Niltava Hodgs., Ind. Rev., i, p. 650 (1837). Type, Niltava sundara Hodgs.
The genus Niltava contains three species of Flycatcher remarkable for the brilliant plumage of the males. The sexes differ in colour, but both may be recognized by the presence of a brilliant blue spot on either side of the neck. Cyornis oatesi and C. sumatrensis, though rather similarly coloured as regards the males, have females without any blue neck-spot.
In Niltava the bill is rather narrow and somewhat compressed laterally and the base is covered by numerous, dense plumelets, almost concealing the nostrils; the rictal bristles are moderate in length and number; the first primary is large, being at least half the length of the second; the tail is slightly rounded.
Key to Species.
A. Wing- always over 95 ram N. grandis p. 257.
B. Wing always under 95 mm.
a. Under wing-coverts and axillaries chest-
nut or buff; wing over 75 mm N. sundara, p. 259.
b. Under wing-coverts and axillaries white
or ashy-white, wing under 70 mm. .. N. macgrigoriae, p. 260.