Amblymelanoplia cavitibialis is a species of beetle of the family Scarabaeidae. It is found in South Africa (Western Cape). The habitat consists of Knersvlakte Shale Vygieveld.
Adults reach a length of about 9.5 mm. They are dull black. The head and clypeus have brown setae, while the pronotum has pale-brown and brown setae and a band of white scales along the lateral margin and some short black setae on the lateral margin. The elytra have brown setae and white scales.