Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

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.

Inlet of Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Neoleptophlebia Mayfly Nymph Neoleptophlebia Mayfly Nymph

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington

Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.

10 Recently Added Photos

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

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Site updates from October 22, 2011

Closeup insects by Entoman from the Susquehanna River and the Fall River in Pennsylvania and California

Male Heptagenia culacantha Mayfly Spinner

1 Picture

Male Heptagenia culacantha (Heptageniidae) Mayfly Spinner from the Susquehanna River in Pennsylvania

This photo was provided by guide Eric Naguski along with the following comments, "I took this photo just upstream of Three Mile Island on the east shore of the Susquehanna River just below where the Swatara Creek enters. The Susquehanna is not an easy river to sample for bugs in my opinion. It is very large and pushes a lot of water. Especially in the spring when you would collect mature culacantha nymphs. And I don't believe that there are a ton of these Heptageniids around. Also the people who are doing most of the sampling like myself are doing so for water quality monitoring work so they only take the specimens down to genus-level taxonomy".

Collected October 21, 2011 from the Susquehanna River in Pennsylvania

Added by Entoman on February 9, 2012

Collected October 21, 2011 from the Susquehanna River in Pennsylvania and added by Entoman on February 9, 2012

Female Paraleptophlebia debilis (Mahogany Dun) Mayfly Dun

3 Pictures

Female Paraleptophlebia debilis (Leptophlebiidae) (Mahogany Dun) Mayfly Dun from the Fall River in California

Size: 9mm. These photos really highlight the brown pigmentation of the wing venation, but in the hand the wings look to be a uniform smokey gray. - Entoman

Collected October 21, 2011 from the Fall River in California

Added by Entoman on February 4, 2012

Collected October 21, 2011 from the Fall River in California and added by Entoman on February 4, 2012