6 Campbell, DicJwtomous Key. 



i6. Under surface all white ; claws flattened and wide. 



Pelagodroma marina (White-faced Storm-Petrel). 

 Under surface not all white ; claws sharp . . . . . . 17 



17. Head, neck, and chest sooty-grey. 



Garrodia nereis (Grey-backed Storm-Petrel). 



Plumage sooty-black, except upper and under tail coverts, which 



are white. Oceanites oceanicus (Yellow-webbed Storm-Petrel). 



18. Length about 12 inches ; upper surface bluish ; under surface 



white ; tarsus bluish ; nasal tube short . . . . 19 



Plumage mostly uniform or not bluish and white ; tarsus flesh 

 colour or black ; nasal tube long or strong ; hook of bill 

 large . . . . . . . . . . • • 23 



19. Bill black ; first and second primary equal in length. 



Halobcena ccernlea (Blue Petrel). 

 Bill bluish ; first primary longest. Prion. Dove-Petrels. 20 



20. Bill broad ; edges of upper mandible convex . . . . 21 

 Bill narrow ; edges of upper mandible straight . . . . 22 



21. Width of bill .7 to .8 inches ; palate plates visible when bill is shut. 



P. vittatus (Broad-billed Dove-Petrel). 

 Width of bill .5 inches ; palate plates only visible near gape. 



P. banksi (Banks Dove-Petrel). 



22. Crown of head darker than back. P. desolatus (Dove-Petrel). 

 Crown of head not darker than back. P. ariel (Fairy Dove- Petrel). 



23. Length 34 inches ; plumage dark brown ; bill horn colour. 



Ossifraga gigantea (Giant Petrel). 

 Characters otherwise . . . . . . . . . . 24 



24. Length 16 inches ; back mottled black and white. 



Daption capensis (Cape Petrel). 

 Back uniform . . . . . . . . . . . . 25 



25. Both nostrils visible from above : bill black or flesh colour. 



PUFFINUS. 26 

 Nostrils united in a single opening or almost so ; nasal tube stout or 



turned upward . . . . . . . . . . 32 



26. Plumage sooty only . . . . . . . . . . 27 



Plumage sooty above, white beneath . . . . . . 30 



27. Legs and bill black ; wing 10.5 inches 



P. tcnuirostris (Short-tailed Petrel, Mutton-Bird). 

 Legs flesh colour ; bill not all black . . . . . , . . 28 



28. Tail wedge-shaped, 5 inches ; wing 11.6 inches. 



P. chlororhynchus (Wedge-tailed Petrel). 

 Tail rounded, 4 inches ; wing 12 inches . . . . . . 29 



29. Under wing coverts ashy-white with dark shafts : bill dark. 



P. griseus (Sombre Petrel). 

 Plumage sooty throughout ; liill flesh colour, except tip. 



P. cariieipes (Fleshy-footed Petrel). 



30. Tail wedge-shaped, 5.5 inches long. 



P. leucomelas (White-fronted Petrel). 

 Tail rounded, about 2.5 inches . . . . . . . . 31 



31. Total length 12 inches : under wing sooty. 



P. gavia (Forster Petrel). 



