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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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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Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Bois Brule River in Wisconsin
Adirman
Adirman's profile picture
Monticello, NY

Posts: 479
Adirman on Sep 10, 2010September 10th, 2010, 3:15 am EDT
That Attenuata looks like it truly has the olive body, more so than any BWO pic i've seen yet! Wah tsize would that be tied in to imitate?

Thanks,

Adirman
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Sep 10, 2010September 10th, 2010, 4:31 am EDT
A-man,

The size of A. attenuata is usually around 6-7mm (or somewhere around a #16-18). However, this species is also notorious for creating confusion in fly-fishing literature and getting credit for being a more significant hatch than it probably is. I have some doubts that any of the mayflies pictured in the A. attenuata section are actually that species.
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Sep 10, 2010September 10th, 2010, 4:36 am EDT
Adirman-

The male dun and spinner would have a body length of ~6mm, which would translate to hook size #18, and the female would be slightly longer.

EDIT:

Lloyd,

Oh shoot, we've done it again.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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