We provide new information on Neotropical Phyllocnistis Zeller (Gracillariidae) associated with Baccharis (Asteraceae) in the Andes region. Two new species are described, P. canta Cerdea Farfn, n. sp. and P. elongata Cerdea Farfn, n. sp., from the western slopes of the Andes of Peru between 2,000 and 3,000 m elevation, both associated with Baccharis latifolia (R.P.) Pers. The type locality of P. baccharidis Hering is confirmed; immature stages were found at 1,300 m feeding on Baccharis tucumanensis Hook. Arn. in Quebrada las Higueras (Tucumn, Argentina). Four new locality records for P. furcata Vargas Cerdea are provided, extending its distribution by 450 km to the north of the type locality.