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.
"The Paraleptophlebia hatches are the seasonal Waterloo of most anglers, for without fine tippets and tiny flies an empty basket is assured."
In 191 records from GBIF, adults of this genus have mostly been collected during July (27%), June (25%), August (16%), May (12%), September (9%), and October (5%).
In 54 records from GBIF, this genus has been collected at elevations ranging from 3 to 9751 ft, with an average (median) of 896 ft.
Time of day: Weather dependant
Habitat: Soft margins
Current speed: Moderate to fast
Substrate: Sand, gravel, detritus