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Darner 908-2 - Aeshna canadensis

Darner 908-2 - Aeshna canadensis
Rochester, Monroe County, New York, USA
September 8, 2011
Green-striped? Canada?

The "flag" on the upper end of the first thoracic seems too tapered to be a Green-striped. Compare:


Follow-up question
Is that yellowish spot under the top stripe part of the ID process?

Not so much. While present on most Canadas
It seems to be quite changeable in Green-striped, based on images I can find of it (and there is no specific mention of it), so my guess would be no. The combination of the distinct shape of the first stripe, the absence of a dark stripe of the "frons" and the shape of the claspers in the male (and "feel" when in hand) are better, more reliable field marks. While the colur of the stripe (usually all green in Green-striped) is also a good indication, it is not fool-proof either. On average, I also find the Green Striped a frostier shade of blue and paler green than the Canada, but air temperature can mess around with that too.

It's supposedly always present on canadensis, but verticalis often shows it too, so it doesn't mean too much by itself. The shape of the stripes is more important.

Moved from ID Request.

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