LARUS GELASTES. 299 



In winter. Head and neck streaked and spotted with brown ; legs pale 

 brown. 



Young. Head, neck, and underparts white, mottled with light brown ; 

 tail with black band at end. Primaries black or dark brown, with white 

 spots at the end or next the end. Length 18 inches. 



341. Larus audouini, Payraudeau. Audouin's Gull. 



This Mediterranean Gull is recorded by Natterer as having 

 been once obtained near Tarifa, and has since then occurred at 

 Malaga. 



Lord Lilford, who discovered them breeding in 1874 off the 

 south of Sardinia on a rocky island, and also found them on the 

 island of Alboran in April, 1879, kindly gave me the following 

 notes of the colours of the soft parts, which will serve to distin- 

 guish the adults of this species : 



" Feet and legs very dark grey, claws black. Bill brilliant 

 coral-red, with one broad black band. Iris brilliant hazel, pupil 

 black. Inside of mouth pale flesh-colour. Eyelids coral-red." 



The following are the measurements (in inches) of a pair, 



taken from the dried skins : 



d. $. 



Bill from gape 3'00 2'80 



Wing, carpus to tip 15'75 15'75 



Tarsus 2'45 2'30 



Tail 6-00 6-00 



Length 20 inches. 



342. Larus gelastes, Lichtenstein. The Slender-billed Gull. 



Favier only records a single specimen of this Gull as obtained 

 by him near Tangier, in 1852 ; but he remarks that the feet of 

 the immature birds are orange-yellow, which would lead to the 

 supposition that he observed them more often. 



They are not uncommon in spring on the coast of Southern 

 Spain, nesting near the mouth of the Guadalquivir, where 



