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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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

5 Recently Added Photos

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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Stonefly Genus Allocapnia (Little Snowflies)

Allocapnia granulata is the most abundant Capniidae species in the East.

Where & when

In 615 records from GBIF, adults of this genus have mostly been collected during March (29%), February (26%), January (20%), December (11%), and April (10%).

In 82 records from GBIF, this genus has been collected at elevations ranging from 125 to 4856 ft, with an average (median) of 3182 ft.

Genus Range

source

Map of specific collection sites

Discussions of Allocapnia

Little Black Stonefly pics

12 replies

Posted by Adirman on Apr 14, 2018 in the species Allocapnia granulata

Last reply on Apr 21, 2018 by Martinlf

Hey guys, went out on the Neversink for awhile today and had a look around, saw a lot of little dark flies, may be the little black stone fly? Hard to tell cuz looked like Caddis too. Looks like about a size 16? Any pics of available of this species would be great.

Thanks

Start a Discussion of Allocapnia

References

Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.