BRITISH BIRDS. 193 



chin are dull white, and under parts are much mottled 

 with white. Length 9*00, wing 8*50. Young : like adults 

 in winter, but almost entirely white below and mottled 

 with brown on mantle. 



Formerly breeding commonly in East Anglia, but now 

 chiefly known as a migrational visitor in small numbers 

 to our coasts. 



GENUS CLXXXVI. ANOUS, Stephens (1825). 



335. Anous stolidus (Linn.). NODDY. 

 Hab. Tropical regions of the globe. 

 Two were shot off Co. Wexford about 1830. 



Sub-Family 



GENUS CLXXXVII. PAGOPHILA, Kaup (1829). 



336. Pagophila eburnea (Phipps). IVORY GULL. 

 Hab. Circumpolar regions. 



Scarcely more than thirty examples have been obtained 

 in the British Isles. 



GENUS CLXXXVIII. RISSA, Stephens (1825). 



Bill shorter than head, rather stout, compressed, upper 

 mandible arched and decur ved towards tip ; tail moderate, 

 nearly even ; tarsus short ; hind toe obsolete ; front toes 

 fully webbed. 



337. Rissa tridaetyla (Linn.). KITTIWAKE. 



Hab. Northern Palasarctic and N.E. Nearctic regions. 



Adult : mantle and wings grey ; outer primaries black 



on terminal portions ; rest of plumage pure white ; bill 



yellowish ; feet blackish. In winter nape is slate-grey. 



o 



