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For Insects, Spiders & Their Kin
For the United States & Canada
Perlid - Hesperoperla pacifica

Perlid - Hesperoperla pacifica
Bow River, Calgary, Alberta, Canada
April 6, 2009
Size: 29 mm w/ cerci
Collected from the river margin. Species identification would be appreciated as I don't have a key for stonefly species.

Moved from Hesperoperla.

Probably pacifica
As far as I know, the only other Nearctic species of this genus, H. hoguei, is only reported from California.

From Merritt and Cummins, there are only 2 species in the genus so it has to be pacifica.