Color movie seen on TV in early 1980s.  Group of teens walk thru woods with reptiles made to look like dinosaurs,  and demons (warded of if they wore a necklace with occult symbol).  One makes it out with a flying devil that warns he will die in one year.  As he gets onto a road to escape a car without a driver hits him.  Movie ends with him in a pyschiatric hospital screaming its been one year and they are coming to get him.  Last scene shoes one of the groups teens, possessed, entering the hospital.