Brachiacantha isthmena is a species of beetle of the family Coccinellidae. It is found in Costa Rica and Panama.
Description Adults reach a length of about . The dorsal colour is black or dark brown, with the pronotum almost completely yellow. Each elytron has three or four yellow spots. The male abdomen has a setal tuft on the first ventrite and several ventrites emarginated and depressed.
Etymology The species name refers to the Panamá isthmus.
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