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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.

The "Fountain Flats" stretch of the Firehole was fishable in the morning after an uncharacteristically cold August night. From the Firehole River in Wyoming

Stream photos

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Female Skwala (Large Springfly) Stonefly AdultFemale Skwala (Large Springfly) Stonefly Adult
Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 in Washington
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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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Caddisfly Species Ptilostomis semifasciata (Giant Rusty Sedges)

This species is often found together with Ptilostomis ocellifera.

Where & when

Time of year : June and July

In 71 records from GBIF, adults of this species have mostly been collected during July (38%), June (37%), May (11%), and August (10%).

In 22 records from GBIF, this species has been collected at elevations ranging from 26 to 2133 ft, with an average (median) of 719 ft.

Species Range
Map of specific collection sites

Start a Discussion of Ptilostomis semifasciata

References

Caddisfly Species Ptilostomis semifasciata (Giant Rusty Sedges)

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Trichoptera (Caddisflies)
  5. » Family Phryganeidae
  6. » Genus Ptilostomis (Giant Rusty Sedges)
  7. » Species semifasciata (Giant Rusty Sedges)
Species Range
Map of specific collection sites
Common Name
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