ORTHOTOMUS. 575 



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- 

 cester.) 



"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 0. frontalis/' (Bourns and Wor- 

 cester MS.} 



557. ORTHOTOMUS DERBIANUS Moore. 



DERBY'S TAILORBIRD. 



Orthotomus derlianus MOORE, Proc. Zool. Soc. (1854), 309, pi. 76; SHABPE, 

 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, Mollendor-ff, Bourns d 

 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 olivergreen; 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 0. 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, pi. 3, fig. 1; GRANT and WHITEHEAD, Ibis (1898), 240 

 (eggs); WHITEHEAD, Ibis (1899), 220; SHARPE, Hand-List (1903), 



4, 192; GATES and REID, Cat. Birds' Eggs (1905), 4, 191, pi. 9, fig. 12; 



MCGREGOR 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 rectnces 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 



