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Male Maccaffertium vicarium (March Brown) Mayfly Dun Pictures

 This is the only Heptageniid mayfly I saw hatch on May 24, 2004, and luckily it floated right by me.

Edit: Gonzo confirmed most likely vicarium 06.21.12


This mayfly was collected from the Namekagon River on May 24th, 2004 and added to Troutnut.com on January 25th, 2006.


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