ALLIS, David born abt 1720 in MA or CT

I recently found some Allis' in my line and would like to know more.This is what I have
My connection starts with Mary Allis (born 17 May 1748 in Bolton, CT.) She was the daughter of David Allis and Sarah Pendall.Mary married Rueben Searl in 1764 and died enroute to Ohio in 1813.
Her father David was born abt 1720(I think) but I don't know whether it was Mass. or Conn. I show that his father was Nathaniel Allis and his mother was Mercy Dudley.Any additional information would be greatly appreciated.
Wanda Branson
bransons@hitter.net