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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Definition of 'Holarctic'
Definition of 'Holarctic'
Holarctic: The Holarctic is the biogeographic realm that includes most of the northern hemisphere, including both the Nearctic and Palearctic zoogeographic regions. The term "holarctic" is often used to describe northern species with circumpolar distributions spanning Europe, Asia, and North America.