572 MANUAL OF PHILIPPINE BIRDS. 



553. TRIBURA SEEBOHMI (Grant). 

 SEEBOHM'S GRASS WARBLER. 



Lusciniola seebohmi GRANT, Bull. Brit. Orn. Club. (1895), 4, 40; Ibis 

 (1895), 443; WHITEHEAD, Ibis (1899), 211 (habits). 



Tribura seebohmi SHABPE, Hand-List (1903), 4, 191; MCGREGOR and WOR- 

 CESTER, Hand-List (1906), 88. 



Luzon (Whitehead). 



"Seebohm's grass warbler belongs to the section of the genus Lus- 

 ciniola in which the first primary is half or more than half the length 

 of the second, the sides of the head and ear-coverts brown, the throat 

 pure white and devoid of spots, and the tail considerably longer than 

 the wing. 



"Clearly the nearest allies to this species are L. luteiventris and L. 

 mandellii. In these three species the wing-formula is as follows: 



"L. luteiventris. Fourth quill slightly longer than, rarely subequal 

 to, the fifth; third intermediate between fifth and sixth. 



"L. mandellii, L. seebohmi. Fifth somewhat longer than the fourth 

 and sixth, which are subequal, and distinctly longer than the third. 



"The present species differs from both its allies in having the general 

 color of the upper parts browner, the white on the chin and throat more 

 extensive and shading into grayish on the sides of the neck; while the 

 sides and flanks are more grayish brown in tint and but slightly washed 

 with buff; the lower mandible appears to have been yellowish white, as 

 in L. luteiventris. Length, 147 ; wing, 51 ; tail, 63.5 ; tarsus. ->n ; middle 

 toe with claw, 19." (Grant.) 



Genus ORTHOTOMUS Horsfield, 1821. 



Bill long, depressed basally, compressed near the tip, with no notch 

 at tip of mandible; rictal bristles few and moderate in length; no 

 bristles on forehead; chin-feathers without lengthened shafts; wing 

 short, rounded, and curved to the body ; first primary less than one-half 

 second, the latter considerably shorter than the fourth; fifth, sixth, and 

 seventh subequal and longest; secondaries but little shorter than pri- 

 maries; rectrices long, narrow, strongly graduated, and their tips 

 rounded; tarsus about equal to culmen from base; outstretched feet 

 usually reaching to, or beyond, the tip of tail; colors largely green, 

 chestnut, gray, and white; or green, black, and gray or yellow. 



Species. 



a 1 . Top of head, or the forehead at least, chestnut. 



ft 1 . Chin, throat, and ear-coverts white, or gray streaked with white, 

 c*. Back bright olive-green. 



d 1 . Chestnut of head confined to frontal and circumocular regions, not 



extending to occiput. 

 e\ Chestnut of forehead sharply defined posteriorly; crown gray. 



frontalis (p. 573) 



