Diomus tetricus is a species of beetle of the family Coccinellidae. It is found in Ecuador.
Description Adults reach a length of about 2.1 mm. Adults are black with a light brown pronotum and yellow to brown legs.González, G., 2015. Especies nuevas y nuevos registros de coccinélidos (Coleoptera: Coccinellidae) de Ecuador. Boletín de la Sociedad Entomológica Aragonesa 57: 143–163.
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