From searching on your site I believe the bugs I saw last week on Mt. Tamalpais, here in Marin County are springtails. They were clustered in a band about a foot wide in a circle about 8 feet in diameter. I took a short video clip that shows them springing about. If you can confirm the ID I’d appreciate it. Thank you,
You are absolutely correct. These are Springtails. We are not sure what family, genus or species however.