26 LAND-BIRDS AND GAME-BIRDS 



North American birds. The Natatores include various sea- 

 birds, the swans, geese, ducks, terns, gulls, pelicafhs, petrels, 

 and cormorants, and form about one-fourth of our fauna. The 

 Insessores include all the typical land-birds, 377 of the 635 

 North American species admitted in Dr. Coues check-list, and 

 more than one-half of about 300 species, known to have oc- 

 curred in Massachusetts. In this volume I have, with the 

 exception of the game-birds, treated the typical land-birds 

 only. The Insessores contain five orders, described in the 

 following chapters. 



