PLATE XLI. 



W. D. Latimer, Photo.] 



A. 



Winter plumage 

 (Immature). 



Fig. 1. 

 BLACK-HEADED GULLS. 



B. C. D. 



Nuptial plumage Autumn plumage Winter plumage 



(Mature). (Immature). (Mature). 



Specimens B, C, D, collected and mounted by the- late Mr. E. Williams. 



E. Williams, Photo.} ;pjg 2. 



THE LAKE, ST. STEPHEN'S GREEN, DUBLIN. 



Among the pinioned water-fowl are to be seen a number of Black-headed Gulls in 

 winter plumage, which have taken up their abode on the lake. 



