This is a male. Females are browner with less white in the wing coverts. This species was first described by Gould in 1838 based on a specimen from Norfolk Island south of New Caledonia where it is now extinct. It was last seen there in 1942 although reportedly abundant a year before. The extinction was apparently caused by a combination of the clearing of a large area of native forest for the construction of an airport combined with introduction of the Black Rat which arrived on the island in the 1940s. Here in New Caledonia, we still find the endemic subspecies L. l. montrosieri characterized by more white on wing coverts, grayish-white rump (top photo) and faint buff on belly (visible in bottom photo). Other subspecies occur on San Cristobal (Makira) and Vanuatu. Canon PowerShot SX60.
References:
Department of the Environment (2019). Lalage leucopyga leucopyga in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Sun, 8 Dec 2019 12:30:33 +1100.
Dutson, G. (2011) Birds of Melanesia, Christopher Helm, London.
Taylor, B. (2019). Long-tailed Triller (Lalage leucopyga). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/57895 on 8 December 2019).