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Cettia is a genus of small insectivorous songbirds which make up the core of the family Cettiidae.

Cettiidae is a newly validated family of small insectivorous songbirds ("warblers"), formerly placed in the Old World warbler "wastebin" assemblage. It contains the typical bush warblers (Cettia) and their relatives. As a common name, cettiid warblers is usually used.

Cettiidae: Cettia from Francesco Cetti.

Hemitesia is a genus of small insectivorous songbirds which make up the core of the family Cettiidae.

1/ Pale-footed bush warbler (Chích Vân Nam, Hemitesia pallidipes)
pallidipes combines the Latin pallidus meaning "pale" with pes meaning "foot".

Cettiidae: Cettia from Francesco Cetti.
The name Hemitesia combines the Ancient Greek hēmi- meaning "half-" or "small" with the genus Tesia.
Tesia Nepalese name Tisi for the Grey-bellied Tesia Tesia cyaniventer.

Horornis is a genus of small insectivorous songbirds ("warblers") which make up the core of the newly recognized family Cettiidae. 

Tesia is a genus of Old World warbler in the family Cettiidae.
The genus is from the Nepalese word Tisi for the grey-bellied tesia.

1/ Slaty-bellied Tesia/Warbler (Chích đuôi cụt, Tesia olivea)
2/ Grey-bellied Tesia/Warbler (Chích đuôi cụt bụng xám, Tesia cyaniventer)

The chestnut-headed tesia was formerly included in the genus. 
A molecular phylogenetic study found that the chestnut-headed tesia (Chích đuôi cụt bụng vàng) belongs to the genus Cettia, bush warbler. 
The species was moved but retained the same common name or sometimes referred to as Cettia castaneocoronata abadiei.

Tickellia belongs to the monotypic genus Tickellia, of bush warbler in the family Cettiidae.

1/ Broad-billed Warbler (Chích mỏ rộng, Tickellia hodgsoni)