MONOGRAPH OF THE PETRELS. 



a'. Upper surface almost uniformly dark from 

 the back to the tail. . 



b'. Upper surface light bluish-grey, under surface 

 white 



c'. Upper surface bluish-grey with a greater or 

 less admixture of white 



glupischa (dark phase), 

 p. 270 



glwpischa (light phase), 

 p. 270 



rodgersi, p. 273 



XIX. — Daption, Steph. 



Type 



Daption, Steph. in Shaw's Gen. Zool., XIIL, p. 239 (1826) ; 

 Bp., Consp. Av., II., p. 188 (1855); Coues, Pr. 

 Acad. Nat. Sci. Philad., 1866, p. 162; Forbes, 

 Voy. " Challenger," Zool., IV., pt. XI., p. 42 (1882) ; 

 Shufeldt, Pr. U.S. Nat. Mus., VII., p. 378 (1887) ; 

 Salvin, Cat. Birds Brit. Mus., XXV., p. 428 (1896) D. capensis 



A single species, Daption capensis (p. 276), found in all the Southern Oceans. 



XX. — Halobjena, Isid. Geoffr. 



Halobcena, Isid. Geoffr. St. Hilaire, 1830, fide Bp., Consp. 

 Av., II., p. 193 (1856) ; Coues, Pr. Acad. Nat. Sci. 

 Philad., 1866, p. 162 ; Salvin, Cat. Birds Brit. Mus., 

 XXV., p. 431 (1896) 



Zaprium, Coues, Bull. U.S. Nat. Mus., No. 2, p. 34 (1875) . . 



One species, H. ccerulea (p. 281), from the Southern Oceans. 



Type 



H. ccerulea 

 H. ccerulea 



XXI. — Prion, Lacep. 



Type 



Prion, Lacepede, Mem. l'Instit., III., p. 513 (1801) ; Bp., 

 Consp. Av., II., p. 192 (1856) ; Coues, Pr. Acad. 

 Nat. Sci. Philad., 1886, p. 167 ; Forbes, Voy. 

 " Challenger," Zool., IV., pt. XI., p. 42 (1882) ; 

 Salvin, Cat. Birds Brit. Mus., XXV., p. 432 (1896). . P. vittatus 



Pachyptila, Illiger, Prodr., p. 274 (1811) . . . . . . P. vittatus 



Priamphus, Rafinesque, Anal., p. 72 (1815) 



Pseudoprion, Coues, Pr. Acad. Nat. Sci. Philad., 1866, p. 164 P. desolatus 



