may be ヤブヤンマ.
I found some interesting moths in this highway stop every time. And I found this dragonfly what I haven't found in Kobe, Onomichi, Sapporo.
I noticed there is a pond near the stop. I should see the pond next summer!
Arrhenodes minutus female, under bark on a dead but standing American Beech. Rock Creek Park, Washington, DC, USA.