Ardea imperialis Stuart Baker.
Ardea imperialis Stuart Baker, Bull. B. O. C, vol. xlviii, p. 470, 1928 : Sikkim, Terai.
Ardea insignis Stuart Baker, ex Hume, Str. Feath., vol. vi, p. 470, 1870; not Ardea insiynis Hodgs., Zool. Misc., p. 86, 1844, nom. nud. cited as synonym of nobilis Blyth, by Gray, Cat. Birds Nepal, p. 133, 1846, and as a synonym of sumatrana Raffles, by Gray, Hand-l. Gen. Sp. Birds, pi. iii, p. 27, 1871.