I was standing in my yard when I saw what I thought was a large greenbottle fly (or a wasp) buzzing about low over some pine straw mulch. It suddenly dove into the mulch and disappeared. This reminded me very much of the behavior of a Euphoria. I dug it out, and it played dead in a very convincing fashion. I kept it captive for a couple of days and finally was able to photograph it in an active pose. (That took waiting over the beetle, still, for about 30 minutes!) I later released the beetle in my yard. It flew off into the distance, rather in a huff, I imagine.

I don't know what this behavior of suddenly diving into the litter is--perhaps it is characteristic of a female about to oviposit, or perhaps it is behavior of a male looking for freshly-emerged females. (See comments below.)

Photographing this species is a challenge--the surface is like a green mirror.