Peritrichia ypsilon 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. Males have black elytra, while these are brown in females. There is a white, Y-shaped marking on the pronotum, which also has a white border. The elytra are covered with scattered white scales, short white hairs and widely spaced, long, black hairs.