670 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



web; next two (fifth and sixth, from inside) with inner webs gra3-ish 

 white, the outer webs paUid gray, both very broadly tipped with 

 black, and the shafts dusky; seventh primary similar but with 

 median portion grayish dusky, forming a lanceolate stripe; tliree 

 outer primaries with outer webs wholly blackish, their inner webs 

 with a broad stripe of the same along shafts; alula, carpal region, 

 and primar}^ coverts plain sooty black, the last narrowly tipped with 

 pale grayish buff; lateral and lower portions of head and neck white 

 rather indistinctly barred with dusky, except on chin and throat, 

 and with a dusky suffusion immediately in front of eye; under parts, 

 from cliest backward, including axillars, immaculate white; under 

 wing-coverts and under surface of primaries palhd neutral gray; 

 bill black, more brownish basaUy; iris brown; legs and feet ''dull 

 fleshy purple".'' 



Downy young. — "Ground-color dusky yellow (pale sulphur yeUow 

 to burnt wood yellow, occasionally with a rusty tinge) this densely 

 covered with numerous irregular blackish gray markings, pale and 

 ill-defined on flanks and nearly black on head, the abdomen and 

 median portion of breast mimaculate whitish; the pattern of markings 

 for the most part with longitudinal tendency, transverse on nape, 

 and cuneate on crown. ^" 



Yoang maJ.e.'—Wmg, 241-261 (253.3); tail, 98.5-119 (10S.2); 

 exposed culmen, 18-22 (20.4); tarsus, 29-31 (30.2); middle toe, 

 24-27 (25.8).'* 



Young female.— Wing, 245-259 (253.9); tail, 106-118.5 (109.3); 

 exposed cuhnen, 19.5-21 (20.1); tarsus, 28-31 (29.6); middle toe, 

 24.5-26 (25.5).^ 



Arctic regions, circumpolar; breeding on western coast of Green- 

 land, in vicinity of Disko Bay (Ekomuit, district of Christians- 

 haab;'' Disko Bay)^, and in northern Siberia, from Russkoe Ustje, 

 delta of Indighka River (lat. 71° X.; long. 149° E.) and 300 miles 

 inland in lat. 67° 30' N.; 145° E. to northeastern portion of Kolyma 

 delta (lat. 69° 30' N.; long. 161° E.) and about 200 miles mland at 



« E. W. Nelson. 



b Buturlin, Ibis. 1906, 3.34. 



c-Of the sixteen specimens, with sex determined, examined, all are young in their 

 first autumn, the few adults seen being undetermined as to sex. 



<i Nine specimens. 



< Seven specimens. An adult differs only in longer tail, its measurements, being 

 as follows: Wing, 256; tail, 122; exposed culmen, 21; tarsus, 30.5; middle toe, 26. 

 (No. 222, 502, coll. U. S. Nat. Mus., St. George Island, Alaska, May 25, 1911.) 



/ Dalgleirfh, Auk, iii, 1886, 273. 



9 Seebohm, Proc. Zool. Soc. Lond., 1886, 82. These two records, which may pos- 

 sibly refer to the same occurrence (I have not now access to the last work cited), wer^ 

 either overlooked or ignored by Professor Cooke in his "Distribution and Migration 

 of North American Gulls and their Allies" (1915, pp. 62-64). 



