TRIBURA. 571 



552. ACROCEPHALUS ORIENTALIS (Temminck and Schlegel). 

 ORIENTAL EEED WARBLER. 



Balicaria turdina orientalis TEMMINCK and SCHLEGEL, Fauna Japonica, 



Aves (1850), 50. 

 Acrocephalus orientalis SEEBOHM, Cat. Birds Brit. Mus. (1881), 5, 97; 



WHITEHEAD, Ibis (1899), 210 (migration) ; SHABPE, Hand-List (1903), 



4, 187; GATES and REID, Cat. Birds' Eggs (1905), 4, 183; MCGREGOR 



and WORCESTER, Hand-List (1906), 87. 



Batan (McGregor) ; Bohol (McGregor) ; Calayan (McGregor) ; Cebu (Meyer, 

 Steere Exp., McGregor) ; Luzon (Meyer, Whitehead, McGregor) ; Mindanao 

 (Steere Exp., Goodfellow) ; Mindoro (Bourns & Worcester, McGregor) ; Palawan 

 (Platen). Japan, northern China, and eastern Siberia; in winter to Burmese 

 provinces and the Malay Archipelago. 



Adult male and female. Above nearly uniform olive-brown; feathers 

 of back, tail-coverts, and wing-coverts somewhat fringed with ocherous 

 buff; primaries, secondaries, and rectrices dark brown, edged with olive- 

 brown; second primary with a whitish outer web; below white, washed 

 with buff; chin and throat nearly pure white; breast pale buff; sides, 

 flanks, thighs, and crissum considerably darker; lores and spot behind 

 eye brown; eyelids pale buff; a line from nostril over lores and eye to 

 occiput pale buff; feathers of lores and jaws with produced black shaft- 

 tips. The obscure dusky streak on throat and the pale tips to the 

 rectrices, frequently seen in Philippine specimens, are said to be character- 

 istic of birds of the year. Length, about 190. A male in fresh plumage 

 from Calayan measures: Wing, 85; tail, 77; culmen from base, 19; bill 

 from nostril, 13; tarsus, 26. A female from Calayan, wing, 80; tail, 

 68 ; culmen from base, 18 ; bill from nostril, 13 ; tarsus, 24. 



This species is resident in Bohol and specimens from that island are 

 smaller than those taken in Calayan and in Luzon during migration. 



Genus TRIBURA Hodgson, 1845. 



"Bill to gape equal to head or less, straight, cylindric, compressed; at 

 base higher than broad, and having the ridge raised and keeled between 

 the oval apert nares ; tip of upper mandible scarcely inclined but distinctly 

 notched; rictus smooth; wings short and feeble but not much or equally 

 gradated; first two quills conspicuously gradated, three next subequal 

 and longest; tail more or less elongated and gradated throughout, rather 

 cuneate than fan-shaped and somewhat rigid or worn; tarsi stout, smooth, 

 longer than the mid toe and nail; toes and nails simple, compressed, 

 inner fore with its nail exceeding the outer fore, central elongate, hind 

 least; nails acute." (Hodgson.) 



