Hypothymis Boie, Isis, 1826, p. i)73. Type, H. occipitalis.
In Hypothymis the bill is like that of Terpsiphone but smaller and is covered at the base with dense plumules; the rictal bristles are numerous and long; the tail slightly rounded but without lengthened central rectrices. The sexes are dissimilar.
The genus Hypothymis is represented by one species in India which extends over the whole of Ceylon, India, Burma, the Indo-Chinese countries to Hainan, the Philippines, Borneo, Sumatra and Java.
Both Stresemann and Oberholser have recently reviewed this species and have created numerous subspecies, specimens of some of which, including nicobarica (=calocara) and idiochroa, are unfortunately not in the British Museum.