Multicolored Asian Ladybug (Harmonia axyridis). Harmonia axyridis, most commonly known as the Harlequin, Halloween, or multicolored Asian ladybug, is a large coccinellid beetle. This is one of the most variable species in the world, with an exceptionally wide range of color forms. These ladybugs are voracious predators, and serve as a biocontrol agent for aphids and scale insects.