S2 KNOWING BIRDS THROUGH STORIES 



Key to the Families of Longipennes 



Rynchopid.« — Skimmers. 



With the lower mandible much longer than the upper. 

 Larid^ — Gulls and Terns. 



With the lower mandible not longer than the upper, and with the upper 



mandible in one piece. 

 Stercorariid.« — Jaegers. 



With the upper mandible composed of three pieces, one a saddle-like 



basal portion. 



Key to the Families of Tubinares 



DiOMEDEiD-E — Albatrosses. 



With the nasal tubes separated and situated on sides of the upper 



mandible. 

 PRocELLARiiDiE — Pctrels and Shearwaters. 



With the nasal tubes united and situated on the top of the basal 



portion of the upper mandible. 



