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.

Sunlight perfectly strikes the trees at a bend in the Foss River in the Washington Cascades.

From the Foss River in Washington

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

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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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Help With Identification

Redadman has attached this picture to aid in identification. The message is below.

Redadman
NEW YORK

Posts: 2

Redadman on Apr 23, 2020April 23rd, 2020, 10:24 pm EDT

This mayfly was observed in the Croton system yesterday. A size 14 maybe. My best guess is drunella cornuta based on photos from this site, but I'm stumped.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Apr 24, 2020April 24th, 2020, 12:28 am EDT

Hi Larry-

Welcome aboard. I believe this female subimago to be of genus Leptophlebia. If you lighten the image, the characteristic abdominal banding becomes more apparent.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Redadman
NEW YORK

Posts: 2

Redadman on Apr 24, 2020April 24th, 2020, 8:49 am EDT

Thanks for the quick response. Someone else thought it might be a hendrickson. I've fished this stream for years and never seen this exact coloration.

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on May 1, 2020May 1st, 2020, 1:20 pm EDT

A little early for drunella? The legs don't look right for drunella, either, I think. And I think the black quill typically has a very short middle tail. Could it be a hennie? What size was it? Oh and pretty photo, by the way. More to consider https://www.inaturalist.org/guide_taxa/35362

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell