622 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult female.— Wing, 317-402 (374.9); tail, 123.5-168 (144.7); 

 exposed culnien, 42-52.5 (45.4); tarsus, 47-59.5 (52.1); middle toe, 

 45-52.5 (47.6).« 



Western North America, from southern Mexico to Mackenzie; 

 breeding from eastern California (Mono Lake; Eagle Lake; Clear 

 Lake), Nevada (islands in PjTamid Lake; Soda Lakes, Carson 

 Desert), Utah (islands in Great Salt Lake; Utah Lake) and North 

 Dakota (Stump Lake; Devils Lake), to Mackenzie (Fort Anderson; 

 lower Anderson River; Great Slave Lake, from Fort Resolution to 

 Fort Rae) ; migrating to Coast of California and southward as far as 

 southern Mexico (Rio de Coahuyana and Manzanillo, Colima; San 

 Mateo, Oaxaca, Feb. ; Alvarado, Vera Cruz) ; also occuring as migrant 

 (regular or casual) in western Oregon (Portland), British Columbia 

 (coast as far northward as Cormorant Island; Esquimault; Vancouver 

 Island; Hot Springs, Alton; Okanagan Lake), Kansas (Reno County, 

 Oct. 20, 1880), Texas (Galveston; Laredo, Oct. 16, 1866), Colorado 

 (Middle Park, 7,000 ft. alt., April 28, 1874; Denver, Oct. 26, 1878; 

 Coventry, 1905; Loveland, May 7, 1890; Larimer County, April 18, 

 1894), and accidental in Hawaiian Islands. 



Larus californicus Lawrence, Ann. Lye. Nat. Hist. N. Y., vi, 1854, 79 (San Joa- 

 quin River, near Stockton, California; coll. G. N. Lawrence); in Baird, Rep. 

 Pacific R. R. Surv., ix, 1858, 846: Bull. U. S. Nat. Mus., no. 4, 1876, 51 (San 

 Mateo, Oaxaca, Feb.). — Baird, Cat. N. Am. Birds, 1859, no. 663.— Cooper 

 and SucKLEY, Rep. Pacific R. R. Surv., xii, pt. ii, 1860, 273 (coast of Wash- 

 ington).— Cotjes, Proc. Ac. Nat. Sci. Phila., 1862, 300 (monogr.); Birds North- 

 west, 1874, 634 (monogr.); Check List, 2d ed., 1882, no. 777.— Blakiston, 



a Eight specimens. 



Locality. 



MALES. 



Three adult males from Mackenzie (June, July) 



Two adult males from western Nevada (May, July) . . . 



One adult male from Utah (July) 



One adult male from Southern California (November). 



One adult male from State of Colima, wsstern Mexico 



(October) 



FEM.\LES. 



One adult female from western Nevada (May 26) 



Four adult females from coast of Washington (.\ugust, 

 September) 



Three adult females from coast of California (Novem- 

 ber, December) 



Ex- 

 posed 

 cul- 

 men. 



Depth 

 of bill 



at 

 gonyd • 



eal 



Middle 



49 

 46.5 



44.5 



43 



43.1 



49.2 



54 

 50.5 

 50 

 61 



46 



46 

 46 

 50.2 



