46 



KEY TO THE BIKDS OF EASTERN NOKTH AMERICA. 



FAMILY DIOMEDEID/E. 



Albatrosses. 



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

 tip, lorming 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 top ('culmeii), yfllow. Avery large 

 ilea bird. 



ThulassoijeroH culminoln^. Yellow-nosed Albatross, 



See Xo. 56. 



FAMILY PROCELLARIID/E. 

 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 Idaek, the underparts witli faint 

 brownish tinge ; uj^per tail coverts, white, some of tlieni tipped 

 with black. Frocellaria pelayica. Stormy Petrel. 



.See Xo. 67. 



* 



Group 2. Wing, 5.50 to 6.50 inches long. 



Tail, nearly square; upijcr tail coverts, white, not tipped with black; underparts, dull 

 black; tarsus, over 1.05. Oreanitea oceaniruf:. Wilson's Petrel. 



See Xo. 60. 

 Tail, decidedly forked; upiier tail covert.?, white, not tipped with black; underparts, 

 brownish black oi- sooty brown ; tarsus, less than l.OS. 



Oceanodroma li-unirhna. Leach's Petrel. 

 See Xo. 68. 

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



See Xo. 71. 



* For directions lor iiieamirenient, see page 1). 



