388 BRITISH BIRDS. 



ALCA TROILE and ALCA BRUNNICHI. 

 COMMON GUILLEMOT and BRUNNICH'S GUILLEMOT. 



(Plates 43 & 44.) 



The rediscovery of Pallas's Guillemot in Japan and Behring Sea has 

 so completely bridged over the supposed interval between Brunnich's Guil- 

 lemot and the Common Guillemot that it is impossible to regard the three 

 or four forms as more than subspecifically distinct. For the sake of 

 clearness the synonymy of each of the four forms is given. 



ALLA TROILE BRUNNICHI. 



Brunnich's Guillemot. 



Alca lomvia, Linn. Si/st. Nat. i. p. 130 (1758). 



Uria svarbag, BrUnn. Orn. Bor. p. 27 (1764). 



Uria bruimichii, Sabine, Trans. Limi. Soc. xii. p. 5.38 (1818) ; et auctorum pluri- 



morvun — Temminck, Gould, Audubon, Dresser, &c. 

 Uria francsii, Leach, Trans. Linn. Soc. xii. p. 588 (1818). 

 Uria polaris, Brehm, Vog. Deutschl. p. 984 (18.31). 



Alca brunnichii (Sabine), Malmrjr. (Efv. K. Vet.-Ahad. Forh. 1863, p. 111. 

 Loni'v-ia svarbag (Brilnn.), Coues, Proc. Ac. Nat. Sci. Phi/ad. 1868, p. 80. 

 Uria lomvia (Linn), Baird, Brewer, ^- Ridgivay, Water-Birds N. Amer. ii. p. 485 



(1884). 



ALCA TROILE ARRA. 



Pallas's Guillemot. 



Cepphus arra, Pall. Zoogr. Rosso- Asiat. ii. p. 347 (1826); et auctorum pluri- 



morum — (Cassin), (Coues), &c. 

 Uria arra (Pall.), Cassin, Proc. Ac. Nat. Sci. Philad. 1864, p. 324. 

 Lomvia arra (Pall.), Ridyic. Norn. N.-Amer. B. p. 57 (1881). 

 Uria lomvia arra (Pcdl.), Baird, Brewer, ^- Ridgway, Water-Birds N. Amer. ii. p. 485 



(1884). 



ALCA TROILE. 



Common Guillemot. 



Uria uria, Briss. Orn. vi. p. 70 (17G0). 



Colymbus troile, Linn. Syst. Nat. i. p. 220 (1766) ; et auctorum plurimorum-- 



Gmelin, (Temminck), (Dresser), (Saunders), &c. 

 Uria lomvia. Scop. Ann. i. Hist. Nat. p. 78 (1769). 

 Mergus lomvia (Scop.),\ j,^^^^^ ^^.^^ ^^..^ 3 ^^^^^^ 

 Mergus lomvia mmor, I 

 Uria ringvia, Lath. Gen. Syn. Siq>pl. i. p. 295 (1787, Ringed variety, ex Briinn.). 



