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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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New Hampshire

Posts: 13
NEMatt on Jul 9, 2014July 9th, 2014, 10:12 pm EDT
Am I missing something here? I bought a new copy of Caucci and Nastasi's Hatches II and it's missing pages 189 to 220. These pages weren't torn out, they simply aren't there. Can't find anything online that suggests a printing error.

Has anyone else noticed this problem?
Johnvan61's profile picture

Posts: 9
Johnvan61 on Jul 10, 2014July 10th, 2014, 10:10 am EDT
No clue about that book but I do know some of the flies in Selective Trout's first edition,1987,no longer exist so they are not in the updated version, 2001. Maybe this also happened to Hatches II. I have read here a lot of the older names for mayflys are no longer used. Just a guess.---HTH---John
"my mind is like oatmeal"

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