Diomus jocosus is a species of beetle of the family Coccinellidae. It is found in Australia (central and northern New South Wales, Queensland).
Description Adults reach a length of about . The head and most of the pronotum, as well as the ground colour of the elytra are black. The anterior margin of the pronotum is yellow. The elytra have four spots. The dorsal surface is covered by silvery pubescence.
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