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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This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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Mayfly Genus Heterocloeon (Tiny Blue-Winged Olives)
Heterocloeon is one of two genera along with Acentrella that can be differentiated from other baetids by the presence of a conical mesonotal projection. All but one species of this genus can be further separated from Acentrella by the lack of venation in the tiny hindwings. There is little evidence that the species of Heterocloeon are of much significance to anglers.
Genus Range
Start a Discussion of Heterocloeon
Mayfly Genus Heterocloeon (Tiny Blue-Winged Olives)
Taxonomy
8 species (Heterocloeon anoki, Heterocloeon berneri, Heterocloeon berneri, Heterocloeon davidi, Heterocloeon grande, Heterocloeon petersi, Heterocloeon petersi, and Heterocloeon rubrolaterale) aren't included.