Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
This genus has not received any credit in angling books I've read, but entomologist Jason Robinson writes on the Troutnut forum that Agapetus is a common trout stream genus.
It is very easy for caddisflies to go unnoticed in the angling world, because they may be so easily mistaken for already well-known species by anglers with limited identification resources and tools.
Where & when
In 199 records from GBIF, adults of this genus have mostly been collected during June (29%), May (28%), July (18%), August (11%), and April (6%).
In 85 records from GBIF, this genus has been collected at elevations ranging from 69 to 20669 ft, with an average (median) of 2021 ft.