o BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO SUBSPECIES OF BDDYTBS' FLAVUS. 



a. Under parfa distinctly yellow; pileuin and hindneck gray, in contrast with olive- 

 greenish of back. (Adults. ) 

 6. Under parts deeper and purer yellow (lemon yellow), throat always (?) wholly 

 yellow, only the chin being white; back brighter olive-green. (Europe, etc.) 



Bndytes flavus flavus (extralimital)a 

 66. Under parts paler and duller yellow; throat always (?) more or less white 

 on upper portion; back duller olive-green. 

 c. Brighter yellow below, with less of dusky spotting on chest; back and rump 

 brighter olive-green; larger, especially the bill (adult male averaging wing 

 79.9, exposed culmen 12.6; adult female averaging wing 76.2, exposed 

 culmen 12.8) . (Eastern Siberia and Kamchatka, south in winter to south- 

 ern Asia, etc. ) Budytes flavus leucostriatus ( extralimital ) * 



cc. Duller and paler yellow below, with more of dusky on chest; back and rump 

 duller olive-green (the back more grayish); smaller, especially the bill 

 (adult male averaging wing 77.4, exposed culmen 11.7; adult female aver- 

 aging wing 74.6, exposed culmen 11.7). (Western Alaska, north of the 

 Alaskan peninsula, in summer; probably migrating through eastern Asia 



to the Philippine Islands in winter. ) Budytes flavus alascensis (p. 8) 



aa. Under parts dull buffy yellow or light yellowish buff, or dull whitish sometimes 

 clouded with dusky on chest; pileum and hindneck olive or grayish brown, 

 like back. (Young. ") 



BUDYTES FLAVUS ALASCENSIS, new subspecies.!* 

 ALASKAN YELLOW WAOTAIL. 



Similar to B. f. leucostriatiis, but slightly smaller, especially the 

 bill ; coloration duller, the yellow of under parts paler and less pure, 

 the chest more distinctly clouded or blotched with grayish, the olive- 

 green of rump, etc. , less pronounced. 



alMotacillajflava Linnseus Syst. Nat., ed. 10, 1758,185. — Motacilla flava Naumann, 

 Vog. Deutschl., iii, 1823, 839, pi. 88; Dresser, Birds Europe, iii, 1875, 261, pi. 129, part, 

 figs. 1, 2; Sharpe, Cat. Birds Brit. Mus., x, 1885, 516, part. — Budytes flava Cuvier, 

 Kfigne An., 1817, 371; Fritsch, Vog. Eur., 1870, pi. 17, figs. 17, 18.— Para* liUeus Gmelin 

 (S. G.), Reis. Eussl., iii, 1774, 101, pi. 20, fig. \.—Pam caspieiu Gmelin (S. G.), 

 Keis. Russl., iii, 1774, 104, pi. 20, fig. 2. — Moiacilla chrysogastra Bechstein, Kurze 

 Uebers., 1811, 327. — MotacUlaflavescens Stephens, Shaw's Gen. Zool., pt. 2, 1817, 559. — 

 Motacilla neglecta Gould, Proc. Zool. Soc. Lond., 1833, 129; Birds Europe, ii, 1837, 

 pi. 146. — Motacilla gouldi Macgillvray, Man. Brit. Birds, i, 1840, 163. — Motacilla flava 

 vulgaris Sundevall, Ofv. k. Vet.-Ak. Forh. Stockh., 1840, 53. — Budytes fasciatus Brehm, 

 Vogelf., 1855, 141. 



i Motacilla flaveola (part) Pallas, Zoogr, Rosso-Asiat., i, 1826, 501.— Motacilla flava 

 (not of Linnseus) Middendorff, Sibir. Reise, ii, pt. 2, 1853, 168; Schrenck, Reise 

 Amurl., i, 1860, 345; Radde, Reisen Siiden Ost-Sibir., ii, 1863, 229; Sharpe, Cat. 

 Birds Brit. Mus., x, 1885, 516, part. — Budytes flava Swinhoe, Proc. Zool. Soc. Lond.> 

 1863, 274 (n. China; crit.); Taczanowski, Journ. fiir Cm., 1875, 252 (Ussuri).— 

 Budytes flavus Swinhoe, Proc. Zool. Soc. Lond., 1871, 364 (China). — Budytes leucostri- 

 atus Homeyer, Journ. fur Om., xxvi, Jan., 1878, 128 (Baikal). — Budytes flavus 

 leucostriatus Stejneger, Bull. U. S. Nat. Mus., no. 29, 1885, 280 (Bering islands and 

 Petropaulski, Kamchatka; syn., crit., etc.). — Budytes leucostria Taczanowski, Bull. 

 Soc. Zool. France, 1882, 389. 



"The series of young birds available is much too small to enable me to give sub- 

 specific characters. 



<^Type no. 73231, coll. U. S. Nat. Mus., adult male, St. Michael, Alaska, June 1, 

 1877; L. M. Turner. 



