What's That Bug? does not endorse extermination

Subject: Strange bug
Location: Maine USA
May 28, 2016 7:00 am
My friend took pictures of these bugs and we cannot figure out what they are.
Signature: Emil Falkenberry

Stonefly Exuvia

Stonefly Exuvia

Dear Emil,
These are the Exuviae or cast off exoskeletons of aquatic nymphs of Stoneflies, known as a naiads, so we are guessing these images were taken close to a stream or river.  Of the Stonefly family, BugGuide notes:  ”
nymphs occur primarily under stones in cool unpolluted streams; some species occur along rocky shores of cold lakes, in cracks of submerged logs, and debris that accumulates around stones, branches, and water diversion grills.  spring and summer adults may be found resting on stones and logs in the water, or on leaves and trunks of trees and shrubs near water; winter stoneflies are often attracted to concrete bridges over streams, and some species are commonly found on snow or resting on fence posts during the warmer days of late winter.”  Though we cannot be certain of the species, your images resemble the Exuviae of the Beautiful Stone, 
Paragnetina immarginata, which is pictured on BugGuide.  Since one of your images appears to be up-side-down, we are guessing they may have been taken on a bridge overhang.

Stonefly Exuviae

Stonefly Exuviae

Thank you so much and yes they were under a bridge by water.  🙂  Have a great weekend.

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What's That Bug? does not endorse extermination
Location: Maine

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