ALCID.E — THE AUKS — URIA. 



477 



a. Lomvia. Wing, 7.45-8.80 inches (average, 8.24) ; culnien, 1.40-1.50 (1.45) ; gonys, 



.75-.'JO (.83) ; depth of l)ill through angle, .52-.58 (.55) ; tarsus, 1.40-1.55 (1.45) ; 



middle toe, 1.65-1.75 (1.70). Hub. North Athuitic, south to New Jer.sey ; Arctic 



Ocean. 

 /3. Arm. Wing, 8.15-9.25 inches (average, 8.71) ; cuhnen, 1.45-1.75 (1.G5) ; gonys, .85- 



1.00 (.92) ; depth of liill through angle, .55-60 (.58) ; tarsus, 1.45-1.60 (1.51) ; luiddle 



toe, 1.70-1.90 (1.81). Hab. North Pacific. 



Uria troile. 



THE COMMON GUILLEMOT. 



Cohjmhus troile, LlNX. Faun. Suec. ed. 1761, 52 ; S. N. I. 1766, 220. 



Uria troile, Lath. Ind. Orn. II. 1790, 796, no. 1. -De Kay, N. Y. Zool. II. 1844, Birds, 279. 



Catarractcs troillc, Bryant, Pr. Boston Soc. 1861, 6, fig. 2 a. 



Uria {Lomvia) troile, Brandt, Bull. Ac. St. Petersh. II. 1837, 345. 



Lomvia troile, Coues, Pr. Ac. Nat. Sci. Philad. 1868, 75 ; Key, 1872, 346 ; Check List, 1873, no. 



634; ed. 2, 1882, no. 874. — Rinow. Nom. N. Am. B. 1881, no. 763. 

 Uria lomvia, BuiJNN. Orn. Bor. 1764, 27, no. 108. — Cass, in Baird's B. N. Am. 1858, 913. — Baird, 



Cat. N. Am. B. 1859, no. 729. 

 Cohjmhus minor, Gmel. S. N. I. ii. 1788, 585 (part). 



?i Uriarimfvia, Brijnn. Orn. Bor. 1764, p. 28, no. 111. — Bairu, Cat. N. Am. B. 1858, no. 730. 

 ?Uria (Lomvia) ringvia, Brandt, Bull. Ac. St. Petersb. II. 1837, 345. 

 ? Lomvia ringvia, Coues, Pr. Philad. Acad. 1868, 77. 



Uria ringvia, Cass, in Birds N. Am. 1858, 914 (description and part of specimens enumerated). 

 ? Caiarractes ringvia, Bryant, Pr. Boston Soc. 1861, 8. 

 Uria alga, Brunn. 1. c. no. 112. 



1 The names preceded by an interrogation point refer to the form known as Uria ringvia. 



