574 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult male.— Wing, 300-321 (311.6); tail, 119-132 (125.4); exposed 

 culraen, 28-31.5 (29.4); tarsus, 28-32.5 (30.1); middle toe, 38-41 

 (39.3).« 



Adult female. —Wing, 304-325 (312.9); tail, 114-132.5 (125.7j; 

 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. Micliaels, Alaska (1 specimen, Sept. 18, 

 1876), and accidental in Yukon Territory (Forty Mile, Oct. 12, 1899) ; 

 winter range unknown. 



Larus brachyrkijnchus (not of Richardson, 1831) Gould, Proc. Zool. Soc. Lond., 

 3843 (pub. Dec, 1843), 106 ("Russian America"); Zool. Voy. 'Sulphur,' 1844, 

 50, pi. 34.— FiNSCH, Abh. Nat. Ver. Brem., iii, 1872, 84 (Sitka, Alaska). 



/([•jasa] brachyrhyncha Bonaparte, Consp. Av., ii, 1857, 226. 



Rissa brachyrhyncha Coues, Proc. Ac. Nat. Sci. Phila., 1862, 306 (monogr.) 



[Rissa] brachyrhyncha Gray, Hand-list, iii, 1871, 117, no. 110^8. ^ 



Rissa nivea (not Larus niveus Pallas) Gray, List Birds Brit. Mus., Anseres, 1844, 

 174. — Reichenbach, Novit. Natat., 1850, pi. 269, fig. 2254. — Lawrence, in 

 Baird, Rep. Pacific R. R. Surv., ix, 1858, 855.— Baird, Cat. N. Am. Birds, 

 1859, no. 675. — Elliot, New and Unfig. N. Am. Birds, pt. ii, 1868 (vol. ii), 

 pi. 53, right-hand fig., and text. 



R \issa\ nivea Gray, Gen. Birds, iii, 1846, 655. 



{Rissa] nivea Bonaparte, Compt. Rend., xlii, 1856, 771. 



[Rissa] niveus Bruch, Journ. fiir Orn., 1855, 285 (monogr.). 



[Larus] brevirostris Bruch, Journ. fiir Orn., 1853, 103 (northwestern America). — 

 Coues, Key N. Am. Birds, 1872, 315. 



Larus brevirostris Coues, Check List, 1873, no. 353; in Elliott's Affairs in Alaska, 

 187S, 199.— Elliott, Monogr. Pribylov Group, 1882, 133 (breeding; habits). 



Larus (Rissa) brevirostris Bruch, Journ. fiir Orn., J 853, 285. — Coues, Birds North- 

 west, 1874, 646. 



[i^issa] brevirostris Bruch, Journ. fur. Orn., 1855, 285. — Sharpe, Iland-list, i, 

 1899, 143.— Forbes and Robinson, Bull. Liverp. Mus., ii, no. 2, 1899, 58. . 



Rissa brevirostris Lawrence, in Baird, Rep. Pacific R. R. Surv;, ix, 1858, 855. — 

 Baird, Cat. N. Am. Birds, 1859, no. 674. — Dall and Bannister, Trans. 

 Chicago Ac. Sci., i, 1869, 305 (St. George Island, Pribilof group). ^Finsch, 

 Abh. Nat. Ver. Brem., iii, 1872, 85 (n. w. coast of America). — Saunders, 

 Proc. Zool. Soc. Lond., 1878, 164 (monogr.); Journ. Linn. Soc, xiv, 1878, 394 

 (range); Cat. Birds Brit. Mus., xxv, 1896, 312.— Ridgway, Proc. U. S. Nat. 

 Mus., iii, 1880, 206 (Cat. N. Am. Birds, no. 659); Norn. N. Am. Birds, 1881, 

 no. 659. — Coues, Check List, 2d ed., 1882, no. 784. — Nelson, Cruise 'Cor- 

 win' in 1881 (1883), 105 (Aleutian and Pribilof Islands; St. Matthew Island); 

 Rep. N. n. Coll. Alaska, 1887, 50 (habits). — Bajrd, Brewer, and Ridgway, 

 Water Birds N. Am., ii, 1884, 207.— Stejneger, Proc. U. S. 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. b Nine specimens. 



