42 



GULLS. 



1. GREAT BLACK-BACKED GULL, L. maeinus. 



Fig. 48. 



Large, 28.00-31.00; 

 mantle, dark slate^ 

 appearing black in 

 the distance ; prima- 

 ries, with white tips 

 and spots near ends, 

 fig. 48. Young rath- 

 ^<v^5^w er pale brownish, 

 darkest above, and 

 ?f?- streaked with buff 



/; and grayish. Downy 

 j£ . ' -- y o u n g , g r a y i s h- 

 "r^^^^ white, mottled above 

 -?^ with dusky; top of 

 F, B, c, 1. 1-10. head, spotted with 



black. Breeds from the Bay of Fundy northward in May on 

 coasts and islands of the North Atlantic ; migrates south- 

 ward in Sept. ; winters from Southern Greenland, as far south 

 as L. I. ; goes north the last of April ; occasionally a few will 

 remain as far south as Cape Ann, Mass. in summer; common. 



2. SIBERIAN GULL, L. AFFiNis. Smaller than 1 ; 20.00; 

 mantle a little paler and the feet are yellow. Northern 

 Asia; accidental in Southern Greenland. 



3. GLAUCOUS GULL, L. glaucus. About the size of 

 1 ; mantle and wings, pale pearl-gray. Young, grayish-white ; 

 brownish-gray below ; upper parts, transversely mottled with 

 pale brownish. Downy young, grayish-white, paler beneath 

 mottled and clouded above with dusky and grayish. Breeds 

 in the Arctic regions, where it is common ; south in winter 

 regularly to the Gulf of St. Lawrence, and rarely to the Great 

 Lakes and L. I. 



4. HERRING GULL, L. argentatus. 24.00; white; 

 mantle, pearl-gray; primaries, with white tips and spots near 

 ends, that on outer feather, usually extending to the tip with- 

 out being interrupted by a black cross bar, fig. 50 ; bill, yellow ; 



