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Photo#586736
Mosaic darner dragonfly - Aeshna constricta - male

Mosaic darner dragonfly - Aeshna constricta - Male
Milton, Rock County, Wisconsin, USA
July 12, 2009
Side view of a male mosaic darner dragonfly. Based on the apparent straight leading edge of the anterior thoracic side stripe and the wedge-type claspers, I believe this is most likely a shadow darner (Aeshna umbrosa) despite the apparent absence of a black border of the thoracic side stripes. A lance-tipped darner (Aeshna constricta) would be a possibility if I have misinterpreted the shape of the side stripe. No dorsal view is available.

Moved
Moved from ID Request.

Lance-tipped
This is a male Lance-tipped Darner (Aeshna constricta).

 
ID criteria?
Thanks for your input. Could tell me what criteria you used to differentiate this from a shadow darner? See my comments in my original post. The leading edge of the anterior thoracic stripe looks straight to me.

 
Shape
The anterior lateral thoracic stripe of umbrosa is shaped like the Arabic numeral 7, with a conspicuous, hooked posterior flag. The posterior flag of constricta is much smaller. Additionally, umbrosa is much darker, with reduced abdominal spots. This individual is teneral and possibly cold (many species darken when cooled), so this also affects the brightness (and perceived shape) of the stripes. Hope this helps.

 
Thoracic stripes
Excellent!! Thank your for the lucid explanation.

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