Found at lights on the 2nd night of the gathering, near the end of the road at Madera Canyon. That's not far from Florida Station, where the male ant below came to lights on the preceeding night.
From comparison to other BugGuide images (and help from Bob Carlson & friend), I'm thinking that both these are some species of Neivamyrmex
. The comments under the post below indicate that females of that genus are wingless, and males commonly come to lights.
While knowing that these were ants, Ken Wolgemuth referred to them
by the playfully descriptive common name..."sausage flies" :-) Although potentially misleading, in implying the wrong order, that's nevertheless a fun and memorable name!