ALClDiE — THE AUKS — UllIA. 



47 



I I 



Lomvia. Wing, 7.45-8.80 inches (average, 8.24) ; culincn, 1.40-1.. 50 (1.4.5) ; gony-, 

 .75-.9() (.83) ; depth of hill thiougli angle, .52-.58 (.5.5) ; tarsuH, 1.40-1..55 (1.4.5) ; 

 middle toe, l.G.5-1.75 (1.70). I/uh. North Atlantic, .south to New .Jersey ; Arctic 

 Ocean. 



Arra. Wing, 8.15-9.25 inches (average, 8.71) ; cnlnien, 1.45-1.75 (1.05) ; gonys, .8.5- 

 1.00 (.92) ; depth of hill through angle, .5.5-.GO (.58) ; tarsus, 1.45-1. 0<^ (1-'>1) ; middle 

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



Uria troile. 



THE COMMON GUILLEMOT. 



U. troile {summer and winter plumages). 



Colymhus troile, Linn. Faun. Succ. od. 1761, 52 ; S. N. I. 1766, 220. 



Urin troile, Latu. Ind. Orn. 11. 1790, 796, no. 1. -De Kay, N. Y. Zool. II. 1844, Binl- 279. 



Calarractcs troille, Buyant, Pr. Boston See. 1861, 6, fig. 2n. 



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



Lomvia troile, Coubs, Pr. Ac. Nat. Sci. Philad. 1868, 75 ; Key, 1872, 346 ; Chock List, 1S73, no. 



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

 Uria lom.via, Biiitnn. Orn. Bor. 1764, 27, no. 108. — Cass, in Baird's B. N. Am. 1858, 913. — Baiud, 



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

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



?i Uriaringvia, Br{;nx. Orn. Bor. 1764, p. 28, no. 111. — Batud, Cat. X. Am. B. 1S5S, no. 730. 

 t 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). 

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

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



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



