Last night was cool with a rising wind, but the fireflies were still glorious.  It was interesting to observe them from the second story, looking out over the hayfield.  They tended to cluster around several of the younger trees, especially the persistently ill chestnut, to the point where you could see the outline of the tree when they flashed in sync.  This is not surprising.  The chestnut is always a buggy tree, at least judging by the worm-eating birds that flock to it.  However, they also clustered around the young ash, which also stands in the field on a fence-line.  A few had staked out the fence itself, a little string of stationary lights all at the same height.

They also drifted down out of the big magnolia and, to a lesser extent, the big hemlock.  Stars in the dark.