Movie where killer ants in the desert?

You're probably thinking of "Phase IV" (1974). This sci-fi horror film features intelligent, mutant ants that have evolved in the Arizona desert and are rapidly taking over the landscape.

However, there are some other movies with killer ants in desert settings, though they might not be the first one that comes to mind:

* "The Naked Prey" (1965): This action-adventure film features a scene with ants swarming and attacking a character in a desert setting.

* "The Food of the Gods" (1976): While not strictly in the desert, this film features giant insects, including ants, terrorizing people in a rural area.

Let me know if you have any other details about the movie you're thinking of!