594 MANUAL OF PHILIPPINE BIRDS. 



third and equal to sixth; the fourth longest; rectrices well developed, 

 tail slightly rounded. 



Genus ORIOLUS Linnaeus, 1766. 



Characters the same as those given for the family. In the Philippine 

 species the prevailing colors are yellow, black, and gray; the rectrices 

 are black, tipped with yellow in all the species. 



Species. 



a 1 . Under parts entirely yellow, or yellow streaked with black or olive; throat 



and chest never black nor gray. 



6 1 . Much larger; wing more than 140 mm.; tail, about 110; under parts uniform 

 yellow (adult), or with black shaft-lines on the breast (young). 



acrorhy nchus ( p. 695 ) 



ft 2 . Much smaller; wing less than 130 mm.; tail, 90 or less. 

 c 1 . Lores and chin yellow; bill leaden blue; bill from nostril, about 18 mm. 



Isabella (p. ; 

 c 2 . Lores and chin white; bill dull red; bill from nostril, about 15 mm. 



albiloris (p. iii7 > 

 a 2 . Under parts yellow on crissum only ; throat and chest gray, black, or streaked ; 



abdomen white heavily streaked with black. 

 ft 1 . Crown and hind neck bright yellow, or greenish yellow, uniform with mantle 



and back (sexes alike). 

 c 1 . Crissum bright yellow; shafts of rectrices light yellow below, inner webs 



broadly tipped with yellow, the spots 8 mm. or more in length. 

 d l . Inner webs of wing-quills edged with bright yellow; under wing-coverts 



bright yellow samarensis (p. 698) 



d 2 . Inner webs of wing-quills edged with white, pale gray, or pale yellow, 



never with bright yellow. 

 e 1 . Inner webs of quills edged with white or pale gray; yellow spots at 



tips of rectrices larger steeri (p. 698) 



e 2 . Inner webs of quills edged with pale yellow; spots at tips of rectrices 



smaller. 

 f 1 . Ear-coverts dull olive-yellow; smaller; wing, about 110 mm.; tail, 



70 basilanicus (p. (i'.i'.i > 



f. Ear-coverts pure gray; larger; wing, about 115 mm.; tail, 80. 



cinereogenys (p. 700) 



c 2 . Crissum dark greenish yellow; rectrices nearly uniform black, very nar- 

 rowly tipped with yellow, the spots about 2 mm. in length; the shafts 



white or gray assimilis (p. 700) 



ft 2 . Crown and hind neck black (male), or black streaked with olive-green 

 (female), in contrast with the yellow mantle and back. 



xanthonotus (p. 701 ) 



