Species.
- a1. Larger; wing more than 60 mm.;
plumage without spots or streaks.
- b1. Slightly larger; bill, tarsus, and toes decidedly heavier; bill from nostril about 11 mm.; rectrices uniform in color, the outermost pair slightly longer than the under coverts fasciolata (p. [567])
- b2. Slightly smaller; bill, tarsus, and toes decidedly more slender; bill from nostril about 10 mm.; rectrices with pale tips and subterminal blackish bars, the outermost pair slightly shorter than the under coverts. ochotensis (p. [568])
- a2. Smaller; wing less than 60 mm.; feathers of upper parts with conspicuous, dark, median streaks; chest, sides, and flanks usually marked with elongate dark spots lanceolata (p. [569])
548. LOCUSTELLA FASCIOLATA (Gray).
GRAY’S GRASSHOPPER WARBLER.
- 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.