542 PKOCELLABIID^ 



Adult winter, male and female. Similar to the nuptial 

 plumage. 



Immature, male and female. Resembles the nuptial 

 plumage. 



Nestling. " The nestling being covered with long greyish- 

 brown down, resembles a small long-haired mouse rather 

 than a bird, as neither the wings nor the bill are visible" 

 (Saunders). 



BEAK. Black. 



FEET. Brownish-black. 



IRIDES. Dark brown. 



AVERAGE MEASUREMENTS. 



TOTAL LENGTH ... ... ... 8*5 in. 



WING 6 



BEAK ... 0'75 ,, 



TARSO-METATABSUS 0"9 ,, 



EGG ... 1*3 x '9 in. 



MADEIRAN FORKED-TAILED PETREL. Occanodroma castro 



(Harcourt). 



Coloured Figures. Dresser, 'Birds of Europe,' vol. ix, pi. 718 ; 

 Lilford, ' Coloured Figures,' vol. vi, pi. 55. 



There is but one British specimen of this Southern 

 Petrel on record, namely a bird picked up dead on the 

 strand at Littlestone, in Kent, on December 5th, 1895. It 

 is in the possession of Mr. Boyd Alexander, who examined it 

 in the flesh. This specimen was exhibited before a meet- 

 ing of the British Ornithologists' Club on April 29th, 1896 

 (Saunders, Man. Brit. Birds, 2nd Edit., p. 731 ; also ' Ibis,' 

 1896, p. 401). 



DESCRIPTIVE CHARACTERS. 



PLUMAGE. Adult male nuptial. This species may be 

 distinguished from Leach's Petrel, which it resembles in 

 colour, by its tail, winch is much less forked ; longer upper 

 tail-coverts, white, broadly edged with black ; tail-feathers 

 (except the central pair), black, with white bases. 



Adult female nuptial. Similar in plumage to the male. 



