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Stonefly Species Kogotus nonus

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Where & When


Region: West

Time Of Year (?): Summer

I found numerous mature nymphs and one flying adult of this species at the end of July in a small stream at 5,200 feet elevation in the Wenatchee Mountains of Washington.


Pictures of 3 Stonefly Specimens in the Species Kogotus nonus:

Kogotus nonus Stonefly NymphKogotus nonus Stonefly Nymph View 10 Pictures
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019
Female Kogotus nonus Stonefly AdultFemale Kogotus nonus Stonefly Adult View 18 Pictures
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019
Kogotus nonus Stonefly NymphKogotus nonus Stonefly Nymph View 9 PicturesAlthough Kogotus and Rickeri nymphs may be difficult or impossible to tell apart, I captured an adult Kogotus nonus specimen in the air on the same day as several of these nymphs, and they are likely the same species.
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019

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