Subject: Black beetles
Geographic location of the bug: Denver City , Texas
Time: 08:10 PM EDT
Your letter to the bugman: Hello!!! We have had an explosion of these beetles. Never seen them here before.
How you want your letter signed: Bugs aren’t scary
These appear to be Desert Stink Beetles in the genus Eleodes, possibly Eleodes fusiformis which is pictured on BugGuide. Desert Stink Beetles are sometimes called Acrobat Beetles or Circus Beetles because they have a habit of sticking their abdomens in the air when threatened, and they appear to be standing on their heads. The group image you submitted appears to document mating activity.