672 Mr. M. J. Nicoll on the Birds collected and 



phase sitting at all. The dark phase of this bird is very- 

 variable, and the specimens obtained were of every variety, 

 from a dark-breasted bird nearly as dark as (E. trinitatis, 

 up to a bird with an almost white breast, having only the 

 extreme tips of the feathers grey. The darkest examples 

 had the tarsus almost black, as in (E. trinitatis, the blackness 

 of the toes and webs being only just distinguishable. These 

 darker-legged dark-breasted birds may be in the immature 

 stage of plumage, as the dark form is the more abundant. 

 1 several times heard these Petrels make a bubbling sound 

 .somewhat resembling that of a female Cuckoo, as described 

 by Dr. Wilson (Ibis, 1904, p. 212). 



OESTRELATA TRINITATIS Grigl. & Salvad. 



(Estrelata trinitatis Gigl. & Salvad. Ibis, 1869, p. 65. 



CEstrelata trinitatis Salv. Cat. B. B. M. xxv. p. 413 ; 

 Nicoll, Bull. B. O. C. xvi. p. 103. 



Two adult males, one young male in down, one adult in 

 spirit, and one skeleton. 



This Petrel was not nearly so abundant as the former, 

 and was only met with at some distance up the hill-side. At 

 the time of our visit it had large downy young in similar 

 situations on the rocks to those above mentioned. This 

 species is, I think, distinct from the dark phase of (E. wilsoni. 

 All the examples that I saw and obtained were of a uniform 

 chocolate-browm, with black bills and black tarsi anil feet. 

 The young bird is covered with dark grey down. 



Sula piscator (Linn.). 



Sula piscator Saunders, P. Z. S. 1880, p. 163; Grant, 

 Cat. B. B. M. xxvi. p. 432. 



Sula piscatrix Sharpe, Ibis, 1904, p. 214. 



Adult males and females. Imra. male and chick. 



Bill lavender, pink at base, round eye pink ; sac pinkish, 

 base of sac bluish ; tarsi and toes cherry-red. 



This Gannet was fairly abundant at the time of our visit, 

 especially at the top of the island, 2000 feet above sea-level, 

 where there was a colony of nesting birds in some tall 



