Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Lone tree on a rock in the middle of Big Lake. Fittingly, Big Lake is the largest of several short wide spots in the upper Brule River.

From the Bois Brule River in Wisconsin

Stream photos

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

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.

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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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Identification: Mystacides

Mystacides sepulchralis (Black Dancer) Caddisfly Adult

3 Pictures

Lateral view of a Mystacides sepulchralis (Leptoceridae) (Black Dancer) Caddisfly Adult from the Bois Brule River in Wisconsin

I captured this small caddisfly from one of many dense mating swarms under overhanging alder trees in a slow stretch of the river. There were localized rises of trout under the swarms.

Collected July 28, 2004 from the Bois Brule River in Wisconsin

Added by Troutnut on January 25, 2006

Collected July 28, 2004 from the Bois Brule River in Wisconsin and added by Troutnut on January 25, 2006

Litobrancha
Knoxville TN

Posts: 51

Litobrancha on Sep 23, 2006September 23rd, 2006, 4:52 pm EDT

mystacides. note the folded tent like posterior portion of the wings.

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Sep 23, 2006September 23rd, 2006, 7:05 pm EDT

A "Black Dancer" for sure. LaFontaine says that the shiny black wing is indicative of sepulchralis. However, on the Lehigh River and Mud Run I have found shiny-winged specimens and dull-winged specimens in the same swarm. And sepulchralis is the only Mystacides species in the collecting record for Carbon and Monroe counties. Still, I'd say sepulchralis is a safe bet.

Troutnut