48 KEY TO THE BIRDS OF EASTERN NORTH AMERICA; 



* Group 3, Wing, 6.50 to 9.50 inches long. 



Upper parts, dark sooty brown or grayish black ; un- 

 clerparts, white; sides of breast, tinged with gray; middle 

 toe and claw, less than 2 inches long. 



Ficffiniis auduboni. Audubon's Shearwater. 



See No. G2. 

 The Manx Shearwater, Pxffinus jniffinvs, a European 

 species, somewhat resembles Audubon's Shearwater, but it 

 • / is larger, the back darker, the wing rarely, if ever, measur- 



ing less than 8.40 inches, and the middle toe and claw 2 inches or more. It is of accidental 

 occurrence on our coast. 



* Group 4. Wing, 11 to 13 inches long. 



Upper and under tail coverts, giay or brownish gray ; breast, white. 



Fiiffitms major. Greater Shearwater. 

 See No. GO. 

 Under tail coverts, gray; upper tail coverts, sooty; breast, gray. 



rnffinnsfttlit/hiosHs. Sooty Shearwater. 

 See No. 03. 



Upper and under tail coverts, white. ^strelata hasitata. Black=capped Petrel. 



See No. 64. 



Upper tail coverts, pearl gray; under tail coverts, white, or entire plumage, dark slate 

 color (dark phase). Fulmarus (jlacialis, and races. Fulmar Petrel. 



See Nos. 57 and 58. 



* 



Group 5. Wing, 13 to 15 inches long. 



Upper surface of tail feathers, dark slaty brown ; under tail coverts, ash grav or brownish 

 gray. Pitffimis major. Greater Shearwater. 



See No. (iO. 

 Upper surface of tail feathers, dark slaty brown; under tail coverts, white, sometimes 

 slightly mottled with grayish. Paffinus borealis. Cory's Shearwater. 



See No. 5!). 

 I'pper surface of tail feathers, pale pearl gray; upper tail coverts, pearl grav; under tail 

 coverts, white ; or entire plumage, dark slate color (dark phase). 



Fidmar^is glacialis, and 7-aces. Fulmar Petrel. 

 See Nos. 57 and 58. 



* Group 6. Wing, 15 to 17 inches long. 



Upper surface of tail feathers, dark slaty brown; under tail coverts, ash gray, or 

 brownish gray, Fnffinus major. Greater Shearwater. 



See \(). 60. 

 Upper surface of tail feathers, dark slaty brown; under tail coverts, white; sometimes 

 slightly mottled with grayish. Ftiffinus borealis. Cory's Shearwater. 



See No. 59. 



* For cliructionti U>r ineaeurcment, see page 9. 



