Trachyserica is a genus of beetle of the family Scarabaeidae. It is monotypic, being represented by the single species, Trachyserica longitarsa, which is found in Madagascar.
Adults reach a length of about 5 mm. They have a narrow, shiny, dark brown body, with a somewhat metallic sheen. There are scattered setae on the elytra and more densely packed setae at the tarsal joints.