. O. Salvin on the Birds of 



thronotus being, as its name implies, dark rich red all over 

 the interscapulary region. 



The immature bird is not to be distinguished from the 

 young of the continental representative. 



INIr. Reed (Ibis, 1874, p. 84) says that he believes this Buz- 

 zard to have been attracted to Mas-afuera by the numbei's 

 of domestic cats which abound in a wild state in the island. 

 This can hardly be ; for, in the first place, the Biazzard, though 

 a powerful bird, is no match for a cat ; and then, again, the 

 question arises, on what did the Buzzards live before cats 

 were introduced into the island by the Spaniards? It can- 

 not be that they have assumed their present specific differ- 

 ences from B. erythronotus during the short time the cats 

 have been there, probably little more than two centuries. I 

 have little doubt that the food of these birds consists to a great 

 extent, if not entirely, of refuse thrown up by the sea. just as 

 is the case with the Buzzard of the Galapagos Islands, or Crus- 

 tacea, upon which Buteo borealis feeds in the island of Socorro. 



Besides B. exsul two other Hawks occur in Hen* Ley hold's 

 collection, viz. : — 



BuTEO SWAINSONI. 



The range of this bird has recently been shown by Mr. Ridg- 

 way (N. Am. B. iii. p. 263) and Mr. Sharpe to extend to the 

 region of the La Plata, and even to Patagonia. The single 

 skin (an adult) agrees closely with an example from the latter 

 locality in the British Museum. 



Circus macropterus, Vieill. 



Circus macropterus, V.; Scl. & Salv. Nomencl. p. 118. 



This bird has a very extensive range in South America. 

 The single specimen sent agrees very well with continental 

 examples. 



There are also two specimens of 



HjEMATOPUS ater, 

 agreeing with Falkland-Island skins. I also find two Petrels, 

 one being the common 



Daption capensis. 



The other is a species of (Estrelata, perhaps allied to (E. 



