Ants (1977)

aka's: It Happened At Lakewood Manor/Ants!

An old-fashioned, lakeside hotel targeted for purchase by an unsavory gambling casino promoter and situated next to a construction site, is attacked by an army of poisonous ants. Efforts to contain the ants and rescue those trapped in the hotel are hampered by the progress of the creepy crawlers upward from floor to floor. Stars Robert Foxworth, Linda Day George, Bernie Casey, Brian Dennehy and Suzanne Sommers.