Serianus sp. 2 [aff. bolivianus (Beier, 1939)]

New record. TUCUMAN: Tafi del Valle, 2050 m, 6.VI.2009, Turienzo & Di Iorio leg., 2 3, 1 Ƥ (MHNG), inside a nest of Phacellodomus striaticeps (Orbigny & Lafreysnaye, 1838) (Aves: Furnariidae).

Note. The differences between these two species are emphasized in the key; one of them might represent the following undescribed species, which is awaiting description (Ceballos 2002; Ceballos & Rosso de Ferradás 2008a).