Acrocephalus bistrigiceps, Swinh. Ibis, 1860, p. 51; Hume Dav. S. F. vi, p. 338; Hume, Cat. no. 517 ter; Seebohm, Cat. B. M. v, p. 94; Oates, S. F. x, p. 214; id. B. B. i, p. 97.
Coloration. Upper plumage russet-brown, brighter on the rump and upper tail-coverts ; a distinct black streak on each side of the crown of the head; below this a broad pale buff supercilium, running from the base of the. bill; lores dark brown ; ear-coverts hair-brown; sides of neck like the back ; lower plumage pale buff, lighter on the abdomen, and nearly white on the chin and throat; wings and tail brown, edged with russet-brown on the outer webs. The lower plumage is more rufous after the autumn moult.
Iris brown; mouth pale yellow; upper mandible brown, lower flesh-coloured, slightly dusky at the tip; legs plumbeous flesh-colour ; soles of feet yellow ; claws horn-colour.
Length 5.1; tail 2.1; wing 2.1; tarsus .8 ; bill from gape .7; the second primary is generally intermediate in Length between the sixth and seventh, and sometimes equals the seventh; the first primary is large, measuring .5 inch in Length.
Distribution. Common in Southern Pegu near Kyeikpadein from November to April in paddy-fields and grass-jungle. This bird has also been found at Tavoy.
The summer-quartors of this bird appear to be Japan and Eastern Siberia.