438 



comparable to those of the preceding bird, take place, 

 maturity being reached about the fifth year. 



BEAK. Yellow, red at the angle. 



FEET. Flesh-colour. 



IEIDES. Straw-yellow. 



AVERAGE MEASUREMENTS. 



TOTAL LENGTH ... 29 in. Female smaller. 



WING 19 



BEAK 2'6 ,, 



TARSO-METATARSUS ... 3 ,, 

 EGG 3 x 21 in. 



Allied Species and Representative Forms. L. schisti- 

 sagus, 1 of Stejneger, occurs in Behring and Okhotsk Seas. 

 It is on the whole smaller and lighter on the back and 

 wings than L. marinus. 



GLAUCOUS GULL. Lams glaucus (0. Fabricius). 



Coloured Figures. Gould, ' Birds of Great Britain,' vol. v, pi. 

 57 ; Dresser, ' Birds of Europe,' vol viii, pi. 605 ; Lilford, 

 ' Coloured Figures,' vol. vi, pi. 26 ; Booth, ' Kough Notes,' 

 vol. iii, pi. 38. 



The Glaucous Gull, 2 another magnificent sea-bird which 

 almost equals the great Black-backed Gull in size, is an 

 autumn and a winter visitor to our shores from more 

 northern latitudes, occurring chiefly in severe weather. 

 A certain number appear to remain until spring, especially 

 in North Britain, where the species is most frequently met 

 with. In the Shetlands it has been observed as late as 

 June, 3 but has never bred there (Saunders). In the Solway 



1 According to Mr. Saunders " L. schistisagus has no close affinity 

 with L. marinus, but rather inclines to the Herring-Gull section" (Cat. 

 Birds Brit. Mus., vol. xxv, p. 260). 



2 Dr. Lawrence Edmonston first introduced it to notice as a British 

 bird, having obtained young individuals in the Shetlands in 1809, 1814, 

 and up to 1821, when he proposed naming it Larus islandicus. In 

 March, 1821, he described an adult bird. 



3 In Ireland, three instances of its occurrence in July, are stated by 

 Thompson (Nat. Hist. Irel.). 



