In the last part of October there were two days when swarms of beetles filled the air around the steel building on my property. One day was after two days of rain and the other day was after a day of strong winds. There were many configurations of spots on their backs as the following picture shows. I wonder which are beneficial and which might be detrimental to the plants that I am trying to grow.
In the second picture they appear to be searching for an entry to the building and as a place to hole-up for the Winter.
When one of the beetles is crushed, the aroma reminds me of the times when my mother was not happy about how they invaded the ceiling light fixtures and were roasted.