:io-4 



PROCELLARIIDJ];. 



if the members of this genus are capable of being grouped in different 

 sections, as would seem to be the case, I should certainly place CE. magenta 

 in a different section from CE. rostrata. 



(ESTRELATA ARMINJONIANA. PL XXXI, 



yEstrelata arminjoniana, Gigl. & Salvad. Ibis, 1869, p. 62 ; iid. Atti Soc. Ital. Sc. Nat. xi. 

 p. 452 ; Gigl. Distr. Faun. Vertebr. nell' Oceano, p. 42. 



CE. supra fusco-nigra, plumis totis pallide fere griseo colore marginatis, in fronte magis conspieue ; 

 gula alba, plumis anguste gTiseo-fusco marginatis ; pectore abdomineque pure albis ; torque 

 jugulari, lateribus, axillai'ibus tectricibusque alarum inferioribus nigro-fuscis ; subcaudalibus 

 mediis albis, lateralibus cinereo-nigris apicibus albicantibus ac minutissime albido variegatis, 

 scapis nigris ; remigibus nigro-fuscis, intus basi albicantibus ; rectricibus nigro-fuscis ; rostro 

 nigro ; tarsis carneis, digitis ac membrana interdigitali nigris, excepta parte basali interna 

 tarso concolori; iride brunnea : long. tot. 13'0, alse 11'2, caudse 4'75, rostr. a fronte 1"12, a 

 rictu 1"63, tarsi I'S, dig. med. cum ung. 1'83. 



Hab. in Insula Trinitatis, Oceano Atlantico meridionali {Giglioli). 



Dr. Giglioli found this species pretty common near Trinidad Island, in 

 the South Atlantic, in about lat. 20° S., on the 23rd of January, 1868, when 

 two specimens were prepared. 



The specimen described as adult is that depicted on the left hand in 

 the Plate ; the second, supposed to be a younger example, is that figured on 

 the right hand. This latter bird is described as having the sides of the head 

 whitish, the white of the basal portion of the feathers showing itself; the 

 gular collar is not so well developed ; and the lower series of the under wing- 

 coverts, together with the basal portion of the remiges, are decided white. 



The age of these specimens, as shown by their plumage, is, I think, a 

 point upon which we are at present not able to speak with certainty. For 

 my own part I am disposed to think that the plumage furnishes no evidence 

 whatever of age, as will be seen from what I have said concerning the next 

 supposed species (CEJ. trinitatis). 



