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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 Species Paraleptophlebia bicornuta (Large Slate-Winged Mahogany Dun)

This important Western species is one of the few mayflies outside the Ephemeridae family to possess large tusks on the front of its head. It is also one of the largest species of Paraleptophlebia.

P. bicornuta is often reinforced by simultaneous hatches of the more common Paraleptophlebia debilis. The two duns appear virtually identical to the naked eye, though bicornuta usually has an edge in size.

Paraleptophlebia bicornuta is by far the widest distributed tusked species, though there are others. Telling the tusked species apart is very difficult and even entomological texts are largely ambiguous on the characters that differentiate them. Distribution records are probably the most reliable way for anglers to know with any probability what they are looking at. Check out the Paraleptophlebia packii and Paraleptophlebia helena hatch pages for more distribution information.

Where & when

Time of year : September through early November

Hatching behavior

Time of day : Morning and afternoon

Specimens of the Mayfly Species Paraleptophlebia bicornuta

1 Male Spinner
1 Female Spinner
2 Nymphs
1 Male Dun
Male Paraleptophlebia bicornuta (Large Slate-Winged Mahogany Dun) Mayfly Dun
You wonder sometimes how certain insects get their common names. This one is called the 'mahogany dun' for some unknown reason.

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References

Species Range
Resources
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