Diomus kioloa is a species of beetle of the family Coccinellidae. It is found in Australia (New South Wales).

Description Adults reach a length of about . The head, antennae, legs and pronotum are orange or brown, the latter with a black median area. The elytra are dark brown or black with the apices a bit lighter. The dorsal surface is covered by whitish pubescence, forming wavy patterns.

Etymology The species is named after the type locality, the Kioloa state forest in New South Wales.

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