Police in Kalamazoo say someone hit a motorcycle last night and then fled the scene.  It happened at around 9:30 on West Michigan.  Officers say someone pulled out of a bar parking lot and hit the passing motorcycle, knocking the two riders off.  The victims were taken to the hospital with minor injuries.  The car involved is described as a white Ford Taurus, which will have damage to the front bumper and passenger side headlight.  Officers say that while they were working the scene another car was driven through the police barricades and into the crash site, the driver of that car, a 22-year-old man, was chased down and arrested.