Renius is a genus of beetle of the family Coccinellidae. It is monotypic, being represented by the single species, Renius cornutus, which is found in India (Arunachal Pradesh, Assam) and China (Tibet).
Description Adults reach a length of about . The head is bluish black, while the rest of the dorsal surface is dark blue. The ventral surface is bluish black with yellow legs and a brownish black abdomen.
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