BIEDS OF NOETH AND MIDDLE AMERICA. 



625 



Adultmale.— 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 culmeii, 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 KosJikonong, in 

 1860), nortliern Michigan (Neebish Islands; Gull Island, near Vans 

 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 (Tuhuantepec, 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 Ord, in Guthrie's Geog., 2d Am. ed., ii, 1815, 319 (Delaware 

 River, below Philadelphia). — Lawrence, in Baird, Rep. Pacific R. R. 

 Surv., ix, 1858, 846; Ann. Lye. N. Y., viii, 1867, 299 (vicinity New York 

 City); Mem. Bost. Soc. N. H., ii, 1874, 317 (Mazatlan, Sinaloa, in winter); 

 Bull. U. S. Nat. Mu8., no. 4, 1876, 51 (Tehuantepec, Oaxaca, Feb., March).— 



o Ten specimens. 



Locality. 



MALES. 



One adult male from Xevada (Xovember) 



One adult male from Xew Mexico (September) 



Three adult males from California (May, June, September) 



I<'our adult males from Sonorai (March, April) 



one adult male from Jalisco (December) 



FEMALES. 



One adult female from District of Columbia (March) 



(Jne adult female from Illinois (March) 



One adult female from Nebraska (April) 



Two adult females from Wyoming (July) 



One adult female from Xevada (December) 



One adult female from Oregon (June) 



One adult female from Lower California (February) 



One adult female from Sonora (no date) 



One adult female from Sinaloa (no date) 



40017— 19— Bull. 50, pt 8 41 



Ex- 

 posed 

 cul- 



45.5 

 45.5 

 44.3 

 44.2 

 42 



39 



41.5 



39.5 



38 



41 



41 



39 



38 



40 



Tarsus, 



56.5 



61 



56.7 



55.9 



54 



48.5 



54 



52 



49.2 



50 



53.5 



51 



50 



52 



Middle 

 toe. 



43 



43.5 



42.3 



42.5 



41.5 



38 



42 



41 



39.7 



37 



41 



38.5 



38.5 



39 



