Diomus norfolcensis is a species of beetle of the family Coccinellidae. It is found in Australia (Norfolk Island, Phillip Island).
Description Adults reach a length of about . The head, antennae, legs, and anterior corners of the pronotum are yellowish, while the elytra and the rest of the pronotum are dark brown to black. The dorsal surface is shiny with silver setae, forming a wavy pattern on the elytra.
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