What are these flies that were in my space bucket? First thought was fungus gnats, but the soil is bone dry (actually forgot to water yesterday).
There is nothing on the underside of the leaves either, so doesn't look like aphids.
Look like a fungus gnat. Even with dry soil they could be coming from somewhere else, otherwise it might be that their numbers are so far down that you're seeing a last adult...but even that 1 can start up a new population. By some "mosquitos bites) and water with that and it should kill any larvae starting up again.