51 o 



RISSA TRIDACTYLA. THE BLACK-FOOTED 

 KITTIWAKE. 



KITTIWAKE. ANNET. TARKOCK. 





Fig. 93. 



Larus Rissa. Lian. Syst. Nat. I. 224. Adult. 



Larus tridactylus. Linn. Syst. Nat. I. 224. Young. 



Larus tridactylus. Lath. lud. Ornith. IL 817. 



Kittiwake. Mont. Ornith. Diet, and Supplt. 



Mouette tridactyle. Larus tridactylus. Temm. Man. d' Ornith. IL 274. 



Kittiwake. Larus Rissa. Selby, Illustr. II. 403. 



Larus Rissa. Kittiwake. Jenyns, Brit. Yert. Anim. 



Rissa tridactyla. Bonap. Comp. List, 62. 



Bill shortish, rather stout, about an inch and a half in 

 length, Jive-twelfths high at the knoh ; tarsus an inch and a 

 quarter long ; tail even, interdigital membranes with a concave 

 continuous margin. Adtilt in ivinter tvith the bill pale green- 

 ish-yelloiv ; feet black; back and, wings light bluish-grey ; tips 

 of five outer primaries, and outer iveb of first, black ; the rest 

 of the plumage pure white, except the hind part of the neck and 

 the occiput, which are pale hluish-grey. Adult in summer 

 tvith the head and neck pure white, the other parts as in 

 tvinter. Young loith the bill black, the feet greenish-grey ; the 



