574 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Adult male-—Wing, 300-321 (311.6); tail, 119-132 (125.4); exposed 
culmen, 28-31.5 (29.4); tarsus, 28-32.5 (80.1); middle toe, 38-41 
(39.3).¢ : 
Adult female.—Wing, 304-325 (312.9); tail, 114-132.5 (125.7); 
exposed culmen, 29-30.5 (29.7); tarsus, 29-30.5 (29.8); middle toe, 
36.5-42 (39.3).° 
Breeding on Pribilof Islands, western Aleutian (Nearer) Islands, 
Alaska, and Commander Islands, Kamchatka; occurring also on 
Otter Island (June 12-14, 1885) and St. Matthew Island, Bering Sea; 
occasional or casual at St. Michaels, Alaska (1 specimen, Sept. 18, 
1876), and accidental in Yukon Territory (Forty Mile, Oct. 12, 1899); 
winter range unknown. 
Larus brachyrhynchus (not of Richardson, 1831) Gouxp, Proc. Zool. Soc. Lond., 
1843 (pub. Dec., 1843), 106 (‘‘Russian America”); Zool. Voy. ‘Sulphur,’ 1844, 
50, pl. 34.—Finscu, Abh. Nat. Ver. Brem., iii, 1872, 84 (Sitka, Alaska). 
R{tssa] brachyrhyncha BonararteE, Consp. Av., li, 1857, 226. 
Rissa brachyrhyncha Cougs, Proc. Ac. Nat. Sci. Phila., 1862, 306 (monogr.) 
[ Rissa] brachyrhyncha Gray, Hand-list, iii, 1871, 117, no. 11018. 
Rissa nivea (not Larus niveus Pallas) Gray, List Birds Brit. Mus., Anseres, 1844, 
174.—ReicHENBAcH, Novit. Natat., 1850, pl. 269, fig. 2254.—LawreEnce, in 
Baird, Rep. Pacific R. R. Surv., ix, 1858, 855.—Barrp, Cat. N. Am. Birds, 
1859, no. 675.—Exuiot, New and Unfig. N. Am. Birds, pt. ii, 1868 (vol. ii), 
pl. 53, right-hand fig., and text. 
R [issa] nivea Gray, Gen. Birds, iii, 1846, 655. 
[Rissa] nivea Bonararte, Compt. Rend., xlii, 1856, 771. 
[Rissa] niveus Brucn, Journ. fiir Orn., 1855, 285 (monogr.). 
[Larus] brevirostris Brucu, Journ. fiir Orn., 1853, 103 (northwestern America).— 
Covzs, Key N. Ams Birds, 1872, 315. 
Larus brevirostris Cours, Check List, 1873, no. 353; in Elliott’s Affairs in Alaska, 
1875, 199.—Exiotr, Monogr. Pribylov Group, 1882, 133 (breeding; habits). 
Larus (Rissa) brevirostris Brucs, Journ. ftir Orn., 1853, 285.—Covgs, Birds North- 
west, 1874, 646. : 
[Rissa] brevirostris Brucu, Journ. fiir. Orn., 1855, 285.—SuHarpe, Hand-list, i, 
1899, 143.—Forszs and Rosinson, Bull. Liverp. Mus., ii, no. 2, 1899, 58. 
Rissa brevirostris LawRENCE, in Baird, Rep. Pacific R. R. Surv., ix, 1858, 855.— 
Barrp, Cat. N. Am. Birds, 1859, no. 674.—Dauu and Bannister, Trans. 
Chicago Ac. Sci., i, 1869, 305 (St. George Island, Pribilof group).—Finscu, 
Abh. Nat. Ver. Brem., iii, 1872, 85 (n. w. coast of America).—SAaUNDERS, 
Proc. Zool. Soc. Lond., 1878, 164 (monogr.); Journ. Linn. Soc., xiv, 1878, 394 
(range); Cat. Birds Brit. Mus., xxv, 1896, 312.—Ripeway, Proc. U. 8. Nat. 
Mus., iii, 1880, 206 (Cat. N. Am. Birds, no. 659); Nom. N. Am. Birds, 1881, 
no. 659.—Covss, Check List, 2d ed., 1882, no. 784.—Nexson, Cruise ‘Cor- 
win’ in 1881 (1883), 105 (Aleutian and Pribilof Islands; St. Matthew Island); 
Rep. N. H. Coll. Alaska, 1887, 50 (habits).—Barrp, Brewer, and Rineway, 
Water Birds N. Am., ii, 1884, 207.—Stzynecer, Proc. U. 8. Nat. Mus., vi, 
1883, 60 (Bering Island); Auk, i, 1884, 358 (not occuring on Okotsk Sea); Bull. 
U.S. Nat. Mus., no. 29, 1885, 82 (Commander Islands, Kamchatka, breeding).— 
Turner, Auk, ii, 1885, 158 (Attu Island, Aleutians, breeding); Contr. N. H. 
@ Ten specimens. 5 Nine specimens. 
