Canada Darner - Aeshna canadensis (Walker, 1908)

This is a species of concern. Please report any encounters to Odonata Central.

Range & Habitat:
Found in North Jersey, primarily in the Ridge & Valley and Highland provinces.

May be found in feeding swarms away from water. Breeds in squishy ponds, small lakes and slow streams.

Flight Season:
Early Date: 27 June
Late Date: 13 October

Flight season charts created from records in the official database maintained by Allen Barlow.

Male Lateral - Photo by Jim Bangma
Click on a thumbnail to view full-size photo
Description:
Intermediate individuals must be ID'd by examination of the cerci under magnification. Many books tell you that you can feel small bumps on the cerci of Canada, but Green-striped cerci feel rough as well, although the bumps are smaller. Patrolling Canada Darners do not look as bright as Green-striped.
Very similar to Green-striped Darner. If the anterior lateral stripe is all blue, the ID is fairly straightforward, but in as many as 10% of New Jersey males, it is partially or completely green, similar to Green-striped. In Canada Darner, the notch in this stripe usually forms a 90° or sharper angle.

Canada usually shows a small spot between the lateral thoracic stripes, absent in Green-striped. Unfortunately, some male Canadas, usually the ones that most closely resemble Green-striped, lack this spot as well.

Intermediate individuals must be ID'd by examination of the cerci under magnification. Many books tell you that you can feel small bumps on the cerci of Canada, but Green-striped cerci feel rough as well, although the bumps are smaller.

Patrolling Canada Darners do not look as bright as Green-striped.


Conservation Status:
State: S2S3 Rare to imperiled in New Jersey
Global: G5 Secure globally, but possibly rare in parts of its range