2. PROCELLARIA TETHYS, Bp. 



(GALAPAGOS STORM-PETREL.) 



(Plate 2.) 



Procellaria tethys, Bp., J.f.O. 1853, p. 47 ; Salvin, Tr. Z. S., IX., p. 507, pi. 88, fig. 2 

 (1876) ; id., Cat. Birds Brit. Mus., XXV., p. 346 (1896) ; Rothsch. and Hartert, 

 Nov. Zool., VI., p. 199 (1899) ; id., Nov. Zool., IX., p. 416 (1902) ; Godman, 

 Biol. Centr.-Amer., Aves, III., p. 427 (1904). 



P. pelagicce similis, sed tectricibus alarum majoribus cinerascenti-brunneis, albo 

 marginatis, plagam pallidam exhibentibus : sub-alaribus fuliginosis, haud albo 

 variegatis : supracaudalibus albis, minime nigro terminatis, scapis tamen nigri- 

 cantibus, distinguenda. 



This species is allied to the common Storm-Petrel, but may at once be distinguished 

 by the entirely white upper tail-coverts, which are not tipped with black, as in P. 

 pelagica. The greater wing-coverts have no white margins, but are ashy-brown, thus 

 forming a patch, while the under tail-coverts are uniformly sooty-brown, without any 

 admixture of white. 



This little Petrel is plentiful throughout the Galapagos, but appears to be more 

 abundant in the south of that archipelago, and is frequently encountered far out at 

 sea. The Hon. Walter Rothschild and Dr. Hartert record that the Webster-Harris 

 Expedition procured specimens near Wenman, Culpepper, Albemarle, and Tower 

 Islands, and the species was also met with by Mr. Beck, on Bindloe and N. Albemarle 

 Islands, and at sea in Lat. 1° N., Long. 39° W. Dr. C. H. Townsend has also recorded 

 its occurrence in Lat. 40° 22' N, Long. 82° 33' W., about 400-600 miles east of 

 the Galapagos Islands (Pr. U.S. Nat. Mus., XIII. , p. 142). 



Salvin (Cat. Birds Brit. Mus., XXV., p. 344) has given the range of P. tethys as 

 extending to the west coast of Central America, for which reason I included it in the 

 " Biologia," but I have not discovered the grounds for this record (cf. Biol. Centr.- 

 Amer., Aves, III., p. 427). 



The nesting-place of the species is at present unknown, but it is doubtless in some 

 of the islands of the Galapagos Archipelago, for Mr. Beck saw the birds in thousands 



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