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.
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Light Cahill Spinners
Like most common names,"Light Cahill Spinner" can refer to more than one taxon. They're previewed below, along with 6 specimens. For more detail click through to the scientific names.
Mayfly Genus Stenacron
These are sometimes called Light Cahill Spinners.
The species in this genus were formerly classified in Stenonema. See the genus Maccaffertium for details. Only one species, Stenacron interpunctatum, is important to fly fishermen. See its page for details.
See 5 more specimens...
Mayfly Species Stenonema ithaca
These are sometimes called Light Cahill Spinners.
This female looks very much like a male I collected a few hundred miles away a few days later, so I'm guessing it's the same species, which I believe is Maccaffertium mediopunctatum.
This specimen seems to be of the same species as a dun I photographed which emerged from another nymph in the same sample.
See 2 more specimens...
Mayfly Species Cinygma dimicki
These are very rarely called Light Cahill Spinners.
I found a couple small (one or two dozen flies) clouds of these male spinners dancing low over the riffly parts of a pool in this fast river draining out of the Cascades.
See 2 more specimens...