Oriolus Linn,, Syst. Nat., 12th ed., i, p. 160 (1766). Type, Oriolus galbula (=0. Oriolus).
This genus comprises five Indian species of birds, some of which are known over the greater part of India under the trivial name of " Mango bird." The prevailing colour of this genus is yellow and black, in one species only being red and black. The young are densely streaked below and retain traces of these streaks in their plumage for some time, the males until the end of their second year and the females for longer still.
In this genus the bill is about as long as the head, the culmen is generally curved and the tip notched and bent; the nostrils are lengthened and exposed; the rictal bristles are fairly strong; the head is never crested; the wing is long and pointed," with the first primary longer than half the second; the tail is much shorter than the wing and slightly graduated : the tarsus is short and scutellated.
Key to Species.
A. General colour black and yellow.
a. Crown yellow or greenish yellow; nape black ………….O. chinensis, p. 7.
b. Both nape and crown yellow or greenish yellow.
a1. Wing over 130 mm O. Oriolus, p, 5,
b1. Wing under 120 mm O. xanthonotus, p. 13.
c. Whole nape and crown black.
c1. Abdomen white or yellowish white streaked with black………..O. xanthonotus, , p. 13.
d1. Abdomen plain yellow O. xanthornus, p. 11.
B. General colour black and red O. traillii, p. 14.