1919-] Birds of the Canary Islands. 759 



island*. I was again in Gran Canariaon the 1st of Jnne, Imt 

 all tlie Gnlls had disappeared. I then imagined that they 

 had resorted to the outer islets to breed, but I proved this 

 supposition to be unfounded in June 1913, when I visited all 

 the outer islets aud the large is^lands of the eastern group 

 excepting the East Rock. I did not find this Gull anywhere 

 during the six weeks I spent in May and June, though 

 constantly on the coasts and on the look out for it (Ibis, 

 1914, p. 288). 



The question as to whether this Gull Avas indeed Lams 

 fasciis (I finis, was entered into in 'The Ibis,^ 1912, pp. 575, 

 57(), et Bull. B. O. C. xxix. p. 121. ^^ow, thanks to Mr. H. 

 F. Witherby, Ave are able to state that, at any rate, some 

 of the birds which breed in Great Britain visit the Canary 

 Archipelago in winter — as Ave have conclusive evidence in 

 two cases Avhich I have already reported (Ibis, 1914, p. 288). 

 {a) Lesser Black-backed Gull marked as a nestling 



(No. 33,912) on August 2, 1913, at the Fame 



Islands, recovered off Cape Juby on November 



13, 1913, by schooner ' Luz.' 

 (h) Another bird ringed on the same day at the Fame 



Islands, shot in Lanzarote on January 5, 1914. 

 Rauf/e. The British Lesser Black-backed Gull breeds on 

 the Avestern coasis and islands of Europe, ])robably as far as 

 Spain, also on Alboran island off Morocco. It winters in 

 the western Mediterranean, in the Azores and Madeira 

 group, and West Africa to the Gold Coast, while it has even 

 been reported as far south as Bonny in southern Nigeria 

 (Saunders). 



Lams ridibundus. Black-headed Gull. 



Lams ridibundus Linn. Syst. Nat. l.'Jth ed. 1766, p. 225 

 — Type locality : England. 



An Occasional Visitor which appears in fair numbers on 

 rare occasions. 



According to Cabrera (Catalogo, p. 66) and Polatzek 

 (Orn. Jahrb. 1909, p. 133), neither of Avhoni had seen the 



*• Three were obtained — the skins are in the Britisb Museum. 



3g2 



