Oncopeltus varicolor, commonly known as the large milkweed bug, is a species of insect belonging to the family Lygaeidae. It is characterized by its vibrant coloration, with a black body and red-orange markings on its wings. These bugs are commonly found on milkweed plants, as they feed on the seeds and sap. They are known for their distinctive mating behavior, where the male vibrates his wings to attract a female.