Amblymelanoplia bicostata is a species of beetle of the family Scarabaeidae. It is found in South Africa (Western Cape).
Adults reach a length of about 9.2 mm. They are dull black, with the antennae dark red-brown. The clypeus has short pale-brown setae, while the setae on the head are short and black. The pronotum has short brown setae and black setae of various lengths. The elytra have short, pale-brown setae.
The species name is derived from Latin costa (meaning a rib) and refers to the two costae on the elytra.