Near our house on the dog walking route, we have a wide patch of incredibly fine dust. It's so soft and light your tennis shoes sink in a few inches every step, and if you don't walk slowly and ducklike, your shoes fill with dirt immediately. We also have a healthy population of various beetly bugs. Here is a survey of some of their different tracks left during the night. These range from half an inch wide to about two inches wide. They are really quite fascinating in their diversity, density, and busyness.