646 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



parts less yellowish, usually white, with little if any yellow tinge. 

 Young much darker above than that of S. n. noveboracensis, the 

 feathers entirely dusky (except the buffy tip), instead of olive with a 

 subterminal bar of dusky.' 



AdwU ma^e.— Length (skins), 130.8-148.3 (139".6); wing, 73.6-81.3 

 (77.3); tail, 50.8-57.1 (53.4); exposed culmen, 12.4-16 (13.6); tarsus, 

 20-22.3 (21.6); middle toe, 12.7-14.2 (13.7)." 



Adult female.— length (skins), 127.2-152.1 (139.2); wing, 78.1-79 

 (75.7); tail, 48.8-57.9 (53.3); exposed culmen, 12.2-14.2 (13.2); tarsus, 

 21.1-22.3 (21.8); middle toe, 12.4-13.7 (13.2).' 



Western North America; breeding from Minnesota (north of Red 

 Wing), western Nebraska (Sioux (yountj'^), and probably the more 

 northern Rocky Mountain districts of the United States to Alaska 

 (whole of wooded districts), and East Cape, Siberia; southward dur- 

 ing migration throughout western United States (including Mississippi 

 Valley), more rarely through Atlantic coast States (New Jersey, Dis- 

 trict of Columbia, Virginia, South Carolina, Florida, etc.), to the 

 Bahamas (New Providence Island, February), Cuba (Santiago, Novem- 

 ber 18), island of Old Providence, Caribbean Sea, Cozumel Island, 

 Yucatan, through Mexico and Central America* to Colombia (Chirua, 

 province of Santa Marta, February), and to Cape St. Lucas. 



(?) Seiuras tenwirostris Swainson, Philos. Mag., ii. s., i, 1827, 360 (Mexico). 



Sciwrus lenuirostrig Gambel, Proc. Ac. Nat. Sci. Phila., i, 1843, 261 (Colorado R.). 



Seiurus noveboracenm Baikd, Rep. Pacific R. R. Surv., ix, 1858, 261, part (Ver- 

 milion R. ) ; Cat. N. Am. Birds, 1859, no. 187, part; Review Am. Birds, 1865, 

 215, part (Yukon R.; Fort Norman, Fort Peels R., Fort Simpson, and Fort 

 Rae, arctic Am.; Hellgate, Idaho; Camp Moogie, Washington). — Hayden, 

 Trans. Am. Philos Soc, xii, 1862, 160 (upper Missouri R. ). — Blakiston, Ibis, 

 1862,4 (Saskatchewan); 1863, 62 (Fort Carlton, British North America). — 

 Dall and Bannister, Trans. Chicago Ac. Sci., i, 1869, 278 (Fort Yukon, 



' With only one specimen of the young of each form I can not be sure that the 

 differences, as stated above, are constant. 



' Thirteen specimens. 



' Nine specimens. 



Mississippi Valley specimens average smaller than those from the Rocky Moun- 

 tains and westward, and are really intermediate in size between S. n. notahilis and 

 S. n. noveboracenm. Average measurements are as follows: 



* Mexican and Central American localities represented among the specimens exam- 

 ined are the following: Oaxaca (Tapana, April 15) ; British Honduras (Belize, Decem- 

 ber 14); Nicaragua (Greytown, February 5); Veragua (Calovevora). Although 

 occurring in winter at the Cape district of Lower California (San Pedro, March 14; 

 La Paz, February 24), I have no record of its occurrence in California. 



