CLASSIFICATION. 

 XXIII. — Diomedea, Linn. 



Diomedea, Linn., Syst. Nat., i., p. 214 (1766) ; Bp., Consp. 

 Av., II., p. 184 (1855) ; Coues, Pr. Acad. Nat. Sci. 

 Philad., 1866, p. 175 ; Forbes, Voy. " Challenger," 

 Zool., IV., pt. XL, p. 42 (1882) ; Salvin, Cat. Birds 

 Brit. Mus., XXV., p. 440 (1896) 



Phcebetria, Reichenbach, Syst. Av., p. v. (1852) 



Type 



D. exulans 

 D. albatrus 



Thalassarche, Reichenbach, Syst. Av., p. v. (1852) ; 

 Forbes, Voy. " Challenger," Zool., IV., pt. XL, p. 57 

 (1882) . . . . . . . . D. melanophrys 



Key to the Species. 



a. Larger ; bill very strong ; interscapular region and 



middle of back white. 



a'. Head white. 



a". Upper back with narrow transverse dark 

 lines ; wing-coverts dark slaty-black, the 

 smaller coverts becoming nearly white to- 

 wards the edge of the wing ; exposed portion 

 of the primaries beneath black. Young 

 bird brown, face white . . . . . . exulans, p. 309 



o" . Upper back without transverse dark lines ; 

 longer scapulars blackish at the ends ; 

 wing-coverts dark grey irregularly mottled 

 towards the edge with white ; exposed 

 portion of primaries beneath black. Young 

 bird white, from the downy nestling . . regia, p. 319 



c". Upper back without transverse dark lines ; 

 scapulars white, faintly banded with narrow 

 dark lines ; wing-coverts nearly white, the 

 middle coverts only variegated with black ; 

 exposed portion of primaries beneath with 

 a large white patch on the inner webs . . chionoptera, p. 3 



&'. Head buff albatrus, p. 326 



b. Smaller ; bill more slender. 



c'. Interscapular region and the middle of the back 

 sooty-black or brown. 



Lin 



