BIRDS OF NORTH AND MIDDLE AMERICA. 623 
Ibis, 1863, 152 (Mackenzie River).—E.iior, New and Unfig. N. Am. Birds, 
pt. 7, 1867 (vol. ii), pl. 52, lower fig., and text.—Hunsnaw, Ann. Lyc. N. Y., 
xi, 1875, 13 (Utah); Birds Hawaiian Is., 1902, 127 (1spec., locality unknown).— 
Riveway, Bull. Essex Inst., vii, 1875, 16 (Pyramid Lake, Nevada, breed- 
ing), 32 (Great Salt Lake, Utah, breeding); Or. 40th Parallel, 1877, 637; 
Proc. U. 8, Nat. Mus., iii, 1880 (Cat. N. Am. Birds), 207; Nom. N. Am. Birds, 
1881, no. 668.—BENDIRE, Proc. Bost. Soc. N. H., xix, 1877, 148 (Malheur 
Lake, e. Oregon, breeding).—Saunprrs, Proc. Zool. Soc. Lond., 1878, 175 
(monogr.); Cat. Birds Brit. Mus., xxv, 1896, 276 (Vancouver Island and 
Esquimault, Brit. Columbia; Yellowstone Lake, Aug.; etc.).—BELDING, 
Proc. U. 8. Nat. Mus., v, 1883, 549 (San Jose del Cabo, Lower California, 
May 17).—Barrp, Brewer, and Ripaway, Water Birds N. Am., ii, 1884, 
242,—FerraRi-Perez, Proc. U. 8. Nat. Mus., ix, 1886, 179 (Alvarado, Vera 
Cruz).— AMERICAN OrNITHOLOGISTS’ Union, Check List, 1886, and 2d ed., 
1895, no. 53; 3rd ed., 1910, p. 39.—TownseEnp, Proc. U.S. Nat. Mus., x, 1887, 
191 (Eagle Lake, California, breeding).—Cooxp, Bird Migr. Miss. Val., 1888, 
56 (Reno Co., Kansas, 1 spec., Oct. 20, 1880); Bull. 56, Col. Agric. Exp. Sta., 
1900, 192 (Middle Park, Colorado, 7,000 ft., April 24; Denver, Oct. 26); Bull. 
292, U.S. Dept. Agric. (Biol. Surv.), 1915, 41, fig. 21 (range and migrations).— 
MacFar.ane, Proc. U. 8. Nat. Mus., xiv, 1891, 418 (lower Anderson River, 
Mackenzie, breeding).—Ricumonp and Know tron, Auk, xi, 1894, 301 (Jef- 
ferson River, Montana, Sept.).—Brewster, Bull. Mus. Comp. Zool., xli, 
no. 1, 1902, 20 (La Paz, etc., Lower California, in winter).—Sanvin and Gop- 
MAN, Biol. Centr.-Am., Aves, iii, 1903, 425 (Valley of Mexico; Alvarado, Vera 
Cruz; San Mateo, Oaxaca).—Seton, Auk, xxv, 1908, 69 (Great Slave Lake, 
Mackenzie, abundant).—Prestiz, North Am. Fauna, no. 27, 1908, 267 (Great 
Slave Lake, breeding; Fort Resolution).—GRINNELL (J.), Pacific Coast Avif., 
no. 4, 1915, 22 (California; winter visitant to whole of State, breeding at Eagle 
Lake, Lassen Co.; occasional in summer from Lake Tahoe northward). 
L{arus] californicus Coves, Key Nv Am. Birds, 2d ed., 1884, 745.—Ripeway, Man. 
N. Am. Birds, 1887, 31.—Bryan, Key Birds Hawaiian Group, 1901, 7 (Ha- 
waiian Islands, accidental). 
[Larus] californicus SHARPE, Hand-list, i, 1899, 142.—ForBes and Ropinson, 
Bull. Liverp. Mus., ii, no. 2, 1899, 58. 
[Laroides] californicus Bonararte, Compt. Rend., xlii, 1856, 770; Consp. Av., ii, 
1857, 220. 
[Larus delawarensis.] Var. californicus Cours, Key N. Am. Birds, 1872, 313. 
Larus delawarensis . . var. californicus Cours, Check List, 1878, no. 548a. 
L{arus] argentatus, var. californicus Ripaway, Bull. Essex Inst., v, Nov., 1873, 
173, 195, in text (Pyramid Lake, Nevada; Great Salt Lake, Utah); vii, 1875, 
40 (Nevada). 
Larus delawarensis (not of Ord) ALLEN (J. A.), Bull. Mus. Comp. Zool., iii, 1872, 
173, 183 (Great Salt Lake, Utah, breeding). 
LARUS DELAWARENSIS Ord. 
RING-BILLED GULL. 
Adults in summer (sexes alike).—Head, neck, rump, upper tail- 
coverts, tail, and entire under parts, including axillars and under 
wing-coverts, immaculate pure white; back, scapulars, and wings 
uniform pale gray (between pale neutral gray and no. 8 gray), the 
tertials, secondaries, and proximal primaries rather broadly, but not 
