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.
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True Bug Family Nepidae (Water Scorpions)
Where & when
In 537 records from GBIF, adults of this family have mostly been collected during July (14%), June (13%), September (13%), August (12%), October (11%), April (10%), May (9%), March (6%), and November (6%).
In 18 records from GBIF, this family has been collected at elevations ranging from 59 to 5971 ft, with an average (median) of 777 ft.
Family Range
Specimens of Water Scorpions:
1 Adult
Here's a big water scorpion (no relation to actual scorpions). These guys are just about the most sinister-looking creatures you could find, and what's especially creepy is that they can come up out of the water and fly around, as I learned when one left my aquarium and buzzed my head while I was peeking into the microscope at a mayfly nymph.