They are entirely different insects, and only water scorpions fly out of the water and are attracted to lights. Water bugs on the other hand do not fly ,and are entirely aquatic.
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.
I've also found that the two thieves were leaving for Algeria, thanks of a trace of DNA evidence recovered from a helmet and their past in burglary cases according to the police.