BIRDS OF NORTH AND MIDDLE AMERICA. 695 
nally; two outer primaries with shafts white or yellowish white; 
chest (sometimes breast also, more rarely even upper part of abdo- 
men) immaculate white, shading posteriorly into grayish, the under 
tail-coverts, anal region, flanks, and (usually) abdomen being neutral 
gray; bill blackish terminally, the basal portion brownish or horn 
color; iris dark brown; tarsi and basal portion of toes and webs 
light bluish gray in life, drying light olive or yellowish, the remaining 
portion of toes and their webs black. 
Immature.— Under parts and upper tail-coverts barred with vary- 
ing degrees of ash-brown; very little yellow on the sides of the neck; 
otherwise similar to adults.’’¢ 
Young.— Ash-brown above, the head darkest; the feathers of 
the mantle and tail-coverts merely tipped with buff, but without any 
rufous tint; under parts dull grayish white, barred with ash-brown.” @ 
Downy young.—Grayish brown above and below, much paler 
than in S. crepidatus.” * 
Adult male.—Wing, 295-327 (309.1); tail (middle rectrices), 263- 
350 (299); exposed culmen, 27-31.5 (28.6); tarsus, 38-44 (41.1); 
middle toe, 31-36.5 (32.7).° ; 
Adult female.—Wing, 305-317 (313.3); tail (middle rectrices), 
238-350 (295); exposed culmen, 27.5-30 (28.8); tarsus, 40-42.5 
(41.8); middle toe, 31-34.5 (32.5).° 
Breeding on both coasts of Greenland (from extreme northwestern: 
corner southward on western side to Disko Bay, on eastern side to 
Scoresby Sound), and on adjacent island of Ellesmere Land (Cape 
Union and King Oscar Land), in northern Mackenzie (Franklin Bay; 
Baillie Island; near Fort Anderson; Caribou Hills), Yukon (La 
Pierre House), northwestern Alaska (shores of Kotzebue and Norton 
Sounds) and Arctic coast of Siberia (Yenesei River; Kolyma delta) 
to northern Russia (Archangel; Kanin Peninsula; Novaya Zemlya) ; 
@ Saunders, Cat. Birds Brit. Mus., xxv, 1896, 337. 
b Sixteen specimens. ¢ Six specimens. 
. . Cul- Middle 
Locality. Wing. | Tail. men: Tarsus. toe. 
MALES. 
‘One adult male from Lapland.............-..-2.-2-2-. 2222 eee 313 327 31 43 32.5 
One adult male from Faroe Islands..............22--2.+-22++5- 300 263 30 38.5 32 
One adult male from Greenland .................226eese eee e eee 315 275 30 ALS 33 
Ten adult males from Alaska............-.0..-- eee cece eee eeee 308.5} 299.5 28.6 41.1 32.8 
Three adult males from Bering Island, Kamchatka............ 311 301.3 26.7 41.2 32.7 
FEMALES, 
One adult female from Grand Banks...................-2----+- 313 283 28 42.5 che 
Five adult females from Alaska...........:........22.002200025 311.4 | 297.4 28.9 41.7 32.8 
