The genus Hilarocichla was created by Oates for a species very close to Pteruthius but differing in its much longer tail. This is equal to the wing in length and is greatly graduated, the outermost feather being about one-third less than the central ones. In other respects Hilarocichla and Pteruthius are alike.
The Fauna Of British India, Including Ceylon And Burma-birds(second Edition)
Baker, EC S (1922–1930) The fauna of British India including Ceylon and Burma. Second edition. vol.1 1922.
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