FAM. LX. TEENS AND GULLS 



331 



Length, 24; wing, 16 (15-17); tail, 6|; tarsus, 2J ; oulmen. If. 

 Atlantic coast of North America, south in winter to Massachusetts. 



18. Great Black-backed Gull (47. Lhrus marinus). — -Avery 

 large, very shy, black-mantled, wliite gull, with white tips to 

 all the wing quills. 



The head and neck 

 are streaked with 

 grayish in winter. 

 The young is much 

 mottled with black, 

 browns, buiis, and 

 white. (Saddle-back.) 



Length, 30 ; wing, 18J 

 (17J-19J) ; tail, 8; tarsus, 3 ; oulmen, 2\. 'North Atlantic; breeding in 

 America from the Bay of Futidy northward, and south in winter to Long 

 Island, and sometimes farther. 



19. American Herring Gull (61°. Lhrus argentMus smitJisdni- 

 anus). — A very common, large gull, with dark pearl-gray man- 

 tle, and the head, tail, and lower parts white. The ends of the 



outer primaries are 

 mainly black, but 

 with round white 

 spots near their 

 tips. The adult in 

 winter has grayish 

 streaks on head and 

 neck. The young is 

 much mottled, ashy, 

 black and buff. 

 This gull is less ex- 

 clusively marine 

 than most others, as 

 it is found on rivers 

 and in harbors. It 

 shows but little fear 



American Herring Gnll °f ^^^- 



