The big-headed gold fly: the big-headed gold fly, also known as the red-headed gold fly, belongs to the family Lepidoptera and the genus Lepidoptera. The body is large, with bright green metallic luster and bright red compound eyes. The back of the thorax has no black longitudinal stripes, few bristles and many fine hairs. The cheeks are orange-yellow. Distributed in southern Liaoning and all over north, east and south China. The big head gold fly can be used medicinally, the old mature dry larvae into medicine, has the effect of clearing away heat and detoxification, eliminating the accumulation of addiction.