Decadiomus hughesi is a species of beetle of the family Coccinellidae. It was described from Bermuda, but is problably an introduced species.
Adults reach a length of about 1.15âÂÂ1.6 mm. Adults are black, although the pronotum is reddish yellow with a black basal spot. The basal, sutural and lateral margins of the elytron are black.
They prey on mealybugs, including Pseudococcus longispinus, Icerya purchasi, Coccus viridis and Carulaspis minima.