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Here is some Realistic Bug clip art - OK for commercial use!
There are 15 Insects ( and 1 arachnid) here, a total of 32 files - a white fill and a black outline for each insect.
The files themselves are 300 dpi png files. For each insect the longest dimension is 7" so these will work well in just about anything! Transparent PNGs so there are no white borders around the images.