152 PROCEEDINGS OF THE ACADEMY OF 



States Wilkes' Exploring Expedition collection ; and is, therefore, in all 

 probability, the very individual upon which Mr. Peale based his description 

 of gularis ; which name should, therefore, stand for the species, in the event 

 of its proving valid ; even though Peale's description does not notice the 

 peculiar markings of the primaries. 



Bibliography. It is possible that the P. melanopus of Gmelin and Latham 

 was based upon this species. Their bird evidently was an JEstrela/a, and 

 "thirteen inches long;'' and the description of the colors would apply pretty 

 well to an immature mollis. But mollis has a bill by no means an inch and a 

 half long ; and is not found, so far as we know, " circa Americani septen- 

 trionalis." The only known North American species of ^Eslrelata is the 

 hcesitata ; of which the bill is nearly of the length stated by Latham. Under 

 the circumstances, I do not think this name is to be adopted for ei her species. 



I think there can be no doubt that the inexpectata of Forster is really this 

 species. I find no points of the description, nor any of the measurements, at 

 all incompatible with this supposition. Dr. Lichtenstein refers inexpectata to 

 grisea of Gmelin ; certainly incorrectly, whatever may be its relations to 

 grisea of Kuhl. 



The name mollis Gould bears the same date of publication as inexpectata, 

 (1844) : so that it is difficult to say which actually has priority. I think, if 

 any choice is allowed us, we should, by all means, use mollis, so definitely 

 characterized and well known. Mr. Gould, in describing the species, says 

 that it had been identified with lugens of Banks, and with grisea of Kuhl (nee 

 Gm.) This may very possibly be the case ; although, for the present, I give 

 grisea Kuhl, (of which lugens Banks is a synonym,) as a distinct species, 

 for reasons stated elsewhere. 



In the Ibis, as above, Mr. G. R. Gray has a species P. Phillipii from Norfolk 

 Island; based upon the "Norfolk Island Petrel," Phill. Hot. Bay, p. 161 ; 

 with P. alba, var. Lath., and P. mollis Gould, as synonyms, the latter queried. 

 No description is given, and I merely follow Gray himself, in placing the 

 name as a queried synonym of mollis. Vieillot, (Nouv. Diet., xxvi. 1S17, p. 

 420,) refers to this same "Norfolk Island Petrel." 



^E-trelata Cookii (Gray) Coues. 



Procellaria Cookii, G. R. Gray, Fn. N. Z. App. Dieff. Trav., 1843, ii. p. 199. 

 Id. Voy. Ereb. and Terror, pt. iii. 1844, pi. 35. Id. Sclater's Ibis, 

 1862, iv. p. 246. Cassin, U. S. Expl. Exped. Ornith., 1858, p. 414, and 

 of authors. 



Rhantistes Cookii, Bonap. Compt. Rend. xlii. p. 768. 



Procellaria leucopterOj Gould, P. Z. S. xxii. 1844, p. 57. Id. Ann. Mag. N. 

 H. xdi. 1844, p. 364. Id. Birds Aust. pi. 51. 



Cookilaria leucoptera, Bonap. C. A. 1855, ii. p. 190. 



Cookilaria velox, Bonap. C. A., 1855, ii. p. 190, ex Pr. velox of Solauder. Not 

 velox of Banks, supposed to be one of the Prionem. 



Rhantistes velox, Bonaparte, Compt. Rend. xlii. 1S56, p. 768. 



Procellaria brevipes,* Peale, Zool. U. S. Ex. Ex. Bds., 1848, p. 294. 

 Habitat. Southern Oceans, at large. 

 Form.] Bill much compressed, except at the extreme base, where it is 



nearly as wide as high ; much shorter than the skull ; about equal to the 



tar- us ; one of the most slender in general shape of this genus. The lateral 



superior sulcus is nearly straight, being only a little sinuate ; the outline of 



the inferior mandibular rami and of the gonys both a little concave, the pro- 



* Peale, us above. "Head an J wings Booty black; tail and back gray; throat, breast, and 

 belly white, tinged with salmon color when living; interrupted plumbeous bind across the 

 beast; two outer tail feathers li^ht gray, white beneath; shafts white; all the others brown ; 

 under wing coverts white; lesser ones nearly black. IJill black; feet )>;ile flesh; toes black at 

 their ends. Length 1070: extent 2125; culinen nineteen-tweiitieths ; middle toe and claw 1.30." 



tFrom specs in Philada. Acad, and Mus. Smithson. 



[May, 



