1385. Turnix albiventris.
The Nicobar Button-Quail.
Turnix albiventris, Hume, S. F. i, p. 310 ; ii, p. 281; iv, pp. 279, 293 ; id. Cat. no. 834 ter; Hume & Marsh. Game B. ii, p. 199, pl. ; Ogilvie Grant, Ibis, 1889, p. 467; id. Cat. B. M. xxii, p. 545.
Coloration. Similar to that of T. tanki, except that adults retain much of the black and rufous barring and mottling on the dorsal feathers ; the feathers on the sides of the crown are black with rufous edges ; and the collar in the female bird is much deeper ferruginous, chestnut in fact. Immature birds are undistinguishable from those of T. tanki, and the soft parts are similarly coloured in birds of all ages.
Length of female 6.5 ; tail 1.3 ; wing 3.1 ; tarsus .9 ; bill from gape .7. Males rather smaller.
Distribution. Common in the Nicobar Islands in long grass; rare in the Andamans, which are mainly covered with forest.