Sand mounds on putting greens

We have noticed some small mounds of sand recently on the greens that appear different from any of our traditional turf pests. A little bit of investigation and it was determined that not only do I have filthy fingernails (which I did not realize how gross, until photographed close up...sorry), but that the mounds were made by a crop pest. The little beetle in the photo is the seed corn beetle, a common corn pest, who knew?
The mounds are cosmetic and the rules of golf allow for the brushing of the sand with a hat, towel, hand, or the like, provided that nothing is pressed down to improve the line of play.
The beetle is not exceeding any threshold that would require an insecticide application. It was just a cool find.
Ok, I'm a geek,
Turf