China (mainland) (B) (NB), India (B) (NB), Myanmar (B) (NB).
North-eastern India from eastern Arunachal Pradesh (Mishmi Hills) south to Assam (northern Cachar, Margherita), Nagaland and northern Manipur; northern Myanmar and adjacent southern China (north-western Yunnan).
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 2,500 - 9,999 (2011) and decreasing.
Cachar Wedge-billed Babbler (Stachyris roberti) [XC157936]
by George Wagner from Mishmi Hills, rd up to Muyudia hotel, Arunachal Pradesh, India (song)
Cachar Wedge-billed Babbler (Stachyris roberti) [XC157928]
by Frank Lambert from Mishmi Hills, nr Tawarigaon (1), Arunachal Pradesh, India (song)
Subspecies
Sphenocichla humei (Sibley and Monroe 1990, 1993) has been split into Blackish-breasted Babbler (Stachyris humei) and Chevron-breasted Babbler (Stachyris roberti) following Collar (2006).
Formerly treated as conspecific with Blackish-breasted Babbler (Stachyris humei) but song is different.
No subspecies.
Similar Species
Blackish-breasted Babbler (Stachyris humei) which is slightly larger and lacks bold white triangular scales, and has a sharper-tipped bill.
References
See References.