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) [XC41679]
by Willem-Pier Vellinga from Bosque Unchog, Huanuco, Peru (call)
Pardusco (Nephelornis oneilli) [XC62945]
by Charles Hesse from Santa Barbara, Sector San Martin, PN Yanachaga-Chemillen, Pasco, Peru (call)
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.