ALCID.E — THE AUKS — ITJA. 



477 



a. Lomvia. Wing, 7.45-8.80 inches (average, s.24) ; culmen, 1.40-1.50 (1.45) ; gonys, 



.75-.90 (.S:i) ; depth of bill through angle, .52-.58 (.55); tarsus, 1.40-1.55 (1.45); 



middle toe, 1.65-1.75 (1.70). Hub. North Atlantic, south to New Jersey ; Arctic 



Ocean. 

 ji. Arm. Wing, 8.15-9.25 inches (average, 8.71) ; culmen, 1.45-1.75 (1.65) ; gonys, .85- 



1.00 (.9:2) ; depth of bill through angle, .55-00 (.58) ; tarsus, 1.45-1.60 (1.51) ; middle 



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



Uria troile. 



THE COMMON GUILLEMOT. 



U. troile. (summ<r and' winter plumages), 



Colymbus troile, Linn. Faun. Suee. ed. 1761, 52 ; S. N". I. 1766, 220. 



Uriatroih, Lath. hid. Orn. II. 1790, 79(5, no. 1. — De Kay, N. Y. Zool. II. 1S44, Birds, 279. 



CcUarractes trnille, Bryant, Pr. Boston Soc. 1861, 6, li;,'. 2 c 



Uria (Lomvia) troile, Brandt, Bull. Ac St. Petersb. II. 1S37, 315. 



Lomvia troile, Coves, Pr. Ac. Nat. Sci. Philad. 1868, 75; Key, 1S72, 346; Check List, 1*73, no. 



634 ; ed. 2, 1882, no. 874. — Rmow. Norn. N. Am. B. 1881, no. 763. 

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



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

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



?' Uria ringvia, Brunn. Orn. Bor. 1764. p. 28. no. 111. — Baird, Cat. N. Am. B. 1S5S, no. 730. 

 tUria (Lomvia) ringvia, Brandt, Bull. A.-. 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). 

 ? Catarractes 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. 



