ORTHOTOMUS. 55 
of Orthotomus in Panay and another in Guimaras is of course very 
strong. Guimaras is to all intents and purposes a part of Panay and 
there are no other known differences between the birds of the two is- 
lands. Masbate is a new locality for the species.”” (Bourns and Wor- 
céster.) 
“The chestnut-headed tailorbird frequents low bushes in open country, 
also the mangrove swamps; less common in the woods. <A noisy bird, 
its note being very similar to that of O. frontalis.” (Bourns and Wor- 
cester MS.) ‘ 
557. ORTHOTOMUS DERBIANUS Moore. 
DERBY’S TAILORBIRD. 
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); McGrecor and WoRrcESTER, 
Hand-List (1906), 88. 
-Catanduanes (Whitehead); Luzon (Cuming, Everett, Méllendorff, 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 chest- 
nut, 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.) 
558. ORTHOTOMUS CHLORONOTUS Grant. 
GREEN-BACKED TAILORBIRD, 
Orthotomus chloronotus GRANT, Bull. Brit. Orn. Club (1895), 3, 2; Ibis 
(1896), 117, pl. 3, fig. 1; Grant and WHITEHEAD, Ibis (1898), 240 
(eggs); WHITEHEAD, Ibis (1899), 220; SuarpE, Hand-List (1903), 
4, 192; Oates and RED, Cat. Birds’ Eggs (1905), 4, 191, pl. 9, fig. 12; 
McGrecor and Worcester, Hand-List (1906), 88. 
Pi-pit ma-na-nd-hi, Manila. 
Luzon (Whitehead, McGregor). 
Adult.—Differs from Orthotomus derbianus in having the entire back, 
rump, upper tail-coverts, and.crissum olive-green and the rectrices edged 
basally with olive-green. A male measures: Wing, 49; tail, 47; culmen 
from base, 18; bill from nostril, 12; tarsus, 21. A female, wing, 50; 
culmen from base, 18; bill from nostril, 12; tarsus, 19. 
Three eggs of the green-backed tailorbird from Isabela Province, 
Luzon, collected by Whitehead on May 29, 1894, are described as follows: 
“Shape ovate. Ground-color pure white, thinly spotted and dotted all 
