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Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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Stonefly Genus Sweltsa (Sallfly)

Only Sweltsa coloradensis has been specifically mentioned as a common species in my sources.

Where & when

In 140 records from GBIF, adults of this genus have mostly been collected during June (32%), May (29%), July (14%), April (12%), and March (11%).

In 70 records from GBIF, this genus has been collected at elevations ranging from 330 to 11201 ft, with an average (median) of 8999 ft.

Genus Range

Specimens of the Stonefly Genus Sweltsa

2 Female Adults
6 Adults
5 Nymphs

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Stonefly Genus Sweltsa (Sallfly)

Genus Range
Common Name
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