A 30-year-old woman motorcycle rider is being treated for serious head injuries following a crash tonight.A Police spokesman said the single-vehicle accident on North Shore Road, Devonshire was reported at 6.15pm.The rider appeared to have lost control a short distance West of Barker's Hill.A scooter lay by the roadside at the entrance to a water extraction plant in the area, and a helmet on the verge across the road.Police are appealing for witnesses to contact the Road Policing Unit at 295-0011.