12 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XIII. 



Order Colymbiformes. 

 Family Gavidae Loons. 



Order Sphenisciformes. 

 Family Spheniscidae Penguins. 



Order PROCELLARIIFORMES. 

 Family Procellariidae Petrels, Shearwaters, etc. 

 " Pelecanoididae Diving Petrels. 

 " Diomedeidae Albatrosses. 



Order ALCIFORMES. 

 Family Alcidae Auks and Puffins. 



Order Lariformes. 



Family Stercorariidae Jaegers and Skuas. 

 " Laridae Gulls and Terns. 

 " Rhynchopidae Skimmers. 



Order Charadriiformes. 



Suborder Chionides. 

 Family Chionidae Sheath-bills. 



Suborder Attagides. 

 Family Thincorythidae Seed Snipes. 



Suborder Charadrii. 

 Family Phalaropodidae Phalaropes. 



" Recurvirostridae Stilts and Avocets. 



" Scolopacidae Snipes and Sandpipers. 



" Charadriidae Plovers. 



" Aphrizidae Turnstones and Surf -birds. 



" Oedicnemidae Thick-knees. 



" Haematopodidae Oyster Catchers. 



Suborder Jacanae. 

 Family Jacanidae Jacanas. 



Order GRUIFORMES. 



Suborder Grues. 

 Family Gruidae Cranes. 



