1080. Chaetura leucopygialis.
The Grey-rumped Black Spine-tail.
Acanthylis leucopygialis, Blyth, J. A. S. B. xviii, p. 809 (1849); id. Cat. p. 85; id. Ibis, 1866, p. 339. Acanthylis coracinus, Mull. Bonap. Consp. Av. p. 64 (1850). Chaetura coracina, Sclater, P. Z. S. 1865, p. 614; Hume, S. F. iii, p. 318; Hume Dav. S. F. vi, p. 45 Chaetura leucopygialis, Hume, S. F. vii, p. 518; id. Cat. no. 95 bis; Hartert, Cat. B. M. xvi, p. 490. Rhaphidura leucopygialis, Oates, B. B. ii, p. 6.
Coloration. Black, with a bluish gloss throughout, above and below, except the rump and long upper tail-coverts, which are greyish white (pearly grey) with narrow black shafts.
Bill black ; irides dark brown; legs and feet livid purple.
Length about 4.75; tail 1.7 ; wing 4.9 ; tarsus .4. The upper tail-coverts extend to the end of the webs of the tail-feathers; the naked shafts of the latter project .3 to .4 inch.
Distribution. The extreme south of Tenasserim, ranging throughout the Malay Peninsula to Sumatra and Borneo.
Habits, &c. very similar to those of C. sylvatica, but by Davison's account this appears to be a swifter bird.