Orthotomus derbianus Moore, Proc. Zool. Soc. (1854), 309, pl. 76;
Sharpe, Cat. Birds Brit. Mus. (1883), 7, 224; Hand-List (1903), 4,
192; Whitehead, Ibis (1899), 220 (habits); McGregor and Worcester,
Hand-List (1906), 88.
Catanduanes (Whitehead); Luzon (Cuming, Everett, Möllendorff,
Bourns & Worcester, Whitehead, McGregor).
Adult.--Top of head from bill to nape, lores, narrow line under eye,
and upper parts of ear-coverts chestnut; back, rump, and tail-coverts
cinereous; wing-feathers brown, edged with olive-green; tail dull
chestnut, edged with gray at base; under parts light gray, streaked
with white on throat and breast; thighs chestnut; iris and legs
tan-brown; nails flesh-color. Length, about 140. Male, wing, 50;
tail, 50; culmen from base, 19; bill from nostril, 12; tarsus, 20.
"Habits similar to those of O. frontalis. A male measures as follows:
Wing, 47; tail, 47; culmen, 18; tarsus, 19.5; middle toe with claw,
18. A female, wing, 46; tail, 41; culmen, 19; tarsus, 19.5; middle
toe with claw, 17.5." (Bourns and Worcester MS.)