Sephisa princeps is a butterfly of the Nymphalidae family. It was described by Fixsen in 1887. It is found in the Russian Far East (Amur, Ussuri), north-eastern China and Korea. The habitat consists of oak forests. Adults are on wing from July to August. Females occurring in tree crowns while males, usually solitary, often on puddles. The female lays eggs in a convolute leaf by some dozens at a time. The larvae feed on Quercus mongolica. Larvae of first two instars live gregariously. There are a total of five instars. The pupation takes place in a pupa hanging on the leaf petiole.