I was outside under a tree and had two on my top. The are small maybe about the size of a small ant and easy to smash and kill. I didn't notice any bites. I found another oone today on a shirt. Please help.

I'd have to see a pic of it, or much more detailed description. You could take it to local Ag Dept or university

We could probably have a better shot at identifying it if we knew what area you live in and had an actual description of the bug.