Ants (1977)

Construction workers anger a colony of ants, causing them to attack a nearby hotel. In a subplot, a rich jerk attempts to purchase the hotel from the old lady who has owned it forever.

When a young boy becomes covered by sticky, biting, deadly ants after doing some dumpster diving, a doctor declares that he died from a virus. The construction foreman Mr. Carr insists that the ants killed him, but the arrogant doc won't even consider that suggestion as he knows more than someone who works with heavy machinery.

Whenever ants swarm onto someone, they scream for help and fall flat rather than making an attempt to brush off the ants. It's really annoying. Later in the movie, one of the construction workers who gets ants on him screams that his leg has gone numb. It would have been helpful to explain earlier in the film that the ants had a numbing effect on people as it would make it much less irritating when people do nothing to save themselves.

Oddly enough, no one notices the massive swarms of ants advancing on the hotel, leading to the climax when the guests - including a lady in a wheelchair and a girl who gets dizzy from heights - get trapped in the hotel by the big freaking mass of attacking ants.