48 KEY TO THE BIRDS OF EASTERN NORTH AJMERICA. 



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



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

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

 toe and claw, less than a inches long. 



PuJJimis auduboni. Audubon's Shearwater. 



See No. 62. 

 The Manx Shearwater, Puffinus puffimis, a European 

 species, somewhat resembles Audubon's Shearwater, but it 

 is larger, the back darker, the wing rai-ely, if ever, measur- 

 ing less than S.40 inches, and tlie 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, graj' or brownish gray; Ijreast, white. 



Puffinus major. Greater Shearwater. 

 See Xo. 60. 

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



Fuffinns fiiHijiiwsus. Sooty Shearwater. 

 See No. 63. 



Upper and under tail coverts, white. JEstrelatahasitata. Black=capped Petrel. 



See No. 64. 



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

 color (dark pliasej. Fulmarus ijlaruilis, cnid races. Fulmar Petrel. 



See Nos. 57 and 58. 



* Group 5. Wing, 13 to 15 inches long. 



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

 gray. Pvffinn.i major. Greater Shearwater. 



See No. 60. 

 Upper surface of tail feathers, darl; slaty Ijrown; under tail coverts, white, sometimes 

 slightly mottleil witli grayish. Puffinus horealis. 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 (darlc phase). 



Fnhnarus (jlacialis, 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. Puffinus major. Greater Shearwater. 



See No. 60. 

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

 slightly mottleil with grayish. Puffinus horealis. Cory's Shearwater. 



See No. 59. 



■ For directions lor ineiisureinent, see page 9. 



