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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 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.
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 Lype diversa (Dark Eastern Woodland Sedges)

Where & when

Time of year : May through July

Preferred waters: Small woodland streams

This species is common in the Midwest and present throughout the East.

In 91 records from GBIF, adults of this species have mostly been collected during June (33%), May (22%), July (20%), and August (12%).

In 59 records from GBIF, this species has been collected at elevations ranging from 39 to 5103 ft, with an average (median) of 1881 ft.

Species Range

Egg-Laying behavior

Time of day: Afternoon or evening

Larva & pupa biology

Gary LaFontaine describes the unusual shelters built by these larvae in Caddisflies:

The larva builds a retreat, or dwelling tube, by raising a simple roof or a groove in a sunken piece of wood. The tube is camouflaged with pieces of detritus and a layer of silk.

Start a Discussion of Lype diversa


Caddisfly Species Lype diversa (Dark Eastern Woodland Sedges)

Species Range
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