FAM. LVII. FULMARS, SHEARWATERS, ETC. 815 



waters derive their name from their habit of strongly and 

 swiftly "shearing the crests of the waves and skimming the 

 billows with marvelous eas'e and without visible motion of the 

 pinions." (Dr. Coues.) 



Key to the Species 



* Viider mandible not hool<ed at tip ; ' wing, 11-14 long 1. Fulmar. 



* Under mandible liooked at tip much like the upper,'^ or else with wings 



under 7 long. (A.) 



A. Wings, 4-7 long. (E.) 



A. Wing.s, 7-15 long. (B.) 



B. Wings, 13|-lo long ; culmen over 2 long 2. Cory's Shearwater. 



B. Wings, 11-1 3i long; culmen, U-2 long. (D.) 

 B. Culmen under 1 1 long. (C. ) 



C. Wing, 11-12 long (i. Black-capped Petrel. 



C. Wing, 7-10 long 4. Audubon's Shearwater. 



D. -Under parts dusky '>. Sooty Shearwater. 



D. Under parts white 3. Greater Shearwater. 



E. Tail forked for over a half inch -^ 8. Leach's Petrel. 



E. Tail square. (F.) 

 F. Upper tail coverts white ; nails flat and obtuse*.. 9. Wilson's Petrel. 



F. Upper tail coverts tipped with black ; nails hooked, acute ^ 



7. Stormy Petrel. 



1. Fulmar (86. Fidmarns gkicidlis). Light j^hase. — A large 

 white bird with slaty-gray mantle and nearly black wing 

 quills; the tail the 

 color of the back. 

 Dark p h ase. — A 



nearly uniform dark, ( ^^■■■kk^. "^^ '^'' 



slaty-gray bird. 

 This bird is a con- 

 stant attendant upon 

 fishermen on their 

 trips to the fishing 



banks, living upon P^^^^^ 



the offal which is 



