To the unaided eye, it just looked like a long, skinny beetle thing. Close up in the photo, it looks like a scary-mandibled termite-like alarming thing.
A day later: I happen to see a picture of a brown prionid, which looks identical except that mine has those spots. That at least tells me this thing is in the longhorned family somewhere...
Didn't come out well. And for some reason, it looks like it's dead in the picture. It was very much not dead. You aim where you think it will be.
I think it's a borer of some sort.
I'm stunned that this came out. They are runners, so you have to aim where you expect them to be in a moment.
Again a bit different from those I have shown before. Recall what JBS Haldane said about inordinate fondness.