LARUS. BIRDS. 311 



L. argentatus, Brun. Silvery Gull or Herring-Gull of Latham, 

 Mantle bluish-cinereous ; legs livid ; length of the tarsus two 

 inches and a half; wings very little exceeding the tail ; quilU 

 feathers black, near the extremity, but tipt with white, and their 

 shafts blackish. 21 to 22 inches long. Inhabits Europe. B. 

 Leivin's Brit. Birds, vi. pi. 7- 



"L.fuscus, Lin. Lesser Black-Backed Gull. Mantle slate-black ; 

 legs yellow ; length of the tarsus two inches and one or two lines ; 

 the wings stretching about two inches beyond the extremity of 

 the tail ; the bill proportionally shorter and more slender than in 

 the preceding. 18 or 19 inches long. Europe. B Shaw, xiii. 194. 



L. eburneus, Lin. Ivory Gull. Body quite white ; legs black ; a 

 very small naked spot on the tibia ; length of the tarsus one inch 

 five lines. 19 inches long. Inhabits Greenland. Tern. Man. 769. 



L. canus, Lin. Common Gull or Sea Mew. Head, occiput, nape, 

 and sides of the neck white, spotted with blackish brown ; all 

 the lower parts white ; back, scapulars, and wings bluish cinere- 

 ous ; quills towards the tip deep black ; length of the tarsus two 

 inches ; wings reaching beyond the tail ; shafts of the two outer 

 quill-feathers black ; bill small. 16^ inches long. Inhabits Eu- 

 rope. B Don. Brit. Birds, vi. pi. 79. 



L. tridactylus, Lath. Tarrock or Kittiwake Gull. Top of the 

 head, occiput, nape, and part of the sides of the neck, bluish 

 ash-coloured ; fine black lines before the eyes ; region of the eyes, 

 lower parts, rump, and tail, white ; back and wings bluish ash- 

 coloured, the exterior quill-feather bordered with black ; bill 

 greenish yellow ; iris brown ; length of the tarsus one inch four 

 lines ; a clawless tubercle in place of a hind-toe. 15 inches long. 

 Inhabits European Seas. B. Shaw, xiii. pi. 21. 



L. melanocephalus, Natterer. Adriatic Gull. Bill thick and strong; 

 shoulders and back pure ash-coloured; all the feathers of the 

 wings terminated by a large white space; length of tarsus 2 inches. 

 15 inches long. Coasts of the Adriatic Sea. Tern, Man. 777- 



L. atricilla, Lin. Bill and legs deep lake red ; shoulders and back 

 deep bluish cinereous ; quill- feathers black, extending two inches 

 beyond the tail ; length of the tarsus 1 inch 9 lines. Nearly 14 

 inches long. Inhabits Europe and America. Tern. Man. 779. 



L. ridibundus, Leisler. (Z/. cinerarius, Gmel. ; the young, Sterna 

 obscura, Lath, and after moulting L. eri/thropus.) Red-legged 

 Gull. Head, neck, and tail white, with the exception of a black 

 spot before the eyes, and another on the surface of the ears ; 

 breast, belly, and abdomen, whitish, slightly tinted with rose-co- 

 lour ; back, scapulars, and coverts of the wings bluish ash-co- 

 loured ; exterior margin of the wings white ; length of the tar- 

 sus 1 inch and 8 or 9 lines ; bill and legs vermilion. 14 inches 

 long. Inhabits Europe. B. Shaw, xiii. pi. 22. 



L. capistratus, Tern. Brown Masked Gull. A clear brown mask, 



