I collected this winged alate walking on a hiking trail at Big Bear CA on July 4th, 2015.
I initially thought she may be F. moki since there were so many in the area:
She would not settle and would not tear off her wings:
Then out of curiosity, I gave her some F. ravida and F. subpolita pupae which I collected to take pics of (along with their winged alates) and she immediately took to them and grabbed them all!
Then she ripped off her wings! Pretty cool. It was all done within a matter of minutes. So I'll keep a journal here and see where it goes. So it looks like she may be parasitic? The only parasitic Formica in this area are F. ravida I believe.
EDIT:
ID'ed as Formica aserva by James C. Trager
Edited by nurbs, July 8 2015 - 1:12 PM.