46 



KKY TO THE BIRDS OF EASTERN NORTH AMERICA. 



FAMILY DIOMEDEID^. 



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 to),) roulnieii), yellow. A verj' large 

 sea bird. 



Thnlasso(jeron ntlmiiKitin^. Yellow = nosed Albatross. 



.See No. 5G. 



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 plmiiage, .sooty black, the uudcrpart.s with faint 

 brownish tinge; upper tail coverts, white, some of tlieni tipjx'd 

 with black. Procellaria pelagica. Stormy Petrel. 



See No. G7. 



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



Tail, nearly square; iii)iH'r tail coverts, white, not tipped with l)]ack; underparts, dull 

 black; tarsus, over 1.05. Oceanitrs ocmnirns. Wilson's Petrel. 



See No. Gi). 

 Tail, decidedly forked; uppci- tail coverts, wliite, not tii)p<'d witli black; uiiderparts, 

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



Oceanodroma Icurorhoa. Leach's Petrel. 

 See No. G8. 

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



See No. 71. 



* For directions; for moasuremcnt, pee page i). 



