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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.

Mayfly Genus Cinygma (Western Light Cahills)

This uncommon Western genus is closely related to Cinygmula. It rarely provides good hatches.

Where & when

Time of year : April through September

Hatching behavior

These mayflies emerge in the surface flim.

Nymph biology

Current speed: Slow

Specimens of the Mayfly Genus Cinygma

2 Male Spinners
1 Female Spinner
1 Nymph

Recent Discussions of Cinygma

Cinygma mayflies
2 replies
Posted by Bnewell on Jul 15, 2011
Last reply on Jul 20, 2011 by Entoman
Perhaps one reason Cinygma mayflies do not create much interest for fishermen is because of their habit. They seem to prefer these small headwater streams, often streams without trout.

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Species in Cinygma
Cinygma dimickiWestern Light Cahill322
2 species (Cinygma integrum and Cinygma lyriforme) aren't included.
Genus Range
Common Name
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