Order CHARADRIIF0RME8 
No. 200. 
Family SCOLOPACIDJE. 
ARENARIA LEUCOPH^A TRIDACTYLA. 
EASTERN SANDERLING. 
(Plate 158.)* 
Tbinga tbidactyla Pallas, Zoogr. Rosso.-Asiat., Vol. II., p. 198, 1827 ; Lake Baikal, Asia. 
Tringa tridactyla Pallas, Zoogr. Rosso-Asiat., Vol. II., p. 198, 1827. 
Tringa (Calidris) arenaria Middendorff, Sibirische Reise, Vol. II., p. 219, 1851. 
Calidris arenaria (not Linne) Swinhoe, Proc. Zool. Soc. (Lond.) 1863, p. 315 ; Stejneger, 
Bull. U.S. Nat. Mus., No. 29, p. 122, 1885 ; Newton, Rec. Austr. Mus., Vol. II., 
p. 22, 1892 (New South Wales) ; Taczanowski, Mem. I’Acad. Imp. Sci. St. Petersb., 
Ser. VII., Vol. XXXIX., p. 841, 1893 ; Sharpe, Ibis 1894, p. 541 ; Campbell, 
Proc. Roy. Soc. Viet., Vol. VII., n.s., p. 201, 1895 ; Sharpe, Cat. Birds Brit. Mus., 
Vol. XXIV., p. 526, 1896 ; Campbell, Nests and Eggs Austr. Birds, p. 816, 1901 ; 
Carter, Emu, Vol. III., p. 177, 1904 ; HaU, Key Birds Austr., p. 87, 1906 ; Mathews, 
Handl. Birds Austral., p. 27, 1908. 
Arenaria leucopTicea Mathews, Nov. Zool., Vol. XVIII., p. 222, 1912. 
Distbibution. Siberia (breeding), migrating southward to Australia in winter. 
Adult male, in summer -'plumage. Head and neck all round rufous with narrow brown 
shaft-streaks ; a narrow crescentic white line immediately below the eye ; back 
and scapulars blackish the feathers fringed with rufous or white, some of the 
rufous margins mottled with black ; lesser wing-coverts brown, median and greater- 
coverts tipped with white ; bastard-wing and primary-coverts dark brown ; primary- 
quills also dark brown on the outer webs and at the tips, inner webs paler brO\vn, 
shafts white except at the extreme tips, some of the inner primaries white on 
the outer webs ; secondaries brown, some of the inner ones almost white, the 
innermost like the back ; upper tail-coverts blackish with white tips, the long central 
ones entirely blackish : mid^e tail-feathers dark brown, blackish towards the tips, 
the outer feathers much paler and mottled or dusted with brown and white ; 
breast, abdomen, and under tail-coverts white as also the axiUaries and under 
wing-coverts, the small marginal coverts show minute blackish dots. Total length 
207 mm. ; culmen 25, wing 125, tail 51, tarsus 25. 
Ad'idt fermU, in summer-plumage. Similar to the adult male, but larger and not quite 
so bright rufous. 
Adult male, in winter-plumage. Upper-parts pale grey with dark shaft-hnes, including 
the head, hind-neck, sides of neck, median wing-coverts, and scapulars ; lesser 
upper wing-coverts dark brown ; greater wing-coverts dark brown broadly tipped 
with white ; bastard-wing and primary-coverts dark brown or blackish, some 
* The Plate is lettered Arenaria leucophcea. 
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