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Pteronarcys californica

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

Mayfly Species Heptagenia solitaria (Gray Fox)

Where & when

Time of year : August through October

A few authors mention fishable hatches of these mayflies in the West, but they are not among the most important species.

Specimens of the Mayfly Species Heptagenia solitaria

1 Adult
Heptagenia solitaria (Gray Fox) Mayfly Adult
This species is common in the Flathead River below Kerr Day. The river here is fairly warm with a cobble and boulder bottom with heavy periphyton at times. This species is not common elsewhere in western Montana.
1 Male Spinner
1 Nymph

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Species Range
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