570 Report of State Geologist. 



the lower mandible; feet, flesh color." Young. — Above, yellowish- 

 white, mottled with pale brown; breast and lower parts, gray; tail, 

 white, mottled with brown. 



Length, 36.00-32.00; wing, 16.75-18.75; tail, 7.40-8.50; bill, 

 2.30-2.70. 



Eange. — Northern part of Northern Hemisphere. In America, 

 south to the Great Lalces and Long Island. Breeds from Greenland 

 and Hudson Bay north. 



Nest, of seaweed, grass and moss on ground. Eggs, 2-3, white, 

 ashy or grayish-brown; 3.05 by 2.21. 



Occasional visitor along Lake Michigan. Mr. J. W. Byrkit informs 

 me of its occurrence near Michigan City. Mr. F. M. Woodruff has a 

 beautiful specimen in white plumage that he killed at Millers, Ind., 

 August 8, 1897. Prof. A. J. Cook reports it from Michigan localities, 

 notably St. Joseph County, 1892. He also refers to the fact that Prof. 

 Ludwig« Kumlein has taken several specimens at Milwaukee, Wis. 

 (Birds of Michigan, p. 31). Mr. E. W. Nelson (Birds of Northeastern 

 Illinois, p. 145) notes that Dr. Hoy had taken three of these gulls near 

 Eacine, Wis. Careful attention needs to be paid to the larger gulls 

 upon the lakes and larger streams during the colder portions of the 

 year, in order that more accurate information may be had concerning 

 them. Mr. L. M. Turner (Contr. to N. H. of Alaska, 1887, p. 125) 

 says this gull is the ealiest bird to arrive at St. Michaels, a few reach- 

 ing there by the middle of April. Mr. Nelson (Cruise of the Steamer 

 Corwin in the Arctic Ocean, p. 106) notes the different surroundings 

 of this gull in Behring Sea, where it breeds on all the islands and 

 shores, from those peculiar to it on the North Atlantic coast, where it 

 is known as Ice Gull, and is so well known as the accompaniment of 

 the ice pack of that region. 



10. (43 ) Larus leucopterus Fabbr. 



Iceland Gull. 



SynuDviu, Whit£-w[kgf:i> Gull. 



Adult. — "Primaries entirely white, or palest possible pearly-blue, 

 fading insensibly into white at some distance from the end; their shafts 

 straw-color; mantle, palest pearly blue; bill, yellow, with vermillion 

 spot on lower mandible; feet, flesh colored or pale yellowish. In 

 Winter. — Head and neck slightly touched with dusky. Young. — Im- 

 pure white, with or without trace of pearly on the mantle; head, 'neck 

 and upper parts mottled mth pale brownish, sometimes quite dusk^- 



