Promecotheca bryantiaePromecotheca bryantiae is a species of beetle of the family Chrysomelidae. It is found on the Solomon Islands.DescriptionAdults reach a length of about 8.2 mm. They are reddish to metallic purplish, with a mostly pale head. The elytra are metallic purplish, but pale on the base and along the basal portion of the suture.Life historyThe recorded host plants for this species are Pandanus species. The larvae mine in the sides of the leaves of their host plant, with each mine containing four or more larvae.