PAGOPHILA.
Legs feathered to heel-joint ; tarsus shorter than middle toe and claw.
Pagophila eburnea (Phipps). IVORY GULL.
? winter and summer. Pure white. Bill slaty blue, tip yellow. Legs and feet black. Eye-rim orange red, iris brown. Wing 335-365. Tarsus 39-42. Bill 32-36. Immature: greyish on face and throat ; spots on upper parts and occasionally under parts, tips of quills, and subterminal band on tail dark brown.
fireeds. — Circumpolar ; Spitzbergen, Nova Zembla, Franz Joseph Land, Islands off N. Asia and Arctic N. America to N.W. Greenland. Occurs in winter occasionally on N.\V. European Coasts, chiefly Faroes, Shetlands, Orkneys, Scandinavia and Finland ; rarely south as far as N.W. France ; in America south to New York and British Columbia.