Their Eggs and Nests. 193 



ICELAND GULL — {Larus leucopterus ; formerly, L. 

 Islajidicus). 



Lesser Wbite-winged Gull. — A bird which has been 

 obtained in this country from time to time, but in 

 cases of no great frequency. 



KITTIWAKE— (i^zi-j-^ tridactyla ; formerly, Larus 

 tridactylus). 



Tarrock, Annet. — A very common rock-breeding Gull, 

 met with on almost all parts of our coasts, and nesting 

 in great numbers in many different localities. Flam- 

 borough Head, St. Abb's Head, the Bass, more than 

 one of the Fame Islands, are such places. It places 

 its nest of sea-weed high up on the face of some rocky 

 steep on a narrow ledge, and deposits therein, for the 

 most part, three eggs. These differ much in colour 

 and in the amount and position of the spots ; some 

 are stone-coloured, some tinged with an olive shade, 

 and some with a bluish cast. The spots and blotches 

 are of ash-grey and two or three shades of brown, 

 chestnut to umber. — Fig. \, plate XI I. 



IVORY GULL — {Pagophela ebtirnea ; formerly - 



Larus eburuetcs). 

 Snow-bira. — A bird of very rare occurrence. 



GREAT OR COMMON ^KlJk—iStercorarius catar- 

 rJiactes ; formerly, Lestris catarrhactes). 



Skua Gull, Brown Gull, Bonxie. — We pass here 

 into a somewhat different class of birds. The Skua is 

 as bold and insolent as most of the Gulls are timid 

 and retiring. In many instances these birds do not 



