Bolivia (locally in northern Beni, northern Santa Cruz) and south-central and north-eastern Brazil (central Mato Grosso east to Tocantins and Goiás, extending north-eastern locally to southern Ceará and southern Piauí, and south to western Paraná and western Sío Paulo).
 
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).
Large-billed Antwren (Herpsilochmus longirostris) [XC304391]
by Breno Dias Vitorino from Tr\u00eas Lagoas, Mato Grosso do Sul, Brazil (song)
Large-billed Antwren (Herpsilochmus longirostris) [XC838068]
by JAYRSON ARAUJO DE OLIVEIRA from Condom\u00ednio Mans\u00f5es do Araguaia - Nova Crix\u00e1s, Goi\u00e1s, Brazil (call, song)
Subspecies
Thought to be most closely related to Pectoral Antwren (Herpsilochmus pectoralis) on basis of plumage and distribution, although vocalizations not closely similar.