ORNITHOLOGICAL EXPLORATIONS. 17 



Family ALOID^. 

 5. Una lomvia arra (Pall). 



182'2. — Uria irunmcJiii Choris, Voy. Pittor., A16out., pi. xxi {nee Sab.) — Blakist. & 



Pryer, Ibis, 1878, p. 2X1.— lid., Tr. As. Soc. Jap., VIII, 1880, p. IQQ.—Iid., 



ibid., X, 18H2, p. 91.— Seeb., Ibis, 1882, p. 369.— Blakist., Ameud. List B. 



Jap., p. 32. 

 1826. — Cepplms arra Pall., Zoogr. Ross. As. II, p. 347. — Uria a. Cassin, Pr. Philada. 



Acad., 1862, p. 324.— Dall & Bannist., Tr. Cliicag. Acad., I, 1869, p.309,— 



Taczan., Bull. Soc. Zool. France, 1882, p. 398.— Stfjneger, Naturen, 1884. 



p. 54.— iomria a. Coues, in Elliott's Aif. Alaska, p. 211. — Elliott, Monogr. 



Seal Isl., p. 135 (1882).— Nelson, Cruise Corwiii, p. 117 (1883). 

 1826. — Ccpphus lomvia Pall., Zoogr., Ross. As., I, p. 'Mb (pari). — Taczan., Orn. Fauu., 



Vost. Sibir., p. 74 (1877).— /d, Bull. Soc. Zool. France, 1877, p. 51. 

 1832.— ZJri'a troile Kittl., Isis, 1832, p. 1104 (nee LiN.).— M, Denkw., I, p. 302; II, p. 224 



(1858).— FiNSCH, Abh. Brem. Ver., Ill, 1872, p. 78. 

 1884. — Uria lomvia arra Ridgw. in B Br. & Ridgw. Water B. N. Amer., II, p. 485. — 



Turner, Auk, 1885, p. 159. 



Dr. Cones, in his Monog^rapli of the Alcidce, phices Cepplms lomvia of 

 Pallas, with a query as a synonym under Lomvia californica, and re- 

 marks that "it is possible that this species rather thi.u troile is alluded 

 to by Pallas under the name of CepjjJms lomvia'''' (Pr. Philada. Acad. 

 1868, pp. 79 and 80). Of the thick-billed Guillemot, from the Pribilof 

 Islands, he says: "This bird is, of course, the true arra of Pall s" 

 (Elliott's Aff. Alaska, p. 211). 



But Pallas's birds are not so easily disposed of, as an inspection of 

 his descriptions will show. It will be borne in mind that the chief dis- 

 tinction between the two Pacific forms is to be found in the bill, the one 

 having a thick, robust beak, with dilated and naked toraia at the base 

 of the upper mandible, while in the other the bill is slender, weak, and 

 feathered along the base of the maxillar edge, the latter form being 

 Bryant's californica. 



Pallas gives a comparison of the bills of the two forms, described by 

 him as lomvia and arra (Z. R. A., II, p. 347) in which he says : " Contra 

 in Lomvia Caratschatica angulus rostri frontalis obsolete canaliculatus 

 et carina sulco excavata [scr. excarata] laterales vero rostri margincs longe 

 citra nores, ad fraenum oris usque nudi; quod non in Arra. Anguli plu- 

 mosi ultra nares procurrentes, carina curvilinea, nee augulata." This de- 

 scription does not leave the slightest trace of doubt that his G. lomvia^ at 

 least as far as his Pacific specimens are concerned, is the thick-billed 

 form with the naked tomia, and, consequently, that it is not a synonym 

 of californica. This will be the more plain if we look at his description 



of the bill of his arra on the same page : " Magnitude et habitus omnino 

 158G1 Bull. 29 2 



