 Female beetles can change colour but not as completely as males, which is not yet explained as the mechanisms for the colour change is still not completely understood.What is known is that changes in humidity affect the levels of moisture in the cuticle which leads to a change in colour in most cases.Since the change is due to humidity it is a reversible process, however, it has been observed that after multiple colour changes or high stress the beetles will maintain some dark spots on their cuticle.