Acrocephalus fasciolatus Gray, Proc. Zool. Soc. (1860), 349.
Locustella fasciolata Seebohm, Cat. Birds Brit. Mus. (1881),
5, 109, pl. 5; Whitehead, Ibis (1899), 210 (habits, migration);
Sharpe, Hand-List (1903), 4, 185; McGregor and Worcester, Hand-List
(1906), 87.
Batan (McGregor); Calayan (McGregor); Luzon (Everett, Whitehead,
Celestino); Marinduque (Steere Exp.); Mindoro (Porter); Sulu
(Bourns & Worcester); Tablas (Bourns & Worcester); Tawi Tawi
(Bourns & Worcester). Talaut, Sangir, and Molucca Islands, eastern
Siberia, China, and Japan; in winter to Batchian, Halmahera,
and Morotai.
Male (Batan Island, May).--Above dark russet-brown; wings and tail
seal-brown, edged with russet-brown; second primary edged with gray;
a distinct line over lores, eye, and ear-coverts ashy gray; lores and
upper ear-coverts dusky; chin and fore throat white, becoming ashy
or drab-gray on cheeks, ear-coverts, sides of throat, and breast;
breast ashy gray, becoming white on middle of abdomen; sides, flanks,
and thighs light olive-brown; crissum yellowish olive-brown. Wing,
76; tail, 68; outermost rectrix, 45; culmen from base, 20; bill from
nostril, 11; tarsus, 26; middle toe with claw, 24.
In winter the upper parts, especially the head, are lighter; the
superciliary stripe, cheeks, and under parts are washed with buff and
the gray is entirely obscured. The male and female are very similar if
not identical in colors. A female from Calayan in fresh winter-plumage
measures: Wing, 72; tail, 66; culmen from base, 19; bill from nostril,
11; tarsus, 26. A female in somewhat worn plumage, wing, 72; tail,
68; culmen from base, 19; bill from nostril, 11; tarsus, 25.