Peritrichia dubia is a species of beetle of the family Scarabaeidae. It is found in South Africa (Western Cape).
Adults reach a length of about . They are black, with a blurred reddish-brown translucent, small disc-shaped spot on the elytra. The anterior margin of the pronotum is white and there are white spots on the sides of the propygidium and pygidium, as well as a grey comb of hairs on the hind tibiae.