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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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Jim584th
Candia, NH

Posts: 4
Jim584th on Feb 20, 2010February 20th, 2010, 7:35 am EST
While fishing in Bristol, NH on February 18th, we saw four stoneflies walking on the sun side of small trees.
About 1/2 inches long, dark grey to black.Any ideas about patterns?
Jim
jim
Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Feb 20, 2010February 20th, 2010, 2:08 pm EST
Try a very simple black body, clear antron or zlon trude style wing, and black hackle.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
CharlieSawd
St. Michael, Minnesota

Posts: 26
CharlieSawd on Feb 20, 2010February 20th, 2010, 5:25 pm EST
This is a pattern I ripped off from a basic stimulator has been a very effective pattern here in the Driftless for little black stones.
/Users/Charlie/Desktop/dscn1400_vnf9-1.jpg

Thread: Black 8/0
Tail: Black goose biot
Body: Black straw, over tapered black dry fly dubbing
Body Hackle: Black
Rib: Fine black wire
Wing: Black CDC under grey antron
Thorax: Tapered black dry fly dubbing
Thorax Hackle: Grizzly
Antennae: Black microfiber
Charlie Sawdey
www.driftlessflybox.com
Jim584th
Candia, NH

Posts: 4
Jim584th on Feb 22, 2010February 22nd, 2010, 8:59 am EST
Thanks Guys,
I appreciate your help.
Jim
jim

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