BIRDS OF NORTH AND MIDDLE AMERIOA. 625 
Adult male.—Wing, 365-389 (378.1); tail, 143-161 (150.8); exposed 
culmen, 42-45.5 (44.3); tarsus, 54-61 (56.5); middle toe, 41.5-43.5 
(42,5),% : 
Adult female.—Wing, 334-372 (362.4); tail, 132-150 (141.8); ex- 
posed culmen, 37-41.5 (39.5); tarsus, 47-54 (50.9); middle toe, 
37-42 (39.4).¢ 
Greater part of North America; breeding from southern Oregon 
(Lower Klamath Lake; Malheur Lake), Utah (Great Salt Lake) ?, 
Idaho (Minidoka), Colorado (San Luis Lakes, 7,500 ft. alt.), North 
Dakota (Devils Lake; Stump Lake), Minnesota (Akron Lake), 
Wisconsin (islands in Green Bay, formerly; Lake Koshkonong, in 
1860), northern Michigan (Neebish Islands; Gull Island, near Vaus 
Harbor, in 1892), southern Ontario (islands in Georgian Bay), Quebec 
(Hamilton Inlet; Cape Whittle; Little Mecattina; Rupert House), and 
southeastern Labrador northward to southern Ungava, central 
Keewatin (a little northward of Fort Churchill), southern Mackenzie 
(Great Slave Lake), westward to east-central Alberta (Buffalo Lake, 
near Red Deer) and southeastern British Columbia (Shuswap Lake); 
migrating southward, over whole of United States, as far as Cuba 
and Mexico (Tuhudntepec, Oaxaca, February, March; Mazatlan 
and Presidio de Mazatlan, Sinaloa; Guaymas, Sonora, December; 
Santa Ana, near Guadalajara, Jalisco); accidental in Bermudas 
(Jan. 1, 1849) and Hawaiian Islands (Feb. 1, 1901). 
Larus delawarensis Orv, in Guthrie’s Geog., 2d Am. ed., ii, 1815, 319 (Delaware 
River, below Philadelphia).—Lawrencs, in Baird, Rep. Pacific R. R. 
Surv., ix, 1858, 846; Ann. Lyc. N. Y., viii, 1867, 299 (vicinity New York 
City); Mem. Bost. Soc. N. H., ii, 1874, 317 (Mazatlan, Sinaloa, in winter); 
Bull. U. 8. Nat. Mus., no. 4, 1876, 51 (Tehuantepec, Oaxaca, Feb., March).— 
a Ten specimens. 
Ex- 
Locality. Wing. | Tail. te Tarsus. a 
men. 
MALES, 
One adult male from Nevada (November)..........-....-.-... 384 151 45.5 56.5 43 
One adult male from New Mexico (September)................ 389 161 45.5 61 43.5 
Three adult males from California (May, June, September)....| 373.3 | 145.3 44.3 56.7 42.3 
Four adult males from Sonora (March, April)............-.-... 378 154.2 44.2 55.9 42.5 
One adult male from Jalisco (December).................-2-+-- 376 143 42 54 41.5 
FEMALES. 
One adult female from District of Columbia (March)........... 368 143 39 48.5 38 
- One adult female from Illinois (March).......... ageing Seegieerey 357 138 41.5 54 42 
One adult female from Nebraska (April)............---.2...--- 369 143 39.5 52 41 
Two adult females from Wyoming (July)........-...-.-....+-- 357 141.5 38 49.2 39.7 
One adult female from Nevada (December)..............-.--.- 366 146.5 41 50 37 
One adult female from Oregon (June)........-.-.2.-2--022 222 ee 372 132 41 53.5 41 
One adult female from Lower California (February)..........- 372 142.5 39 51 38.5 
One adult female from Sonora (no date).......-.....--..------ 334 140 38 50 38.5 
One adult female from Sinaloa (no date).....-...-...-2-.-.200+ 372 | 150 40 52 39 
40017—19—Bull. 50, pt 8——41 
