[header] How to catch small bugs [title] Look under rocks and logs to uncover small insects of every kind. [step] Bugs love dark, humid spots. Head to the nearest stream, or simply start turning over rotting logs, rocks, and other low-lying hiding spots. 
You can catch a large variety of insects this way as long as you're quick. In damp, loose soil, just dig 6-8 " under the surface to reveal a plethora of insects.