670 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
web; next two (fifth and sixth, from inside) with inner webs grayish 
white, the outer webs pallid gray, both very broadly tipped with 
black, and the shafts dusky; seventh primary similar but with 
median portion grayish dusky, forming a lanceolate stripe; three 
outer primaries with outer webs wholly blackish, their inner webs 
with a broad stripe of the same along shafts; alula, carpal region, 
and primary 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 chest backward, including axillars, immaculate white; under 
wing-coverts and under surface of primaries pallid neutral gray; 
bill black, more brownish basally; iris brown; legs and feet “dull 
fleshy purple’’.¢ 
Downy young.—‘‘Ground-color dusky yellow (pale sulphur yellow 
to burnt wood yellow, occasionally with a rusty tingé) 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 immaculate whitish; the pattern of markings 
for the most part with longitudinal tendency, transverse on nape, 
and cuneate on crown.?” 
Young male.—Wing, 241-261 (253.3); tail, 98.5-119 (108.2); 
exposed culmen, 18-22 (20.4); tarsus, 29-31 (30.2); middle toe, 
24-27 (25.8).4 
Young female.—Wing, 245-259 (253.9); tail, 106-118.5 (109.3); 
exposed culmen, 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)9, and in northern Siberia, from Russkoe Ustje, 
delta of Indigirka River (lat. 71° N.; 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 inland at 
ak. W. Nelson. 
> Buturlin, Ibis, 1906, 334. 
¢ Of the sixteen specimens, with sex determined, examined, all are young in their 
first autumn, the few adults seen being undetermined as to sex. 
@ 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.) 
f Dalgleish, 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), were 
either overlooked or ignored by Professor Cooke in his ‘Distribution and Migration 
of North American Gulls and their Allies” (1915, pp. 62-64). _ 
