+2
I am sure he may have seen some of these but here are a few suggestions to get you started...I am not too into this type of movie, but I have seen a few that might be really good if that is what you are into.
*The Silence of the Lambs (this was one of my favorite films as a child...I was a strange child).
*Arachnophobia
*The Fly
*The Mothman Prophecies (this may be stretching it a bit though as it does not focus on insects).
*Quartermass and the pit (science fiction, includes martian locusts)
*Python (never saw it myself, but it has snakes!)
*The Black Scorpion
*The Great Alligator
*The Horror of Party Beach
Hope some of these help you!