46 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
FAMILY DIOMEDEID. 
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 top (eulmen), yellow. <A very large 
sea bird. 
Thalassogeron culminatus. Yellow=-nosed Albatross. 
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 underparts with faint 
brownish tinge; upper tail coverts, white, some of them tipped 
with black. Procellaria pelagica. 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; underparts, dull 
black: tarsus, over 1.05. Oceanites oceanicus. Wilson’s Petrel. 
See No. 69. 
Vail, 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, see page 9. 
