According to Dragonflies and Damselflies of Algonquin Provincial Park and the Surrounding Area, Williamson's Emerald (Somatochlora williamsoni) is widespread but uncommon and it's a shame that this teneral male never had the opportunity to reproduce. The dragonfly was the victim of a collision with a vehicle and expired a few hours before these photos were taken; the beautiful, foil-like metallic yellows and greens have already begun to fade upon the death of the insect.
Williamson's Emerald is a fairly large dragonfly with a length of about 55 mm.
The are claspers are somewhat hairy and turn up at the tips, with a lateral spine visible along the outside edge when viewed from above.
