He was investigating a dying flower that also had aphid-like creatures. I believe he might be a soldier from Camponotus yogi, but I don't know enough about ant identification to be sure.
The pair were sitting on a rock, started giving warning(?) calls when I came within 200 yards.
Flying north towards Russian Gulch
Seen perching on the same beam for about ten minutes at the protected inlet by Lucas Wharf restaurant.
Seen as a dominant shrub in the ridgeline coastal scrub habitat here.
This willow was presenting its upright catkins along with leaf bud eruption. The tree is about five meters high and a favorite perching place for a scrub jay in the neighborhood.