Gray Petaltails are very localized and somewhat uncommon dragonflies. They live near forest seeps. Cedar Bog near Urbana is a good place to see them, and there is also a good population at Germantown MetroPark. I usually see Gray Petaltails in late May and June. 

I found this Gray Petaltail in the Edge of Appalachia nature preserve (Adams County, Ohio) on July 3, 2016. Notice how wide apart his eyes are. The only other dragonflies in Ohio with widely-spaced eyes are members of the clubtail family. All other dragonflies in Ohio have eyes that meet at a point or seam. 

Gray Petaltails are gentle giants. They often land on people but are completely harmless. The individual at left was photographed at Germantown MetroPark. He was hanging out on a fence rail in a parking lot, untroubled by the presence of people and cars.  

Another Gray Petaltail at Germantown MetroPark. They will hang out all day on a nice sunny fence, just like Snoopy on his doghouse. 

Gray Petaltails have a habit of perching flat against tree trunks. They are fairly well camouflaged on the tree bark, despite their large size.