Swamp darner or Epiaeschna heros
This is the swamp darner or Epiaeschna heros. If you live west of central Texas, you’re not seeing this one in your swarms! Anywhere else, this is a darner commonly found in swarms. Things to look for: Very large dragonfly, up to 3.5 inches long. Dark brown body with narrow, bright green stripes on abdomen, thick green strips on sides of thorax. Bright blue eyes. Males and females similar, though female may lose some of the blue as she ages. This dragonfly is found only east of Ohio in the north and east of Nebraska and Texas further south.
That’s it for the common migratory darners! Most of the time, if you’re seeing what you think are very large dragonflies in a swarm, it will be one of the two species above. Most of the Libellulidae (also known as skimmers) are smaller than the darners, though they’re still pretty big. Most of the migratory skimmers are also very common species of dragonflies with wide ranges in the U.S.. These include this gorgeous skimmer.
(source:google/http://thedragonflywoman.com/)
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