A Blue-fronted Dancer, Argia apicalis. They nearly always perch on the ground, or rock, or something on or close to the substrate. The pale whitish-blue thorax looks as if it is armored in small plates that were welded together. Note how dancers hold their wings pressed together but elevated well above the abdomen; bluets hold them lower, with the abdomen between the wings.
One of my favorites and one of our most common dragonflies, the Blue Dasher, Pachydiplax longipennis. They often sit at the tips of exposed perches like tiny insectivorous Rough-legged Hawks, surveying their domain and dashing out to grab small insects or drive off other dragonflies. This one looks a bit like an old biplane in this pose, and he is obelisking; tilting his abdomen directly at the sun to minimize heat absorption.
Calico Pennants, Celithemis elisa, were especially obvious this day, the cherry-red males striking eye-catchers. Sometimes when shooting dragonfly photos, I use a large shutter aperture - low F-stop number - which blurs out the background, allowing the insect to stand out in sharper relief.
This is a female Calico Pennant. They are strongly sexually dimorphic - sexes look quite different - just like many species of birds.
I apologize for the rather shoddy photos of the golden-wings, but we couldn't get near them. They remained out by the water's edge and beyond where we could go, at least without some heavy wading. This and the shot above were taken with 12x zoom. Golden-winged Skimmer had only been documented in Ohio twice before, and both prior records were decades old. Hence, our excitement. This find is on a par with something like a Burrowing Owl appearing. Evidence is suggesting that dragonflies may be on a northward march as temperatures steadily warm, so perhaps finds of southerners like this species are going to become more commonplace.
Any day that is great for dragonflies will also produce lots of butterflies, and we had many species of skippers and butterflies, too. The above is a rather stunning species, Aphrodite Fritillary, Speyeria aphrodite. Which reminds me to put in a plug for the upcoming Appalachian Butterfly Conference. If you enjoy insects, you will have a great time at this event. Butterflies will be the primary focus, but we'll see plenty of dragonflies, and other goodies. Just visit THIS LINK for all the details.