Abstract: Leg regeneration was found in Eupolyphaga sinensis Walker. The characteristics of the regeneration were examined. The results showed that nymphs at all the instars had regeneration ability and legs amputated at any site could regenerate. Regenerated legs could be amputated and regenerate again. Tarsus of the regenerated leg was one segment less than the normal tarsus, which had five segments. If two femurs matched were amputated, the regenerated legs usually developed uncompleted, and one regenerated leg was larger than the other. Generally, the regenerated legs were in smaller size and lighter color. But the growth rate of the regenerated legs was faster. Legs amputated from femur and tarsus, if regeneration occurred, could grow back to the normal size after two rounds of ecdysis.

Key words: Eupolyphaga sinensis, amputation, regeneration, ecdysis