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- 
derparts, white; sides of breast, tinged with gray; middle 
toe and claw, less than 2 inches long. 
ea Pufinus auduboni. Audubon’s Shearwater, 
We See No. 62. 
The Manx Shearwater, Pufinus pufiinus, a European 
species, somewhat resembles Audubon’s Shearwater, but it 
is larger, the back darker, the wing rarety, 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. 
Pufinus major. Greater Shearwater. 
See No. 60. 
Under tail coverts, gray; upper tail coverts, sooty; breast, gray. 
Pufiinus fuliginosus. Sooty Shearwater. 
See No. 63. 
Upper and under tail coverts, white. _Hstrelata 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 glacialis, 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. Pufinus major. Greater Shearwater. 
See No. 60. 
Upper surface of tail feathers, dark slaty brown; under tail ecoverts, white, sometimes 
slightly mottled with grayish. Pufiinus 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). 
, and races. Fulmar Petrel. 
See Nos. 57 and 58. 
Fulmarus glacialis 
* Group 6. Wing, 15 to 17 inches long. 
Upper surface of tail feathers, dark slaty brown; under tail coverts, ash gray, or 
brownish gray. Pufinus major. Greater Shearwater. 
See No. 60. 
Upper surface of tail feathers, dark slaty brown; under tail coverts, white; sometimes 
slightly mottled with grayish. Pufiinus borealis. Cory’s Shearwater. 
See No. 59. 
* For directions for measurement, see page 9. 
