Scymnodes magnus is a species of beetle of the family Coccinellidae. It is found in Papua New Guinea.
Description Adults reach a length of about . They have an elongate-oval body. The head is reddish testaceous and the pronotum is testaceous with a black marking. The elytra are black with metallic bluish violet reflections and with the apical area testaceous. The ventral surface is black, but the antennae are testaceous.
Etymology The species name refers to the large size of the species.
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