The Gannetry at " The Stack,'" Orkney Inlands. 631 



surface, H. principalis having the entire breast, bell}'^, and 

 flanks pinkish vinaceous, while in H. simplex the unclerparts 

 are bluish grey with a faint purplish wash. Both species 

 have the middle of the belly white. 



The only note which Alexander has made ou this bird is 

 that it was numerous amongst the cocoa plantations. 



Count Salvadori (Orn. Golfo d. Guinea, i. 1903, p. IG) 

 gives a list at the end of his paper of doubtful or 

 erroneously identified species from Prince's Island. 



These include a species of Lanius, Sylvia, and Motacilla ; 

 also Cinnyris splendidus (Shaw), Chalcomitra senegalensis 

 (Linn.), Lamprotornis cenea (Gra.), and Mtlanobucco vieilloti 

 (Leach); he does not consider that any of these should be 

 included as having occurred on the island. 



Dohrn also did not believe tliat any of the last four species 

 mentioned had ever beenmet with on the island. They were 

 originally included as having occurred on Prince's Island 

 on the authority of Erman, whom Dohrn proves to be quite 

 i;n reliable. 



Dohrn also remarks that he is certain Neophron pileatus 

 13urch. does not occur on Prince's Island. It was included 

 on the authority of Lopez de Lima^ who never personally 

 visited the island. 



Neophron pileatus is a South African species, but it is very 

 likely that Neophron monachus occasionally wanders to the 

 islands in the Gulf of Guinea. An inexperienced observer 

 might very easily mistake one for the other. 



XXXIX.— TAe Gannetry at " The Stack,'' Orkney Islands. 

 By J. H. GuRNEY, F.Z.S. 



(Plate XXVI.) 



Situated nearly forty miles to the west of the Orkneys are 

 two small islands, known collectively to seafaring men as 

 Stack and Skerry, of which the former, where the Gannets 

 are, is about 130 feet in height and covers six acres. 

 Here these birds are supposed to have bred from time 



