48 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



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



Upper parts, dark sooty brovvu or grayisli black ; iin- 

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

 toe and claw, less than 2 inches long. 



y'' Fu^nus auduhoni. Audubon's Shearwater. 



' - ."■ ■ \^'' ' See No. 62. 



The Manx Shearwater, Puffinus puffinus^ 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, gray or brownish gray ; breast, white. 



Fuffinus major. Greater Shearwater. 

 See No. 60. 

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



Piiffiun^fnli(/iiiof<us. Sooty Shearwater. 

 See No. 6.3. 

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



See No. 64. 

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

 color (dark phase). Fulmarus cjlacialis, 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 gray or brownish 

 gray. Fuffimis major. Greater Shearwater. 



See No. 60. 

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

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



See No. 59. 

 Upper surface of tail feathers, pale pearl gray; upper tail coverts, pearl gray; under tail 

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



Fulmarus glacialis, and races. 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. Fuffinus major. Greater Shearwater. 



See No. 60. 

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

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



See No. 59. 



* For directions for measurement, see page 9. 



