Colias dimera, the dimera sulphur, is a butterfly in the Pieridae family. It is found in the Tropical Andes subregion of the Neotropical ecozone (Venezuela, Colombia, Peru, and Ecuador). The species was first discovered in Colombia. It is the most abundant butterfly in the interior of Ecuador. The wingspan is 35–40 mm (1.4–1.6 in). There are two female forms: one is similar to the males, while the other is yellowish/greenish white.