Pachycnema abdominalis is a species of beetle of the family Scarabaeidae. It is found in South Africa (Northern Cape).
Adults reach a length of about . They are black, clothed on the head, pronotum and scutellum with long, black hairs interspersed in males with greyish-white ones. The abdomen and pygidium are clothed with white scales. The elytra are light testaceous brown, edged all round, and also along the suture, with a fuscous band, along the posterior part of the suture there is a narrow line of silvery-white scales. The legs are black.