Anteos maerula, the angled sulphur or yellow angled-sulphur, is a butterfly of the family Pieridae. It is found from Peru to Mexico. Rarely, migrants can be found up to eastern Nebraska, south-eastern Arizona, south-western New Mexico, southern Texas, Mississippi and Florida. The wingspan is 82–117 mm. The upperside of the males is bright yellow, while females are paler. Both sexes have a black spot in the forewing cell. Adults feed on the nectar from red and purple flowers, including Hibiscus and Bougainvilla species. The larvae feed on Cassia species, including Cassia emarginata.