CHIBIA. 705 



D. borneensis in having a larger bill and longer tail." (Hartert.) 

 Measurements of this species are given as follows: "Wing, 145 to 155; 

 tail, 133 to 136 ; bill, 34 to 36." 



719. DICRURUS MIRABILIS Walden and Layard. 

 WHITE-BELLIED DBONGO. 



Dicrurus mirabilis WALDEN and LAYARD, Ibis (1872), 103, pi. 5; SHARPE, 

 Cat. Birds Brit. Mus. (1877), 3, 231; WHITEHEAD, Ibis (1899), 101 

 (voice) ; MCGREGOR and WORCESTER, Hand-List (1906), 107. 



Ca-uac-uac, Ticao. 



Bantayan (McGregor) ; Cebu (Everett, McGregor) ; Guimaras (Steere Exp.) ; 

 Masbate (Steere Exp., Bourns d Worcester, McGregor) ; Negros (Layard, Meyer, 

 Steere, Everett, Steere Exp., Bourns & Worcester, Whitehead, Celestino) ; Panay 

 (Steere Exp., Bourns & Worcester) ; Ticao (McGregor). 



Adult (sexes alike).-. Black, glossed with steel-green like D. bali- 

 cassius, but lower breast, abdomen, and crissum pure white. A male 

 from Ticao Island measures: Length, 280; wing, 142; tail, 121; 

 bill from nostril, 23; depth of bill at nostril, 11.5; tarsus, 13. A fe- 

 male from the same island, wing, 137; tail, 120; bill from nostril, 21; 

 depth of bill at nostril, 11 ; tarsus, 24. 



"Bourns thought that he saw an individual of this species in Siquijor 

 on one occasion, but he failed to secure it, and it was not again met with 

 in the island. If it occurs there, it must be very rare. It is rather 

 more shy than the other Philippine representatives of the genus. 



"Four males from Cebu average: Length, 260; wing, 137; tail, 117; 

 culmen, 33 ; tarsus, 23 ; middle toe with claw, 25. Five females, length, 

 260; wing, 137; tail, 119; culmen, 33; tarsus, 23; middle toe with claw, 

 25. Specimens from other localities agree closely in dimensions with 

 the above. Bill, legs, feet, and nails black. Food insects. Breeding 

 in June and July." (Bourns and Worcester MS.) 



Genus CHIBIA Hodgson, 1836. 



Tail deeply forked, outermost pair of rectrices with the tips curved 

 upward and more or less rotated. Plumage entirely black, glossed with 

 green and blue; back velvety black with little or no blue gloss; breast 

 black, spangled with glossy steel-green. 



Species. 

 a 1 . Tail shorter than wing. 



V. Tips of outer rectrices less .recurved. 



c 1 . Smaller; wing, about 135 mm. palawanensis (p. 706) 



c*. Larger; Wing, about 150 mm. 



d\ Bill larger , cuyensis (p. 706) 



a 2 . Bill smaller borneensis (p. 707) 



&'. Tips of outer rectrices more recurved; wing, 150 mm Worcester! (p. 707) 



a*. Tail much longer than wing; outermost rectrices longer than the next pair 

 by about twice the tarsus menagei (p. 708) 



