OF THE GALAPAGOS AECHIPELAGO. '507 



be attributed to age, or perhaps to the not too accurate colouring of the plate. There 

 is shown too, in the latter, a white spot near the eye, which I have not been able to 

 trace in the Museum example. 



Genus Procellaria. 

 An oceanic genus of nearly universal range. 



Procellaria tethys. (Plate LXXXVIII. fig. 2.) 

 Procellaria tethys, Bp. Notes Om. p. 92, et Consp. ii. p. 197. 



Fuliginoso-nigra : tectricibus alarum mediis et corpore subtus brunnescentioribus : 

 tectricibus subalaribus fuliginoso-brunneis, tectricibus cauda; superioribus elongatis, 

 omnino albis ; uropygio dorso concolori ; rostro et pedibus nigerrimis : long, tota 6-0, al® 

 5-2, caudae rectr. ext. 2-4, rectr. med. 2-2, tarsi 0-85, dig. med. -70, rostri a rictu -65. 



Obs. P. 2>elagic(e aflSnis, sed tectricibus caudae magis elongatis et apicibus omnino 

 albis, alarum tectricibus mediis brunnescentioribus, cauda sensim furcata, tectricibus 

 subalaribus et axillaribus omnino fuliginosis distinguenda. 



There is a specimen of this species in the British Museum, marked in Bonaparte's 

 handwriting " P. tethys, Bon.", and refeiTed to by him in the ' Conspectus.' It bears 

 the mark 193 « ; but no record of its origin or locality is extant. 



As it answers to Bonaparte's description, and agrees with the type in the Paris 

 Museum (which I have lately examined), I have no doubt it belongs to the species 

 obtained by Neboux in the Galapagos Islands. The species seems to be little known, 

 no specimen having come under Dr. Coues's observation when engaged in compiling his 

 monograph of this family. 



Mr. Gray refers this species to P.j)elagica in his 'Hand-list' (iii. p. 103), having 

 apparently overlooked the differences which distinguish it. The plate taken from the 

 British-Museum specimen, will, I trust, tend to establish Procellaria tethys in its rightful 

 position. 



Genus CEstrelata. 



This genus of Procellariidae has a wide range in both the Atlantic and Pacific Oceans, 

 the species being most numerous in the southern temperate zone. In the Atlantic a 

 single species ranges as far north as the Canaries, where (E. mollis is found. In the 

 Pacific the Galapagos Islands appear to be the limit of the northern range. The species 

 there found, which I describe below, has its nearest ally in a West-Indian Petrel which 

 has strayed to the coasts of Europe. 



CEstrelata ph^eopygia, sp. n. (Plate LXXXVIII. fig. 1.) 



Supra brunnescenti-nigra fere unicolor, dorsi plumis cinereo stricte marginatis ; fronte, 

 loris, corpore subtus, pagina alarum inferiore (nisi in margine), et crisso albis : remige 

 primo omnino nigro, remigibus reliquis in dimidio basali pogonii interni albis : rectri- 

 cibus dorso concoloribus, in pogonio interno basin versus albis ; tarsis et pedum dimidio 



