Extreme north-western Argentina (Jujuy, Salta), western and eastern Bolivia (south-western La Paz, and from Santa Cruz southern along base of Andes), eastern Paraguay (east of R Paraguay) and south-central and eastern Brazil (southern Mato Grosso, Mato Grosso do Sul, extreme western Paraná and Sío Paulo north to Maranhío and Rio Grande do Norte).
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is unknown (2010).
Black-capped Antwren (Herpsilochmus atricapillus) [XC186372]
by Niels Poul Dreyer from Porto Ferreira, S\u00e3o Paulo, Brazil (song)
Black-capped Antwren (Herpsilochmus atricapillus) [XC255979]
by Jeremy Minns from Goiatuba, Goi\u00e1s, Brazil (song)
Subspecies
Until recently treated as conspecific with Caatinga Antwren (Herpsilochmus sellowi) and Bahia Antwren (Herpsilochmus pileatus). These three are considered to belong to a clade that also includes Creamy-bellied Antwren (Herpsilochmus motacilloides) and Ash-throated Antwren (Herpsilochmus parkeri). Although no geographical subspecies described, plumage and vocal variations exist across its extensive range. Further research is required.
BirdLife International Species Factsheet