An adult thrush trapped in a mist-net near Guayaramerin, dpto. Beni, Bolivia, in April 2005, was initially identified as Black-billed Thrush Turdus ignobilis although several subtle plumage features appeared to differ from the expected race T. i. debilis. These features match those of Campina Thrush T. arthuri, a cryptic species subsequently split from Black-billed Thrush based on molecular evidence, and now known to occur widely in shrubby thickets and stunted campina forest across much of Amazonia. This record extends the known distribution of T. arthuri south-west from the nearest known localities in Amazonas and Rondônia, Brazil. T. arthuri is presumably resident in north-west dpto. Beni in suitable habitat, and potentially occurs elsewhere in Bolivia from Pando to eastern Santa Cruz in similar campina-like habitats associated with weathered outcrops of the Brazilian Shield.