Maechidius caperatus is a species of beetle of the family Scarabaeidae. It is found in Indonesia (Irian Jaya), where it occurs in lowland rainforests at about 750 meters altitude.
Adults reach a length of about 8.15 mm. The dorsum and venter are uniformly black, while the edges of the labroclypeus, legs and antennae are dark brown.
The species name is derived from Latin caperatus (meaning wrinkled) and refers to the irregularly wrinkled pattern of the pronotum and elytra.