Timarcha is a beetle genus of the Chrysomelidae family, with more than 100 described species in three subgenera. The most widely known species is T. tenebricosa, the bloody-nosed beetle.All species are black, wingless organisms. Timarcha are herbivorous species, living mostly on plants belonging to Rubiaceae and Plumbaginaceae, although a few can feed on Brassicaceae and Rosaceae.