400 Mr. H. Saunders on the 



301. RiSSA TRIDACTYLA. 



Abundant outside the Straits of Gibraltar in winter, but be- 

 comes rarer to the eastward. 



302. Larus gelastes. 



By no means uncommon on the coast ; and I strongly suspect 

 that it breeds at the mouth of the Guadalquivir, near San 

 Lucar de Barrameda. 



303. Larus canus. 



A winter visitant, and by no means a numerous one. 



304. Larus audouini. 



This Gull was obtained by Natterer near Tarifa, and has also 

 occurred in the Baleai*ic Islands, where, however, I had not the 

 good fortune to see it. It is said to breed in the island of 

 Sardinia, which is not far off and presents similar natural 

 features. 



305. Larus argentatus. 



Abundant in winter on the coast, especially outside the 

 Straits of Gibraltar; within these straits it gives place to its 

 congenei', 



306. Larus leucoph^us (Licht.). 



This species, or race, is smaller than L. argentatus, and has 

 distinctly yellow legs and feet, like those of adult L. fuscus. I 

 found great numbers breeding at the Dragonera. 



307. Larus fuscus. 



Abundant in winter and early spring ; but I saw no signs of 

 its breeding on any part of the coast or islands. 



308. Larus marinus. 



Not uncommon in immature plumage; but adults ai'e rare. 



309. Lestris catarractes. 

 Observed outside the Straits of Gibraltar. 



310. Lestris parasitica. 



A winter visitant ; but almost all the specimens I have seen 

 of this and the following species have been in immature 

 plumage. 



