216 Dr. R. B. Sharpe on the 



pp. 234, 252, pi. xxxi. (1876) ; id. Cat. B. Brit. Mus. xxv. 

 p. 413 (1896). 



This species was discovered by Dr. Giglioli on South 

 Trinidad during the voyage of the * Magenta/ and the type 

 was figured by Mr. Salvin in Rowley's ' Ornithological 

 Miscellany' (vol. i. p. 252, pi. xxxi.), but the tarsi and base 

 of the toes are coloured yellow in the plate, and do not 

 agree with the original description of Dr. Giglioli and Count 

 Salvadori, which reads as follows : — " Tarsis carneis, digitis 

 ac membrana interdigitali nigris, excepta parte basali inter- 

 media tarso concolori." 



The Earl of Crawford procured a specimen of a Petrel on 

 South Trinidad on the 20th of August, 1874, which was iden- 

 tified by Mr. Salvin as (E. armiwjoniana in the 'Catalogue of 

 Birds' (l.c .), and apparently quite correctly ; but I find, to my 

 great surprise, that it is not of the same species as the white- 

 and grey-breasted Petrels which the officers of the ' Discovery ' 

 obtained, though the tarsi and toes are the same in colour. 

 These are much darker birds, blacker above, and with a 

 notably larger bill, and I believe them to belong to an 

 undescribed species, which I have named in honour of the 

 indefatigable young naturalist on the ' Discovery/ 



4. (EsTRELATA WILSONI. 



CEstrelata wilsoni, Sharpe, Bull. B. O. C. xii. p. 49 (Feb. 

 1902). 



? . Similis (E. armmjoniancp., sed nigricantior et rostro 



crassiore distinguenda ; rostro nigro ; tarsi et digitis 



palmatis basin versus carneis, terminaliter nigris ; iride 



saturate brunnea. Long, tota circa 12*5 poll., culm. 1*1, 



alse ll'l, caudse 4 - 5, tarsi 1*3, dig. med. c. ungue 1*9. 



This Petrel has, in my opinion, a light and a dark phase. 



The latter is dark leaden-grey, and Dr. Wilson, as will be 



seen above (p. 213), considers this to be the immature and 



the white-breasted form the adult bird. As, however, both 



white- and grey-breasted birds have been found sitting on 



eggs, it is evident that they are adult ; and I believe that the 



species is dimorphic, and has a white and a grey phase of 



