So after reviewing last night's dream I decided to google to see if beetles do, indeed, swarm.
They do, depending on breed and environmental circumstances.
Also, the 2 inch black beetles exist...I looked at pictures of beetles until I found the ones in my dream. Here is a link to an article about them.
https://www.pinalcentral.com/homeandhearth/are-those-big-black-prehistoric-looking-bugs-dangerous/article_1cf4e60b-54c1-550d-b955-b5deb22ab2f2.html
Cool.