106 THE ZOOLOGIST. 



where. This is very probable, as nothing is more common in 

 summer than to see large numbers of immature Herring-Gulls 

 frequenting localities where this species does not breed. The 

 dark rocks of the Lleyn. coast set off the peculiarly delicate 

 colours of this bird to perfection. 



Lesser Black-backed Gull. — I saw one at the Bird Bock, 

 and I believe one other (but too far off to be sure of, though it 

 looked too small for its relative) near Abersoch. "When we con- 

 sider that this bird breeds not far away, it is surprising how rare 

 it is in Lleyn. Bay and Willughby, however, saw it at Pwllheli 

 on May 30th, 1662. The former writes : — " We saw another 

 Larus, more black on the back, and that had yellow legs " 

 ('Itineraries'). An early mention of this bird as British. 



Great Black-backed Gull. — There were adult birds (two on 

 one occasion) in the harbour on three days, and I saw another 

 at Llanbedrog. 



Kittiwake. — Not at all numerous, but a few to be seen off the 

 shore, and there were a few flying over the sea about the Bird 

 Kock. This is a true marine Gull — a bird of the sea and the 

 rocks — and not seen in the muddy harbour or on the fields. 

 Almost every one I saw closely was adult. One morning when 

 it was blowing very hard, and there was a fine sea on, two Kitti- 

 wakes (young and old) were flying up and down off and outside 

 the great rock called Careg yr Imbril (probably once an island), 

 which stands at the mouth of and shelters the harbour. They 

 were fully exposed to the strong wind which flung the spray on 

 high, while just inside, had they chosen, they could have found 

 shelter. 



