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.
In 4 records from GBIF, adults of this genus have been collected during June (50%) and April (50%).
To determine whether a specimen of Rhyacophilidae belongs to Himalopsyche, use the Key to Genera of Rhyacophilidae Adults.