Hard-shelled Flying Tiny Black Beetle?

I live in Miami, Florida. When you open the door, these 1/2 inch or less long black hard shelled beetle like bugs fly in. I will be sitting and feel something crawling on my bare arm and it itches. I pick them off. Sometimes they will just be crawling on the computer desk or flittering nearby. When I smash them, they crumble (no juice lol) into teeny-tiny black pepper grain-like crumbs.

I looked at the bug id link provided in an earlier post, but could not find this. Thank you :)

By Gail Lynn B.