Chrysomya megacephala: Chrysomya megacephala, also known as Chrysomya rubra, belongs to Calliphoridae and Chrysomya. Huge body, bright green metallic luster, bright red compound eyes. There are no black longitudinal stripes on the chest and back, with less mane and more fine hair. Cheeks are orange. Distributed in southern Liaoning, North China, East China and South China. Chrysomya megacephala can be used as medicine, and mature and dry larvae can be used as medicine, which has the effects of clearing away heat and toxic materials, resolving food stagnation and eliminating addiction.