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The Specimen

Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly Nymph View 7 PicturesThis Isonychia bicolor nymph from the Catskills displays the prominent white stripe sometimes characteristic of its species. This is the first such specimen I've photographed, because members of the same species in the Upper Midwest have a more subdued stripe (and were once thought to be a different species, Isonychia sadleri). The striking coloration on this eastern nymph is more appealing.
Collected April 19, 2006 from the Beaverkill River in New York
Added to Troutnut.com by on April 21, 2006

The Discussion

SareJanuary 28th, 2020, 7:11 pm
Posts: 2I just love your webpage and all the info you guys provide and the pics are incredible.
Please keep up the great work you are doing - no other webpage comes close to you guys.
Thanks Sare

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