LARIN^E. LARUS. 247 



305. LARUS GLAUCUS. GLAUCOUS GULL. 



Bill two inches and three-fourths along the ridge, which is 

 moderately decurved toward the end, ten- twelfths high at the 

 angle, which is prominent ; tarsus three inches long ; wings 

 about an inch shorter than the tail ; total length from twenty- 

 six to thirty-two inches. In winter, the bill wine-yellow, the 

 lower mandible with an orpiment-red patch toward the end ; 

 the margins of the eyelids straw-yellow ; the feet flesh-co- 

 loured ; the back and wings light bluish-grey ; the quills all 

 white at the end ; the head and neck white, streaked with 

 very pale brown ; all the other parts pure white. In summer, 

 the bill gamboge-yellow, the patch on the lower mandible 

 carmine, as are the edges of the eyelids ; the head and neck 

 pure white ; the other parts as in winter. Young with the 

 bill brownish-black toward the end, at the base greyish-yel- 

 low, the feet flesh-coloured ; the general ground-colour of the 

 plumage pale yellowish-grey ; the head and neck longitudi- 

 nally streaked with very pale brown ; the upper parts with 

 transverse irregular bands, the lower confusedly mottled and 

 barred with pale brown and yellowish-white ; the quills 

 greyish-white, irregularly marked with pale brown ; the tail 

 pale grey, spotted and barred with pale brown. 



Male, 30, 62, 19-J, 2f, 3, 2 T V, T 5 ? . Female, 28, 60. 



In summer dispersed over the arctic seas, in winter advanc- 

 ing into the temperate regions. Dr Lawrence Edmondston 

 first introduced it to notice as a British bird, having obtained 

 young individuals in Shetland in 1809, 1814, and up to 1821, 

 when he proposed naming it Larus islandicus. In March 

 1821, he described an adult bird. I have seen it in the Heb- 

 rides and the Frith of Forth, and it has been observed on va- 

 rious parts of the coast of England. It has not been found 

 breeding with us. The eggs are broadly oval, pale yellowish- 

 grey, dotted and spotted with dark brown, and blotched with 

 pale purplish-grey. 



Burgomaster. Iceland Gull. 



Larus glaucus, Brunnich, Gmelin, Latham 1 Larus glau- 

 cus, Tern. Man. d'Ornith. ii. 7&7. Iceland Gull, Edmond- 

 ston, Mem. Wern. Soc. iv. 176, 182. Larus glacialis, Mac- 

 Gillivray, Mem. Wern. Soc. v. 270. Larus glaucus, Glaucous 

 Gull, Macgillivray, Brit. Birds, v, 



306. LARUS LEUCOPTERUS. WHITE-WINGED GULL. 



Bill nearly two inches along the ridge, which is moderately 

 decurved toward the end, eight-twelfths high at the angle, 

 which is little prominent ; tarsus two inches and a half long ; 



