Precis pelarga has a wingspan reaching about 43–51 millimetres (1.7–2.0 in). The forewings are falcate. A clearer band crosses the forewings and hindwings. This band is orange-white in the wet season, bluish white in the dry season (seasonal polymorphism). The basal area of the wings is brown, while the margins are blackish, with a series of small white spots. The undersides of the wings are variegated, with yellowish-brown cryptic colours, mimicking dead leaves. Larvae feed on Solenostemon and Coleus (Lamiaceae species).