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.

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Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington

This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.

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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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subnotatus?

Male Ameletus oregonensis (Brown Dun) Mayfly Spinner

3 Pictures

Male Ameletus oregonensis (Ameletidae) (Brown Dun) Mayfly Spinner from Hungry Horse Creek in Montana

Collected May 11, 2005 from Hungry Horse Creek in Montana

Added by Bnewell on June 28, 2011

Collected May 11, 2005 from Hungry Horse Creek in Montana and added by Bnewell on June 28, 2011

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Aug 25, 2011August 25th, 2011, 10:17 am EDT

Might this specimen have been mislabeled? It appears to be a better match for A. subnotatus than A. oregonensis. The adult key in Zloty (1996) distinguishes A. subnotatus by the dark margins on the crossveins ("giving them a speckled appearance and forming three or four larger dark patches") and dark suffusion only at the base of the hindwing (Fig. 44B). A. oregonensis is supposed to lack the dark margins on the crossveins and have dark suffusion at the base of both the forewings and the hindwings (Fig. 44A). Table 1 in Zloty and Pritchard (1997) seems to qualify this slightly and describes oregonensis females "with brown shadings around some cross-veins but without brown patches."

McCafferty and Newell (2008) contains this record: