1920.] Ornitholoyy of the Island of Texel. 393 



on the shore, the other Terns keeping further out in deeper 

 water. Adult birds were in full moult at the end of August 

 (body, wings, and tail), as were the adults of the other two 

 species. Recorded as breeding (all authors) ; also " breeds 

 on the other Dutch islands " (L. J.). 



Little Gull. 



An immature and an adult seen on 25 September in 

 the bay at Do Cocksdorp. 



Black-headed Gull. 



Numerous during both visits and no migratory movements 

 noted. Leege-Juist records four small colonies — the largest 

 in reed-beds at Waterburg, the smallest at Nieuweschild on 

 small reedy islets, one at the Mill at Oost on grass, and 

 another at Oudeschild. It also breeds on Vlioland, but not 

 on the other islands. " Breeds " (lli.). 



Common Gull. 



Very numerous in August on the polders and on the sand- 

 banksj whither flocks from the interior of the island used to 

 "flight" at dusk. The majority were birds of the year. In 

 September this species was the commonest of the Gulls, and 

 adults appeared to preponderate. According to Schlegel, 

 there was formerly a small colony on Texel, but apparently 

 it does not breed now on any of the Dutch islands, but does 

 so on Sylt (L.J.). Recorded as breeding in Thijsse's list. 



Herring-Gull. 



Abundant on the shore in August ; in September fairly 

 common, but scarce compared with the last species. "Breeds" 

 (D. & Th.). " Single pairs breed in the dunes by De Cocks- 

 dorp; breeds on all the other Dutch islands in small numbers, 

 except on Rottum where there is a large colony" (L.J.). 



Lesser Black-backed Gull. 



It is curious that, although particularly looked for, this 

 species was not met with on either visit. I do not think 

 we overlooked it. Daalder says it is seldom seen on the 

 Texel coast. This is stranae, as it is a common breeding 



