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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

The East Fork Big Lost River in Idaho

Stream photos

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In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)
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In the Mayfly Genus Tricorythodes by Martinlf
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Sweltsa (Sallfly) Stonefly NymphSweltsa (Sallfly) Stonefly Nymph
Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
10 Recently Added Photos
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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Updates from May 24, 2005

Closeup insects by Bnewell from Flathead Lake in Montana

Female Callibaetis (Speckled Dun) Mayfly Dun
1 Picture
Female Callibaetis (Baetidae) (Speckled Dun) Mayfly Dun from Flathead Lake in Montana
Added by Bnewell on July 14, 2011
Collected May 24, 2005 from Flathead Lake in Montana and added by Bnewell on July 14, 2011
Female Callibaetis (Speckled Dun) Mayfly Dun
2 Pictures
Female Callibaetis (Baetidae) (Speckled Dun) Mayfly Dun from Flathead Lake in Montana
Probably Callibaetis ferrugineus.
Added by Bnewell on June 27, 2011
Collected May 24, 2005 from Flathead Lake in Montana and added by Bnewell on June 27, 2011
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Updates from May 17, 2005

Closeup insects by Bnewell from Teepee Creek in Montana

Megaleuctra stigmata (Little Black Needlefly) Stonefly Adult
3 Pictures
Megaleuctra stigmata (Leuctridae) (Little Black Needlefly) Stonefly Adult from Talking Water Creek in Montana
This is one of rarest stoneflies in western Montana. It is a bit unusual that it is fairly abundant in a handful of streams that empty into the east side of Flathead Lake. A very beautiful bug.
Added by Bnewell on June 28, 2011
Collected May 17, 2005 from Talking Water Creek in Montana and added by Bnewell on June 28, 2011
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Updates from May 13, 2005

Closeup insects by Bnewell from the Jocko River in Montana

Claassenia sabulosa (Golden Stone) Stonefly Nymph
2 Pictures
Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Nymph from the Jocko River in Montana
This is a stonefly that has recently molted and has not yet darkened.
Collected May 13, 2005 from the Jocko River in Montana
Added by Bnewell on June 28, 2011
Collected May 13, 2005 from the Jocko River in Montana and added by Bnewell on June 28, 2011
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Updates from May 11, 2005

Closeup insects by Bnewell from Hungry Horse Creek in Montana

3
Male Ameletus oregonensis (Brown Dun) Mayfly Spinner
Male Ameletus oregonensis (Ameletidae) (Brown Dun) Mayfly Spinner from Hungry Horse Creek in Montana
1
Rhithrogena Mayfly Nymph
Rhithrogena (Heptageniidae) Mayfly Nymph from Hungry Horse Creek in Montana
2
Drunella doddsii (Western Green Drake) Mayfly Nymph
Drunella doddsii (Ephemerellidae) (Western Green Drake) Mayfly Nymph from Hungry Horse Creek in Montana
1
Rhithrogena Mayfly Nymph
Rhithrogena (Heptageniidae) Mayfly Nymph from Hungry Horse Creek in Montana
Based on the lack of coloration and the two bars on the last tergite this may be Rhithrogena virilis.
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Updates from May 8, 2005

Closeup insects by Bnewell from the Jocko River, Yellow Bay Creek , Teepee Creek, and Flathead Lake in Montana

1
Male Skwala (Large Springfly) Stonefly Adult
Male Skwala (Perlodidae) (Large Springfly) Stonefly Adult from the Jocko River in Montana
2
Perlomyia utahensis (Little Black Needlefly) Stonefly Adult
Perlomyia utahensis (Leuctridae) (Little Black Needlefly) Stonefly Adult from Yellow Bay Creek in Montana
1
Kathroperla perdita (Sallfly) Stonefly Adult
Kathroperla perdita (Chloroperlidae) (Sallfly) Stonefly Adult from Teepee Creek in Montana
1
Paraperla wilsoni (Sallfly) Stonefly Adult
Paraperla wilsoni (Chloroperlidae) (Sallfly) Stonefly Adult from Flathead Lake in Montana
This is another stonefly that lives its nymphal life in the hyporheic zone, flood plain gravels. In this case, the gravels of a small stream, Roy's Creek, that flows into Flathead Lake at the Univ. of Montana Biological Station.
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