Oops @Ganymede - you are right, I am wrong!It is a waterboatman
Try to catch it swimming. If it swims on its back, it is a lesser waterboatman, if on its front it is a greater waterboatman.
If it sinks will it be a submariner beetle?It is a waterboatman
Try to catch it swimming. If it swims on its back, it is a lesser waterboatman, if on its front it is a greater waterboatman.