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Pdcox has attached these 2 pictures to aid in identification. The message is below.
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PdcoxJuly 23rd, 2020, 1:17 pm
Kansas city

Posts: 12		Underside and topside of a nymph found at 8200' elevation, middle Colorado, small rolling creek. Note the red underbelly
TaxonJuly 23rd, 2020, 4:18 pm
Site Editor
Plano, TX

Posts: 1311		Hi Paul-

I believe this mayfly nymph to be of genus Rhithrogena.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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