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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.

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.
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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Taxon
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Plano, TX

Posts: 1311
Taxon on Oct 6, 2009October 6th, 2009, 7:18 pm EDT
These Predaceous Diving Beetle adults were collected in a kick-net sample from a W. WA foothills river. Although adults, they are barely more than 2mm in length, and have really incredible swimming speed for their size. Although they have been identified to genera as Oreodytes, I am hoping a Dytiscid expert will see this post, and be identify them to species.






Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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