This unfortunate bird has been one of the greatest sufferers from the exigencies of modern nomenclature. Known for many years as Oriolus melanocephalus, Hartert then discovered that this name was antedated by another given to the same bird by Linnaeus in 1758, whilst recently it has been discovered that yet a third name existed given by Linnaeus in the same 10th ed. of his work on a previous page.
As thaiacous of Hartert cannot be maintained, there are only two races known of this widely-spread species.
Key to Subspecies.
A. Larger, wing always over 130 mm O. x. xanthornus, p. 11.
B. Smaller, wing never exceeding 130 mm. O. x, ceylonensis, p. 12.