Diomus tenebricosus is a species of beetle of the family Coccinellidae. It is found in Australia (Australian Capital Territory, Northern Territory, South Australia).
Description Adults reach a length of about . The head and a band along the anterior edge of the pronotum are yellowish or orange, while the rest of the pronotum and elytra are dark brown to black, often with a vague reddish apical area. The antennae and legs are yellowish-brown. The dorsal surface is covered by whitish pubescence, forming wavy patterns on the elytra.
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