308 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
CALIDRIS ALBA (Pallas). 
SANDERLING. 
Adults in summer (sexes alike).—Pileum and hindneck pale rusty 
or cinnamon-rufous, intermixed, more or less,“ with grayish white, 
rather broadly streaked with black or dusky; scapulars and inter- 
scapulars black centrally, broadly margined with light cinnamon- 
rufous or rusty and very pale gray or grayish white;? anterior lesser 
wing-coverts (especially near bend of wing) nearly uniform dusky, the 
remaining lesser coverts and middle coverts dusky centrally, broadly 
margined terminally with white, the greater coverts grayish brown 
or brownish gray, paler along edges and very broadly tipped with 
white; secondaries immaculate white for basal half or more, the 
distal portion dusky margined terminally with white; primary 
coverts and primaries dusky, the former rather broadly tipped with 
white (except the longer or distal ones), the proximal (inner) pri- 
maries with basal half or more of outer webs white; tertials brownish 
gray narrowly margined with white and with blackish shafts; rump 
and shorter (anterior) median upper tail-coverts brownish gray, the 
feathers darker centrally and broadly margined with pale gray and 
grayish white, the lateral upper tail-coverts immaculate white; longer 
(posterior) median upper tail-coverts and middle pair of rectrices 
dusky narrowly margined with pale gray or grayish white, the re- 
maining rectrices light grayish brown narrowly margined with 
whitish, the outermost pair paler and with considerable of white on 
outer web; sides of head and neck pale rusty or cinnamon-rufous, 
more or less intermixed with white, streaked and flecked with dusky, 
the foreneck and chest similar, but spotted and barred rather than 
streaked; chin, throat, and under parts of body immaculate white, 
the sides of breast, however, suffused with rusty or cinnamomeous 
and irregularly barred or transversely spotted with dusky; axillars 
and most of under wing-coverts immaculate white; bill, legs, and 
feet black; iris dark brown. 
Winter plumage.—Above pale gray (the anterior lesser wing- 
coverts dusky) relieved by narrow shaft-streaks of dusky; under 
parts wholly immaculate white; otherwise as in summer. 
Young.—Above pale grayish, spotted with blackish and whitish, 
the latter on tips of the feathers; otherwise like winter plumage, but 
chest more or less tinged with dull buff. 
Adult male.—Wing, 113-124.5 (119.1); tail, 45-55 (50.3); exposed 
ae 23-26 (24.7); tarsus, 23-25 (23.7); middle toe, 14.5-16 
15.5).° 
@Karlier in the season the pale gray or grayish white predominates, the rusty or 
cinnamon-rufous increasing toward midsummer. 
+ Fourteen specimens, 
