What time of day did you catch the formica? I got up at 8 and then had already flow. Alates in the pool all flew off when brought out, and didn't find any while walking.
By the way, I think the ones that I posted about flying on the SF Bay area anter page is this species, it looks to have stubby golden hairs all over the body.
With all of us combined it was from 11AM to 11PM