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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.

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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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Caddisfly Species Micrasema bactro (Little Grannoms)

Where & when

Time of year : Late June

In 34 records from GBIF, adults of this species have mostly been collected during July (35%), August (32%), May (15%), and June (12%).

In 18 records from GBIF, this species has been collected at elevations ranging from 1650 to 8566 ft, with an average (median) of 4862 ft.

Species Range

Hatching behavior

Time of day : Evening


Start a Discussion of Micrasema bactro

References

Caddisfly Species Micrasema bactro (Little Grannoms)

Taxonomy
Species Range
Common Name
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