The subgenus Brachypolemius Wittmer, 1950, of the genus Polemius LeConte, 1852, included only one species from Bolivia, P. (B.) dimorphus Wittmer, 1950. Two new species from Peru are assigned to this subgenus: Polemius (Brachypolemius) antauta n. sp. (Puno) and P. (Brachypolemius) rodriguezae n. sp. (Junin). Another new brachelytrous Silinae is described in the genus Discodon Gorham, 1881: D. huancavelica n. sp. (Huancavelica). Illustrations of habitus, main morphologic characters, male genitalia, keys to genera and species, and a distribution map are provided.