TERNS. 



105 



dusky above, some of inner tail 

 / /( feathers tipped with black. 

 j Breeds in the Arctic, south in 



i* 



winter as far as Disco Bay in 



Greenland. 



Ross Gull. 



73. SABINE GULL. 



Small, 13.50; tail prominently forked, 

 white, head and upper neck dark plumbeous, 



i&. 74. 



Sabine Gull: summer adult. 1-4. 



below this a black collar; mantle, dark blue- 



