On Monday I went walking in Johnston Mill Nature Preserve along New Hope Creek. Right where the mill used to be I met a man and his son, later I ran into them and they told me they had seen 2 dragonflies emerging on rocks in the creek. So I went back to look for the newly emerged dragonflies, all that remained were the exuvias. Now my shoes were wet so I decided to look for my own emerging. It did not take long to find some emerging dragonflies. Turns out they were Eastern Least Clubtails - Stylogomphus albistylus, exactly what I'd hoped to find.