Genetic studies have suggested that these subspecies may represent separate species, but further research is needed.

[2] The black-throated bushtit is a small passerine, around 10.5 cm long and weighing 4-9 g.[2] There is considerable racial variation in the plumage, but all subspecies have a medium length tail (as opposed to the long tail of the related long-tailed tit), a black throat and a black 'bandit mask' around the eye.

The nominate race has a chestnut cap, breast band and flanks and dark grey back, wings and tail, and a white belly.

[2] Disjunct populations also occur in southern Vietnam, the island of Hainan and further north in China up to the Yellow River.

The black-throated bushtit is highly social and will travel in large flocks of up to 40 birds.