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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Kogotus nonus (Smooth Springfly) Stonefly Nymph Pictures

Although 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.

Ventral view of a Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
Dorsal view of a Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
Ruler view of a Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington The smallest ruler marks are 1 mm.
Lateral view of a Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus nonus (Perlodidae) (Smooth Springfly) Stonefly Nymph from Mystery Creek #199 in Washington

This stonefly was collected from Mystery Creek #199 in Washington on July 28th, 2019 and added to Troutnut.com by Troutnut on July 30th, 2019.


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Kogotus nonus (Smooth Springfly) Stonefly Nymph Pictures

Collection details
Location: Mystery Creek #199, Washington
Date: July 28th, 2019
Added to site: July 30th, 2019
Author: Troutnut
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