152 BIEDS. 



9. STERNA, Linnseus. Common Teens. 



1. S. liirundo, Auct. Common Teen. Sea Swallow. 

 Wilson's Teen. Bill red, blackening towards tip; tail 

 mostly white; outer web of outer feather darker than 

 inner; L. 14^ (13 to 16); W. 10 (9^ to 11|); T. 6 (5 to 

 7.) Coasts of Europe and America; abundant. {^S. 

 i, Lawr.) 



2. S. forsteri, Nuttall. Foestee's Teen. Larger; 

 tail longer and wings shorter; inner web of outer tail 

 feather darker; W. 9^ to 10^; T. 6^ to 8. N. Am., 

 common. 



3. S. maorura, Naumann. Aectic Teen. Bill carmine 

 throughout; plumage as in Mrundo, but darker below; 

 L. 14 to 17; W. 10 to 12; T. 5 to 8; smaller than 

 Mrundo, but tail proportionally much longer. Northern 

 regions, S. to U. S. 



4. S. paradisea, Auct. Roseate Teen. Bill black, 

 usually orange at base below; mantle very pale; some- 

 what rosy -tinted below; L. 13 to 16; W. 9 to 10; T. 5 

 to 8. Atlantic Coast, abundant. {8. dougalli, Mont.) 



5. S. pontlandica, Ridgway. Poetland Teen. Near 

 the preceding, but mantle as in Mrundo; the rump 

 white instead of pearly; feet blackish; under parts pure 

 white; L. 12^; W. 9f; T. 5 or more. Lately discovered 

 in Maine and Mass.; but two specimens known. 



6. S. superci/iaris, (Vieill.) var. antillarum, (Lesson) 

 Coues. Least Teen. Bill yellow, usually tipped with 

 black; a white frontal crescent between cap and bill; 

 shafts of two or more oiiter primaries black above; very 

 small; L. 8 or 9; W. 6i; T. 2 to ^. U. S., chiefly 

 abundant coastwise. 



