While inspecting the frass-and-rotten-wood-packed rearing container in which I have dozens of Osmo*derma larvae, I noticed this white something-or-other that looked bigger than a mite or a springtail. Under magnification, I think it is a beetle larva. But what kind? Those antennae, or whatever grubs have for feelers/sensors in that location, are pretty phenomenal. It's got well developed legs and seems very alert.

I've put this little guy in his own jar. I think I'll put some springtails in there too since he looks like a hunter to me.

Presumably this creature came in the materials I collected at the windfall maple site that the Osmo*derma grubs came from. There was some kind of mammal nest atop the frass-packed Osmo*derma chamber.