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| Male Widow Skimmer, Libellula luctuosa (top), Variable Dancer, Argia fumipennis violacea (bottom) |
Note the setae (hairs) on tibia of the dancer are twice the length of the spacing between - a characteristic of Agria species.
A link to a fantastic reference: http://homepage.mac.com/edlam/index.html
I also use the Photo Field Guide to the Dragon Flies and Damselflies of Southwestern Ontario (Second Edition) by Ian Carmicheal, Alister MacKenzie, and Brad Steinberg.
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