Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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Millcreek on Feb 21, 2018February 21st, 2018, 6:50 am EST
I've had the Isoperla species in here before but it was dead when photographed and these are live. Species were identified to genus using "An Introduction to the Aquatic Insects of North America" by Merritt, Cummins and Berg (2008). They were identified to species using "The Isoperla of California (Plecoptera: Perlodidae) Larval Descriptions and a Key to 17 Western Nearctic Species" by J.B. Sandberg.(2011).
http://www2.pms-lj.si/illiesia/papers/Illiesia07-22.pdf
And "New Descriptions of North American Taenionema Larvae (Plecoptera; Taeniopterygidae)" by K.W. Stewart (2009).http://www.zobodat.at/pdf/Illiesia_05_0128-0145.pdf
The nymphs were collected 2/20/18 in shallow, fast water with small to medium gravel. The Isoperla marmorata was 13-15 mm and the Taenionema pacificum was 9-12 mm.
http://www2.pms-lj.si/illiesia/papers/Illiesia07-22.pdf
And "New Descriptions of North American Taenionema Larvae (Plecoptera; Taeniopterygidae)" by K.W. Stewart (2009).http://www.zobodat.at/pdf/Illiesia_05_0128-0145.pdf
The nymphs were collected 2/20/18 in shallow, fast water with small to medium gravel. The Isoperla marmorata was 13-15 mm and the Taenionema pacificum was 9-12 mm.
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