736 MR. O. SALVIN ON THE PROCELLARIID.E [Jtme 18, 



stomachs were filled with a yellow oil, and mixed with it some pieces 

 of Crustacea." 



I am strongly disposed to add to the above synonyms Thalassi- 

 droma gracilis, Elliot, Ibis, 1859, p. 391, and T. segethi, Phil. & 

 Landb. Arch. f. Naturg. 1860, p. 282, names admitted by many 

 authors to apply both of them to a species found on the Chilian coast. 

 I have seen specimens of the present species in the Paris Museum 

 from the same locality ; and the Challenger specimens now before 

 me were obtained at sea at no great distance from the same shore ; so 

 that on geographical grounds their identity is a reasonable supposi- 

 tion. The chief, if not the only discrepancy I can find between the 

 description of F. gracilis and F. grallaria is one of dimensions, the 

 former being considerably smaller (as shown by Mr. Elliot's measure- 

 ments) than the 'Challenger' birds. Thus we have : — 



Wing. Tarsus. Tail, 



in. in. in. 



F. gracilis 5'22 2-40 1-20 



F. grallaria ... . 5-9-6-3 2-9-3-0 L'3-1'4 



T. segethi seems to be intermediate in dimensions ; but so far as 

 the description goes, its identity with F. grallaria is obvious. 



Mr. Sharpe (Zool. Kerg., Aves, p. 31) suggests that P. leuco- 

 gastra may prove to be a stage of plumage of P. melanog aster ; but 

 I cannot think that this will ever turn out to be the case. 



Fregetta melanogastra. 



Thalassidroma melanogastra, Gould, Ann. & Mag. N. H. xiii. 

 p. 367, et B. Austr. vii. pi. 62. 



a. Betsy Cove, Kerguelen. 



Mr. Sharpe (Zool. Kerg., Aves, p. 30) unites T. tropica, Gould, 

 with this bird, and calls it by the last-mentioned name. They may 

 be identical ; but in any case the adoption of the name tropica in 

 place of melanogastra cannot be justified, as the latter, having been 

 in use for over thirty years, ought not to be supplanted by the 

 former, the two having been published simultaneously on opposite 

 pages of the same publication ! 



Pelagodroma marina. 



Procellaria marina, Lath. Iud. Orn. p. 410. 

 Pelagodroma marina, Salv. Orn. Misc. ii. p. 228. 

 a-c. Nightingale Island. 



" Eyes black ; a night-bird. These were taken out of holes in the 

 ground during the day by help of the dogs." 



Thalassoeca glacialoides. 



Procellaria glacialoides, Smith, 111. Zool. S. Afr. pi. 51. 

 Thalassoeca glacialoides, Coues, Pr. Ac. Phil. 1866, p. 30. 

 a. Male. Ice Barrier. 

 "Obtained on the 26th Februarv, 18/4." 



