This species is listed as Critically Endangered in the IUCN Red List of Threatened Species (https://www.iucnredlist.org/).

This is also known as the Black-capped Sibia.
 

Subspecies nigroauritus, which ranges north of the Brahmaputra River, has black ear-coverts. In the nominate subspecies, which occurs south of the Brahmaputra River, black is restricted around the eye, to lores (Grimmett et al. 2011).