Diomus capital is a species of beetle of the family Coccinellidae. It is found in Australia (Australian Capital Territory).
Description Adults reach a length of about . The head and anterior margin of the pronotum are orange, while the rest of the pronotum and elytra are dark brown to black, the latter usually with a reddish pattern. The dorsal surface is covered by silvery pubescence.
Etymology The species name refers to its type locality in Canberra, the capital city of Australia.
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