46 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



FAMILY DIOMEDEID/E. 



Albatrosses. 



Very large wing, over 19 inches long; upper mandible, curved near 

 tip, torming a hook, the end (unguis) enlarged; nostrils, separate and 

 tubular; hind toe, rudimentary, often apparently wanting. 



* Group 1. Wing, 17 to 21 inches long 



Bill, dark; the toj) fonlmen), yellow. A very large 

 ea bird. 

 Thalnssoi/eroH rnhnindtv.t. Yellow nosed Albatross. 



^ ^,''\ yj See No. 56. 



FAMILY PROCELLARIID^. 

 Shearwaters, Petrels, and Fulmars. 



Nostrils, tubular, united in one double=barrelled tube; front toes, pal^ 

 mate (full webbed); hind toe, very small, and in some cases entirely 

 absent; upper mandible, curved near tip; wing, less than 19 inches long. 



* Group 1. Wing, less than 5.50 inches long. 



General plumage, sooty black, the imderparts with faint 

 brownish tinge; upper tail coverts, white, some of them tipped 

 with black. rrocellaria pelariira. Stormy Petrel. 



See No. 67. 



* Group 2. Wing, 5.50 to 6.50 inches long. 



Tail, nearly square; upper tail coverts, white, not tipped with black; undt'ri)arts, dull 

 black; tarsus, over 1.05. Oceanites oceanicus. Wilson's Petrel. 



See No. 69. 

 Tail, decidedly forked; upper tail coverts, white, not tipped with black; underparts, 

 brownish black or sooty brown; tarsus, less than 1.05. 



Oceanodroma leucorhoa. Leach's Petrel. 

 See No. 68. 

 Underparts, white. Pelagodroma marina. White=faced Petrel. 



See No. 71. 



For directions for measurement, pee page 9. 



