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.

Stream photos

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Male Baetidae (Blue-Winged Olive) Mayfly Dun Male Baetidae (Blue-Winged Olive) Mayfly Dun

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington

This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.

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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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Caddisfly Species Nectopsyche albida (White Millers)

This is the most prominent species of Nectopsyche in most northern states nationwide, and it earned the common name "White Miller" for the genus.

Because Nectopsyche albida is nocturnal, is a favorite of late-season night fishermen.

Where & when

Time of year : Late July to mid-August in the Upper Midwest

In 64 records from GBIF, adults of this species have mostly been collected during June (41%), July (17%), August (17%), May (11%), and September (6%).

In 15 records from GBIF, this species has been collected at elevations ranging from 466 to 4606 ft, with an average (median) of 1112 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Dusk or night

Egg-Laying behavior

Time of day: Dusk or night

Discussions of Nectopsyche albida

Moved from genus level to N. albida

Posted by Entoman on Jun 15, 2014

Last reply on Jun 15, 2014 by Entoman

It is my understanding that wing maculation is quite distinctive and consistent in this genus thus allowing species identification using this character. This specimen has been at the genus level for many years and somehow slipped through the cracks.;)

White Miller Bug

3 replies

Posted by MIKE54 on May 3, 2013

Last reply on May 4, 2013 by Adirman

Where did the name "White Miller" come from, for the caddis bug in the warm Yellowstone waters? I am not interested in the east coast mayfly with the same name. Thanks, Mike Miller.

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References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.