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Mayfly Species Paraleptophlebia debilis (Mahogany Dun)

Pictures Below
This widespread species can produce memorable hatches where it is locally abundant, especially in the West where it also tends to run larger in size. It loves the margins as is typical of most Leptophlebiidae species but has a greater tolerance for current. They are often found even in riffles. This is the most important species in the West.  

Where & When


Regions: East, Midwest, West

Time Of Year (?): July through October; peaks in September and October

Though they can begin to trickle off in the Summer, this species is most important in the Fall when its hatches concentrate. Added volume from other similar species of Paraleptophlebia can make these hatches of Mahogany Duns very important. When the hatch is at its greatest concentration, an added bonus is that there are often few competing insects on the water. It occurs across the continent and may be reinforced by Paraleptophlebia praepedita in the East or by one of several unusual tusk bearing species, Paraleptophlebia bicornuta, Paraleptophlebia packii and Paraleptophlebia helena in the West.

Hatching Behavior


Time Of Day (?): Midday

Water Temperature: 50-55F

Spinner Behavior


Time Of Day: Afternoon


Nymph Biology


Current Speed: Moderate

Leptophlebiidae species have a unique behavioral characteristic. They like to school and migrate to hatch sites like a little school of minnows. The angler fortunate enough to intercept them during this behavior can experience some fast and furious nymph fishing.

Pictures of 1 Mayfly Specimen in the Species Paraleptophlebia debilis:

Female Paraleptophlebia debilis (Mahogany Dun) Mayfly DunFemale Paraleptophlebia debilis (Mahogany Dun) Mayfly Dun View 3 PicturesSize: 9mm. These photos really highlight the brown pigmentation of the wing venation (Venation: The pattern in which the veins on the wings of an insect are arranged. It is usually one of the most useful identifying characteristics.), but in the hand the wings look to be a uniform smokey gray. - Entoman
Collected October 22, 2011 from the Fall River in California
Added to Troutnut.com by Entoman on February 4, 2012

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