Diomus obumbratus is a species of beetle of the family Coccinellidae. It is found in Australia (New South Wales, southern Queensland).
Description Adults reach a length of about . The head is yellowish, while the rest of the body is light brown with the pronotum (except for the anterior and lateral areas) darker than the elytra. The dorsal surface is covered by yellowish pubescence, forming wavy patterns on the elytra.
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