A car and a pedestrian collided in New Milford on Wednesday evening, seriously injuring the pedestrian.  A 23-year-old was riding his skateboard down Route 109 when he collided with a northbound vehicle.  The skateboarder was taken to Danbury Hospital with serious injuries to his right leg.  The driver was uninjured and declined medical treatment at the scene.  The skateboarder was given a verbal warning for reckless use of a highway by a pedestrian.