|Dorsal and ventral view of the beetle playing dead|
Checking the family page for Dermestidae on BugGuide.net and Andreas Herrmann's excellent online resource for dermestid species I quickly got to the species A. sophonisba. Surprisingly, the attached author name Beal 1998 indicates that the species was only described 13 years ago. I have no access to distribution data other than Bugguide and some mentioning of the species when I google it. All point to western locations, mostly in California. It's amazing how many insect species are still being discovered and/or described every year in the Western United States.
However, this one is going into the freezer now. Being too small to be pinned, it will be glued to a point of archival paper. An insect pin will keep this point and the labels with the collection data together to make this carpet beetle a useful part of a research collection, unlike his feared, destructive brethren.