Bug (1975)
Last film of gimmick director William Castle (The Tingler, House on Haunted Hill) about a scientist who creates a breed of intelligent, flying super-roaches.
Did I mention these roaches can produce fire and prey upon unsuspecting users of rotary phones?
http://horrorfanzine.com/wp-content/uploads/2011/03/bug-1975-08.jpg
If you liked Kingdom of the Spiders you'll love another movie starring a brooding 70s character actor being driven mad by bugs who can spell.
http://www.mississippientomologicalmuseum.org.msstate.edu/images/Anthropo_ent/Movies/Bug_c.059.jpg
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Brandon Blackmoor commented
This was based on a rather interesting novel. Oddly enough, I read the novel first, and was surprised when it was being made into a movie. It's actually a pretty decent adaptation, but in my opinion it should have been two movies.