Eastern slope of Andes of Peru in San Martín, La Libertad, Amazonas (Kuelap), and Huánuco (east of R Huallaga near Panao, and west to Cordillera Carpish).
 
Population
Estimated population is unknown (2010).
Pardusco (Nephelornis oneilli) [XC142107]
by Ross Gallardy from Ridge beyond Bosque Unchog, Huanuco, Hu\u00e1nuco Region, Peru (call)
Pardusco (Nephelornis oneilli) [XC812298]
by id from Huicungo, Mariscal C\u00e1ceres Province, San Martin, Peru (song)
Subspecies
No subspecies.
Taxonomic affinities initially unclear, and had been suggested as being closely related to New World warblers (Parulidae). However, investigations of cytochrome b sequence data indicate that it is related to a clade of mostly Andean tanagers in genera Hemispingus, Cnemoscopus, Pyrrhocoma, Thlypopsis and Cypsnagra.