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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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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Insect Order Coleoptera (Beetles)

Lara (Elmidae) Riffle Beetle Larva from the South Fork Snoqualmie River in Washington
There are about 5,000 species of aquatic beetles, and I won't be including them all on this site. I've also only included certain aquatic beetles and terrestrial families which I've found frequently on trout streams.

The common terrestrial forms are especially important during the late summer when they get knocked into the stream in any number of ways. As far as I know there are no specific life cycle habits which toss these insects into the water in great numbers; they just become important because there are so many of them around incidentally.

Trout generally relish beetles and their imitations make great searching patterns.

Specimens of Beetles:

3 Adults
7 Larvae

1 Streamside Picture of Beetles:

1 Underwater Picture of Beetles:

Discussions of Coleoptera

Family
1 replies
Posted by DMM on Nov 26, 2006 in the family Hydrophilidae
Last reply on Nov 29, 2006 by Troutnut
I noticed the ending of the family is reversed--should be -ae.

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References

Insect Order Coleoptera (Beetles)

Taxonomy
26 families (Anthicidae, Carabidae, Chrysomelidae, Dryopidae, Dytiscidae, Georyssidae, Gyrinidae, Haliplidae, Heteroceridae, Hydraenidae, Hydroscaphidae, Hygrobiidae, Lampyridae, Limnichidae, Lutrochidae, Melyridae, Microsporidae, Noteridae, Ptiliidae, Ptilodactylidae, Salpingidae, Scirtidae, Staphylinidae, Staphylinidae, Tenebrionidae, and Torridinicolidae) aren't included.
Common Name
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