836 LARUS 



1149. SLATY-BACKED GULL. 

 LARUS SCHISTISAGUS. 



Larus schistisagus, Stejneger, Auk, 1884, p. 231 ; Tacz. F. O. Sib. 0. 

 p. 1024 ; Saunders, Cat. B. Br. Mus. xxv. p. 258 ; Ridgway, p. 29 ; 

 L. marmus (nee. Linn.), Swinhoe, Ibis, 1874, p. 165 ; Seebohm, 

 B. Jap. Emp. p. 291. ; 



O-seguro-kamome, Jap. 



< ad. (Kuriles). Head, neck, tail, and under parts white ; wings and 

 mantle dark slate ; scapulars and secondaries tipped with white ; quills 

 black, the inner webs of the outer ones grey ; third quill with a distinct 

 white spot between the grey and the black on the inner web ; bill rich 

 yellow with a red subterniinal spot on the lower mandible ; legs and feet 

 dull purplish flesh-colour. Culmen 2*28, wing 18'0, tail 7'6, tarsus 2-7 

 inch. 



Hctb. Coasts of Eastern Siberia, the Bering and Okhotsk Seas ; 

 the Kurile Islands, and Northern Japan in winter. 



In habits it does not differ from its allies. It breeds in the 

 Kurile Islands, but its eggs appear to be undescribed. 



1150. GREATER BLACK-BACKED GULL. 

 LARUS MARINUS. 



Larus mar'mus, Linn. Syst. Nat. i. p. 225 (1766) ; Naurn. x. p. 438, Taf. 

 268, 269 ; Hewitson, ii. p. 501, pi. cxli. fig. 1 ; Gould, B. of E. v. 

 pi. 430 ; id. B. of Gt. Brit. v. pi. 55 ; Audub. B. Am. pi. 241 ; 

 Dresser, viii. p. 427, pi. 604 ; Saunders, Cat. B. Br. Mus. xxv. 

 p. 241 ; id. Manual, p. 677 ; Ridgway, p. 28 ; Lilford, vi. p. 57, 

 pi. 25. 



Gotland a manteau noir, French ; Gfaivota, Alcatraz, Portug. ; 

 Gavinbt, Span. ; Mugnaiaccio, Ital. ; Mantel-mowe, German ; 

 Mantelmeeuw, Dutch ; Veidi-bjalla, Svart-baJeur, Icel. ; Svartbag- 

 maage, Dan. ; Hafmaage, Norweg. ; Haf strut, Swed. ; Merilokki, 

 Finn. 



ad. (Sweden). Head, neck, tail, and entire under parts white ; mantle 

 black with a slaty tinge ; primaries black washed with slate on the inner 

 web, the first and second with a broad white tip, the second with a black 

 band across the white, the third with a narrow white tip, the inner ones 

 with the terminal portion slate-grey, with a black subterniinal band and 

 white tip ; secondaries and scapulars tipped with white ; bill light yellow 

 with a red patch towards the end of lower mandible ; legs and feet 

 greyish white with a fleshy tinge ; iris hazel ; edge of eyelids vermilion. 

 Culmen 3'5, wing 20'0, tail 9'0, tarsus 3'0 inch. 



