700 MANUAL OF PHILIPPINE BIRDS. 
feeding is absolutely unmistakable, and can be heard for a considerable 
distance. ‘They feed for the most part in the tops of high trees, seldom 
coming down into the second arth. They can, however, be readily 
called by imitating their note. 
“Kleven males average: Length, 192; wing, 111; tail, 71; culmen, 
23.8; tarsus, 21; middle toe with claw, 23. Five females, length, 182; 
wing, 105; tail, 71; culmen, 23.6; tarsus, 20; middle toe with claw, 22. 
Iris varies from gray to brown and red; legs and feet dark drab, nails 
black; bill light reddish brown.” (Bourns and Worcester MS.) 
713. ORIOLUS CINEREOGENYS Bourns and Worcester. 
GRAY-CHEEKED ORIOLE, 
Oriolus cinereogenys BoURNS and WoRrcESTER, Minnesota Acad. Nat. Sci- 
Oce. Papers (1894), 1, 16; Proc. U. S. Nat. Mus. (1898), 20, 558, no. 
304 (Tawi Tawi and Bongao). 
Bongao (Hverett) ; Tawi Tawi (Bourns & Worcester, Everett). 
“In uniting the Tawi Tawi birds with O. steerw [basilanicus| from 
Basilan and Mindanao, Dr. Sharpe has evidently overlooked the fact that 
the Tawi Tawi birds invariably have the cheeks and ear-coverts clear ashy 
gray, while in birds from Basilan and Mindanao they are just as invariably 
olive-green. As we find no exception to this rule among our fourteen 
specimens from Basilan and twenty from Tawi Tawi we have no hesi- 
tation in separating the birds from the latter locality. It may be added 
that the rump of the Tawi Tawi birds is rather brighter, and the throat 
decidedly lighter than in Basilan birds. Not one of our Tawi Tawi birds 
shows the uniform gray throat of O. steer [basilanicus]. Both species 
show great variability in the color of under tail-coverts. In some speci- 
mens they are pure yellow and in others heavily streaked with black. 
Fifteen males from. Tawi Tawi measure as follows: Length, 203; culmen, 
24.3; wing, 116.5; tail, 81; tarsus, 21.” (Bourns and Worcester.) 
“Four females average: Length, 200; wing, 111; tail, 76; culmen, 
23.3; tarsus, 21; middle toe with claw, 21.8. Eyes usually reddish 
brown, but in two cases gray; legs and feet dark drab; hill reddish brown 
usually, in two cases black. Very common near Tataan, in Tawi Tawi.” 
(Bourns and Worcester M8.) 
714. ORIOLUS ASSIMILIS Tweeddale. 
CEBU ORIOLE, 
Oriolus assimilis TwEEDDALE, Proc. Zool. Soc. (1877), 760, pl. 76 Me- 
GRrEcorR and Worcester, Hand-List (1906), 107; McGrecor, Phil. Jour. 
Sei. (1907), 2, sec. A, 308. ; 
Cebu (Hverett, Bourns & Worcester, McGregor). 
Adult (sexes similar).—Above olive-yellow; lores, jaw, cheeks, chin, 
throat, and chest cinereous; lower breast, abdomen, flanks, and thighs 
